#include "builtin.h"
#include "perf.h"
#include "perf-sys.h"
#include "util/cpumap.h"
#include "util/evlist.h"
#include "util/evsel.h"
#include "util/evsel_fprintf.h"
#include "util/mutex.h"
#include "util/symbol.h"
#include "util/thread.h"
#include "util/header.h"
#include "util/session.h"
#include "util/tool.h"
#include "util/cloexec.h"
#include "util/thread_map.h"
#include "util/color.h"
#include "util/stat.h"
#include "util/string2.h"
#include "util/callchain.h"
#include "util/time-utils.h"
#include <subcmd/pager.h>
#include <subcmd/parse-options.h>
#include "util/trace-event.h"
#include "util/debug.h"
#include "util/event.h"
#include "util/util.h"
#include "util/synthetic-events.h"
#include "util/target.h"
#include <linux/kernel.h>
#include <linux/log2.h>
#include <linux/zalloc.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <inttypes.h>
#include <errno.h>
#include <semaphore.h>
#include <pthread.h>
#include <math.h>
#include <api/fs/fs.h>
#include <perf/cpumap.h>
#include <linux/time64.h>
#include <linux/err.h>
#include <linux/ctype.h>
#define PR_SET_NAME 15
#define MAX_CPUS 4096
#define COMM_LEN 20
#define SYM_LEN 129
#define MAX_PID 1024000
#define MAX_PRIO 140
#define SEP_LEN 100
static const char *cpu_list;
static struct perf_cpu_map *user_requested_cpus;
static DECLARE_BITMAP(cpu_bitmap, MAX_NR_CPUS);
struct sched_atom;
struct task_desc {
unsigned long nr;
unsigned long pid;
char comm[COMM_LEN];
unsigned long nr_events;
unsigned long curr_event;
struct sched_atom **atoms;
pthread_t thread;
sem_t ready_for_work;
sem_t work_done_sem;
u64 cpu_usage;
};
enum sched_event_type {
SCHED_EVENT_RUN,
SCHED_EVENT_SLEEP,
SCHED_EVENT_WAKEUP,
};
struct sched_atom {
enum sched_event_type type;
u64 timestamp;
u64 duration;
unsigned long nr;
sem_t *wait_sem;
struct task_desc *wakee;
};
enum thread_state {
THREAD_SLEEPING = 0,
THREAD_WAIT_CPU,
THREAD_SCHED_IN,
THREAD_IGNORE
};
struct work_atom {
struct list_head list;
enum thread_state state;
u64 sched_out_time;
u64 wake_up_time;
u64 sched_in_time;
u64 runtime;
};
struct work_atoms {
struct list_head work_list;
struct thread *thread;
struct rb_node node;
u64 max_lat;
u64 max_lat_start;
u64 max_lat_end;
u64 total_lat;
u64 nb_atoms;
u64 total_runtime;
int num_merged;
};
typedef int (*sort_fn_t)(struct work_atoms *, struct work_atoms *);
struct perf_sched;
struct trace_sched_handler {
int (*switch_event)(struct perf_sched *sched, struct evsel *evsel,
struct perf_sample *sample, struct machine *machine);
int (*runtime_event)(struct perf_sched *sched, struct evsel *evsel,
struct perf_sample *sample, struct machine *machine);
int (*wakeup_event)(struct perf_sched *sched, struct evsel *evsel,
struct perf_sample *sample, struct machine *machine);
int (*fork_event)(struct perf_sched *sched, union perf_event *event,
struct machine *machine);
int (*migrate_task_event)(struct perf_sched *sched,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine);
};
#define COLOR_PIDS PERF_COLOR_BLUE
#define COLOR_CPUS PERF_COLOR_BG_RED
struct perf_sched_map {
DECLARE_BITMAP(comp_cpus_mask, MAX_CPUS);
struct perf_cpu *comp_cpus;
bool comp;
struct perf_thread_map *color_pids;
const char *color_pids_str;
struct perf_cpu_map *color_cpus;
const char *color_cpus_str;
const char *task_name;
struct strlist *task_names;
bool fuzzy;
struct perf_cpu_map *cpus;
const char *cpus_str;
};
struct perf_sched {
struct perf_tool tool;
const char *sort_order;
unsigned long nr_tasks;
struct task_desc **pid_to_task;
struct task_desc **tasks;
const struct trace_sched_handler *tp_handler;
struct mutex start_work_mutex;
struct mutex work_done_wait_mutex;
int profile_cpu;
struct perf_cpu max_cpu;
u32 *curr_pid;
struct thread **curr_thread;
struct thread **curr_out_thread;
char next_shortname1;
char next_shortname2;
unsigned int replay_repeat;
unsigned long nr_run_events;
unsigned long nr_sleep_events;
unsigned long nr_wakeup_events;
unsigned long nr_sleep_corrections;
unsigned long nr_run_events_optimized;
unsigned long targetless_wakeups;
unsigned long multitarget_wakeups;
unsigned long nr_runs;
unsigned long nr_timestamps;
unsigned long nr_unordered_timestamps;
unsigned long nr_context_switch_bugs;
unsigned long nr_events;
unsigned long nr_lost_chunks;
unsigned long nr_lost_events;
u64 run_measurement_overhead;
u64 sleep_measurement_overhead;
u64 start_time;
u64 cpu_usage;
u64 runavg_cpu_usage;
u64 parent_cpu_usage;
u64 runavg_parent_cpu_usage;
u64 sum_runtime;
u64 sum_fluct;
u64 run_avg;
u64 all_runtime;
u64 all_count;
u64 *cpu_last_switched;
struct rb_root_cached atom_root, sorted_atom_root, merged_atom_root;
struct list_head sort_list, cmp_pid;
bool force;
bool skip_merge;
struct perf_sched_map map;
bool summary;
bool summary_only;
bool idle_hist;
bool show_callchain;
unsigned int max_stack;
bool show_cpu_visual;
bool show_wakeups;
bool show_next;
bool show_migrations;
bool pre_migrations;
bool show_state;
bool show_prio;
u64 skipped_samples;
const char *time_str;
struct perf_time_interval ptime;
struct perf_time_interval hist_time;
volatile bool thread_funcs_exit;
const char *prio_str;
DECLARE_BITMAP(prio_bitmap, MAX_PRIO);
struct perf_session *session;
struct perf_data *data;
};
struct thread_runtime {
u64 last_time;
u64 dt_run;
u64 dt_sleep;
u64 dt_iowait;
u64 dt_preempt;
u64 dt_delay;
u64 dt_pre_mig;
u64 ready_to_run;
u64 migrated;
struct stats run_stats;
u64 total_run_time;
u64 total_sleep_time;
u64 total_iowait_time;
u64 total_preempt_time;
u64 total_delay_time;
u64 total_pre_mig_time;
char last_state;
char shortname[3];
bool comm_changed;
u64 migrations;
int prio;
};
struct evsel_runtime {
u64 *last_time;
u32 ncpu;
};
struct idle_thread_runtime {
struct thread_runtime tr;
struct thread *last_thread;
struct rb_root_cached sorted_root;
struct callchain_root callchain;
struct callchain_cursor cursor;
};
static struct thread **idle_threads;
static int idle_max_cpu;
static char idle_comm[] = "<idle>";
static u64 get_nsecs(void)
{
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return ts.tv_sec * NSEC_PER_SEC + ts.tv_nsec;
}
static void burn_nsecs(struct perf_sched *sched, u64 nsecs)
{
u64 T0 = get_nsecs(), T1;
do {
T1 = get_nsecs();
} while (T1 + sched->run_measurement_overhead < T0 + nsecs);
}
static void sleep_nsecs(u64 nsecs)
{
struct timespec ts;
ts.tv_nsec = nsecs % 999999999;
ts.tv_sec = nsecs / 999999999;
nanosleep(&ts, NULL);
}
static void calibrate_run_measurement_overhead(struct perf_sched *sched)
{
u64 T0, T1, delta, min_delta = NSEC_PER_SEC;
int i;
for (i = 0; i < 10; i++) {
T0 = get_nsecs();
burn_nsecs(sched, 0);
T1 = get_nsecs();
delta = T1-T0;
min_delta = min(min_delta, delta);
}
sched->run_measurement_overhead = min_delta;
printf("run measurement overhead: %" PRIu64 " nsecs\n", min_delta);
}
static void calibrate_sleep_measurement_overhead(struct perf_sched *sched)
{
u64 T0, T1, delta, min_delta = NSEC_PER_SEC;
int i;
for (i = 0; i < 10; i++) {
T0 = get_nsecs();
sleep_nsecs(10000);
T1 = get_nsecs();
delta = T1-T0;
min_delta = min(min_delta, delta);
}
min_delta -= 10000;
sched->sleep_measurement_overhead = min_delta;
printf("sleep measurement overhead: %" PRIu64 " nsecs\n", min_delta);
}
static struct sched_atom *
get_new_event(struct task_desc *task, u64 timestamp)
{
struct sched_atom *event = zalloc(sizeof(*event));
unsigned long idx = task->nr_events;
size_t size;
event->timestamp = timestamp;
event->nr = idx;
task->nr_events++;
size = sizeof(struct sched_atom *) * task->nr_events;
task->atoms = realloc(task->atoms, size);
BUG_ON(!task->atoms);
task->atoms[idx] = event;
return event;
}
static struct sched_atom *last_event(struct task_desc *task)
{
if (!task->nr_events)
return NULL;
return task->atoms[task->nr_events - 1];
}
static void add_sched_event_run(struct perf_sched *sched, struct task_desc *task,
u64 timestamp, u64 duration)
{
struct sched_atom *event, *curr_event = last_event(task);
if (curr_event && curr_event->type == SCHED_EVENT_RUN) {
sched->nr_run_events_optimized++;
curr_event->duration += duration;
return;
}
event = get_new_event(task, timestamp);
event->type = SCHED_EVENT_RUN;
event->duration = duration;
sched->nr_run_events++;
}
static void add_sched_event_wakeup(struct perf_sched *sched, struct task_desc *task,
u64 timestamp, struct task_desc *wakee)
{
struct sched_atom *event, *wakee_event;
event = get_new_event(task, timestamp);
event->type = SCHED_EVENT_WAKEUP;
event->wakee = wakee;
wakee_event = last_event(wakee);
if (!wakee_event || wakee_event->type != SCHED_EVENT_SLEEP) {
sched->targetless_wakeups++;
return;
}
if (wakee_event->wait_sem) {
sched->multitarget_wakeups++;
return;
}
wakee_event->wait_sem = zalloc(sizeof(*wakee_event->wait_sem));
sem_init(wakee_event->wait_sem, 0, 0);
event->wait_sem = wakee_event->wait_sem;
sched->nr_wakeup_events++;
}
static void add_sched_event_sleep(struct perf_sched *sched, struct task_desc *task,
u64 timestamp)
{
struct sched_atom *event = get_new_event(task, timestamp);
event->type = SCHED_EVENT_SLEEP;
sched->nr_sleep_events++;
}
static struct task_desc *register_pid(struct perf_sched *sched,
unsigned long pid, const char *comm)
{
struct task_desc *task;
static int pid_max;
if (sched->pid_to_task == NULL) {
if (sysctl__read_int("kernel/pid_max", &pid_max) < 0)
pid_max = MAX_PID;
BUG_ON((sched->pid_to_task = calloc(pid_max, sizeof(struct task_desc *))) == NULL);
}
if (pid >= (unsigned long)pid_max) {
BUG_ON((sched->pid_to_task = realloc(sched->pid_to_task, (pid + 1) *
sizeof(struct task_desc *))) == NULL);
while (pid >= (unsigned long)pid_max)
sched->pid_to_task[pid_max++] = NULL;
}
task = sched->pid_to_task[pid];
if (task)
return task;
task = zalloc(sizeof(*task));
task->pid = pid;
task->nr = sched->nr_tasks;
strcpy(task->comm, comm);
add_sched_event_sleep(sched, task, 0);
sched->pid_to_task[pid] = task;
sched->nr_tasks++;
sched->tasks = realloc(sched->tasks, sched->nr_tasks * sizeof(struct task_desc *));
BUG_ON(!sched->tasks);
sched->tasks[task->nr] = task;
if (verbose > 0)
printf("registered task #%ld, PID %ld (%s)\n", sched->nr_tasks, pid, comm);
return task;
}
static void print_task_traces(struct perf_sched *sched)
{
struct task_desc *task;
unsigned long i;
for (i = 0; i < sched->nr_tasks; i++) {
task = sched->tasks[i];
printf("task %6ld (%20s:%10ld), nr_events: %ld\n",
task->nr, task->comm, task->pid, task->nr_events);
}
}
static void add_cross_task_wakeups(struct perf_sched *sched)
{
struct task_desc *task1, *task2;
unsigned long i, j;
for (i = 0; i < sched->nr_tasks; i++) {
task1 = sched->tasks[i];
j = i + 1;
if (j == sched->nr_tasks)
j = 0;
task2 = sched->tasks[j];
add_sched_event_wakeup(sched, task1, 0, task2);
}
}
static void perf_sched__process_event(struct perf_sched *sched,
struct sched_atom *atom)
{
int ret = 0;
switch (atom->type) {
case SCHED_EVENT_RUN:
burn_nsecs(sched, atom->duration);
break;
case SCHED_EVENT_SLEEP:
if (atom->wait_sem)
ret = sem_wait(atom->wait_sem);
BUG_ON(ret);
break;
case SCHED_EVENT_WAKEUP:
if (atom->wait_sem)
ret = sem_post(atom->wait_sem);
BUG_ON(ret);
break;
default:
BUG_ON(1);
}
}
static u64 get_cpu_usage_nsec_parent(void)
{
struct rusage ru;
u64 sum;
int err;
err = getrusage(RUSAGE_SELF, &ru);
BUG_ON(err);
sum = ru.ru_utime.tv_sec * NSEC_PER_SEC + ru.ru_utime.tv_usec * NSEC_PER_USEC;
sum += ru.ru_stime.tv_sec * NSEC_PER_SEC + ru.ru_stime.tv_usec * NSEC_PER_USEC;
return sum;
}
static int self_open_counters(struct perf_sched *sched, unsigned long cur_task)
{
struct perf_event_attr attr;
char sbuf[STRERR_BUFSIZE], info[STRERR_BUFSIZE];
int fd;
struct rlimit limit;
bool need_privilege = false;
memset(&attr, 0, sizeof(attr));
attr.type = PERF_TYPE_SOFTWARE;
attr.config = PERF_COUNT_SW_TASK_CLOCK;
force_again:
fd = sys_perf_event_open(&attr, 0, -1, -1,
perf_event_open_cloexec_flag());
if (fd < 0) {
if (errno == EMFILE) {
if (sched->force) {
BUG_ON(getrlimit(RLIMIT_NOFILE, &limit) == -1);
limit.rlim_cur += sched->nr_tasks - cur_task;
if (limit.rlim_cur > limit.rlim_max) {
limit.rlim_max = limit.rlim_cur;
need_privilege = true;
}
if (setrlimit(RLIMIT_NOFILE, &limit) == -1) {
if (need_privilege && errno == EPERM)
strcpy(info, "Need privilege\n");
} else
goto force_again;
} else
strcpy(info, "Have a try with -f option\n");
}
pr_err("Error: sys_perf_event_open() syscall returned "
"with %d (%s)\n%s", fd,
str_error_r(errno, sbuf, sizeof(sbuf)), info);
exit(EXIT_FAILURE);
}
return fd;
}
static u64 get_cpu_usage_nsec_self(int fd)
{
u64 runtime;
int ret;
ret = read(fd, &runtime, sizeof(runtime));
BUG_ON(ret != sizeof(runtime));
return runtime;
}
struct sched_thread_parms {
struct task_desc *task;
struct perf_sched *sched;
int fd;
};
static void *thread_func(void *ctx)
{
struct sched_thread_parms *parms = ctx;
struct task_desc *this_task = parms->task;
struct perf_sched *sched = parms->sched;
u64 cpu_usage_0, cpu_usage_1;
unsigned long i, ret;
char comm2[22];
int fd = parms->fd;
zfree(&parms);
sprintf(comm2, ":%s", this_task->comm);
prctl(PR_SET_NAME, comm2);
if (fd < 0)
return NULL;
while (!sched->thread_funcs_exit) {
ret = sem_post(&this_task->ready_for_work);
BUG_ON(ret);
mutex_lock(&sched->start_work_mutex);
mutex_unlock(&sched->start_work_mutex);
cpu_usage_0 = get_cpu_usage_nsec_self(fd);
for (i = 0; i < this_task->nr_events; i++) {
this_task->curr_event = i;
perf_sched__process_event(sched, this_task->atoms[i]);
}
cpu_usage_1 = get_cpu_usage_nsec_self(fd);
this_task->cpu_usage = cpu_usage_1 - cpu_usage_0;
ret = sem_post(&this_task->work_done_sem);
BUG_ON(ret);
mutex_lock(&sched->work_done_wait_mutex);
mutex_unlock(&sched->work_done_wait_mutex);
}
return NULL;
}
static void create_tasks(struct perf_sched *sched)
EXCLUSIVE_LOCK_FUNCTION(sched->start_work_mutex)
EXCLUSIVE_LOCK_FUNCTION(sched->work_done_wait_mutex)
{
struct task_desc *task;
pthread_attr_t attr;
unsigned long i;
int err;
err = pthread_attr_init(&attr);
BUG_ON(err);
err = pthread_attr_setstacksize(&attr,
(size_t) max(16 * 1024, (int)PTHREAD_STACK_MIN));
BUG_ON(err);
mutex_lock(&sched->start_work_mutex);
mutex_lock(&sched->work_done_wait_mutex);
for (i = 0; i < sched->nr_tasks; i++) {
struct sched_thread_parms *parms = malloc(sizeof(*parms));
BUG_ON(parms == NULL);
parms->task = task = sched->tasks[i];
parms->sched = sched;
parms->fd = self_open_counters(sched, i);
sem_init(&task->ready_for_work, 0, 0);
sem_init(&task->work_done_sem, 0, 0);
task->curr_event = 0;
err = pthread_create(&task->thread, &attr, thread_func, parms);
BUG_ON(err);
}
}
static void destroy_tasks(struct perf_sched *sched)
UNLOCK_FUNCTION(sched->start_work_mutex)
UNLOCK_FUNCTION(sched->work_done_wait_mutex)
{
struct task_desc *task;
unsigned long i;
int err;
mutex_unlock(&sched->start_work_mutex);
mutex_unlock(&sched->work_done_wait_mutex);
for (i = 0; i < sched->nr_tasks; i++) {
task = sched->tasks[i];
err = pthread_join(task->thread, NULL);
BUG_ON(err);
sem_destroy(&task->ready_for_work);
sem_destroy(&task->work_done_sem);
}
}
static void wait_for_tasks(struct perf_sched *sched)
EXCLUSIVE_LOCKS_REQUIRED(sched->work_done_wait_mutex)
EXCLUSIVE_LOCKS_REQUIRED(sched->start_work_mutex)
{
u64 cpu_usage_0, cpu_usage_1;
struct task_desc *task;
unsigned long i, ret;
sched->start_time = get_nsecs();
sched->cpu_usage = 0;
mutex_unlock(&sched->work_done_wait_mutex);
for (i = 0; i < sched->nr_tasks; i++) {
task = sched->tasks[i];
ret = sem_wait(&task->ready_for_work);
BUG_ON(ret);
sem_init(&task->ready_for_work, 0, 0);
}
mutex_lock(&sched->work_done_wait_mutex);
cpu_usage_0 = get_cpu_usage_nsec_parent();
mutex_unlock(&sched->start_work_mutex);
for (i = 0; i < sched->nr_tasks; i++) {
task = sched->tasks[i];
ret = sem_wait(&task->work_done_sem);
BUG_ON(ret);
sem_init(&task->work_done_sem, 0, 0);
sched->cpu_usage += task->cpu_usage;
task->cpu_usage = 0;
}
cpu_usage_1 = get_cpu_usage_nsec_parent();
if (!sched->runavg_cpu_usage)
sched->runavg_cpu_usage = sched->cpu_usage;
sched->runavg_cpu_usage = (sched->runavg_cpu_usage * (sched->replay_repeat - 1) + sched->cpu_usage) / sched->replay_repeat;
sched->parent_cpu_usage = cpu_usage_1 - cpu_usage_0;
if (!sched->runavg_parent_cpu_usage)
sched->runavg_parent_cpu_usage = sched->parent_cpu_usage;
sched->runavg_parent_cpu_usage = (sched->runavg_parent_cpu_usage * (sched->replay_repeat - 1) +
sched->parent_cpu_usage)/sched->replay_repeat;
mutex_lock(&sched->start_work_mutex);
for (i = 0; i < sched->nr_tasks; i++) {
task = sched->tasks[i];
task->curr_event = 0;
}
}
static void run_one_test(struct perf_sched *sched)
EXCLUSIVE_LOCKS_REQUIRED(sched->work_done_wait_mutex)
EXCLUSIVE_LOCKS_REQUIRED(sched->start_work_mutex)
{
u64 T0, T1, delta, avg_delta, fluct;
T0 = get_nsecs();
wait_for_tasks(sched);
T1 = get_nsecs();
delta = T1 - T0;
sched->sum_runtime += delta;
sched->nr_runs++;
avg_delta = sched->sum_runtime / sched->nr_runs;
if (delta < avg_delta)
fluct = avg_delta - delta;
else
fluct = delta - avg_delta;
sched->sum_fluct += fluct;
if (!sched->run_avg)
sched->run_avg = delta;
sched->run_avg = (sched->run_avg * (sched->replay_repeat - 1) + delta) / sched->replay_repeat;
printf("#%-3ld: %0.3f, ", sched->nr_runs, (double)delta / NSEC_PER_MSEC);
printf("ravg: %0.2f, ", (double)sched->run_avg / NSEC_PER_MSEC);
printf("cpu: %0.2f / %0.2f",
(double)sched->cpu_usage / NSEC_PER_MSEC, (double)sched->runavg_cpu_usage / NSEC_PER_MSEC);
#if 0
printf(" [%0.2f / %0.2f]",
(double)sched->parent_cpu_usage / NSEC_PER_MSEC,
(double)sched->runavg_parent_cpu_usage / NSEC_PER_MSEC);
#endif
printf("\n");
if (sched->nr_sleep_corrections)
printf(" (%ld sleep corrections)\n", sched->nr_sleep_corrections);
sched->nr_sleep_corrections = 0;
}
static void test_calibrations(struct perf_sched *sched)
{
u64 T0, T1;
T0 = get_nsecs();
burn_nsecs(sched, NSEC_PER_MSEC);
T1 = get_nsecs();
printf("the run test took %" PRIu64 " nsecs\n", T1 - T0);
T0 = get_nsecs();
sleep_nsecs(NSEC_PER_MSEC);
T1 = get_nsecs();
printf("the sleep test took %" PRIu64 " nsecs\n", T1 - T0);
}
static int
replay_wakeup_event(struct perf_sched *sched,
struct evsel *evsel, struct perf_sample *sample,
struct machine *machine __maybe_unused)
{
const char *comm = evsel__strval(evsel, sample, "comm");
const u32 pid = evsel__intval(evsel, sample, "pid");
struct task_desc *waker, *wakee;
if (verbose > 0) {
printf("sched_wakeup event %p\n", evsel);
printf(" ... pid %d woke up %s/%d\n", sample->tid, comm, pid);
}
waker = register_pid(sched, sample->tid, "<unknown>");
wakee = register_pid(sched, pid, comm);
add_sched_event_wakeup(sched, waker, sample->time, wakee);
return 0;
}
static int replay_switch_event(struct perf_sched *sched,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine __maybe_unused)
{
const char *prev_comm = evsel__strval(evsel, sample, "prev_comm"),
*next_comm = evsel__strval(evsel, sample, "next_comm");
const u32 prev_pid = evsel__intval(evsel, sample, "prev_pid"),
next_pid = evsel__intval(evsel, sample, "next_pid");
struct task_desc *prev, __maybe_unused *next;
u64 timestamp0, timestamp = sample->time;
int cpu = sample->cpu;
s64 delta;
if (verbose > 0)
printf("sched_switch event %p\n", evsel);
if (cpu >= MAX_CPUS || cpu < 0)
return 0;
timestamp0 = sched->cpu_last_switched[cpu];
if (timestamp0)
delta = timestamp - timestamp0;
else
delta = 0;
if (delta < 0) {
pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
return -1;
}
pr_debug(" ... switch from %s/%d to %s/%d [ran %" PRIu64 " nsecs]\n",
prev_comm, prev_pid, next_comm, next_pid, delta);
prev = register_pid(sched, prev_pid, prev_comm);
next = register_pid(sched, next_pid, next_comm);
sched->cpu_last_switched[cpu] = timestamp;
add_sched_event_run(sched, prev, timestamp, delta);
add_sched_event_sleep(sched, prev, timestamp);
return 0;
}
static int replay_fork_event(struct perf_sched *sched,
union perf_event *event,
struct machine *machine)
{
struct thread *child, *parent;
child = machine__findnew_thread(machine, event->fork.pid,
event->fork.tid);
parent = machine__findnew_thread(machine, event->fork.ppid,
event->fork.ptid);
if (child == NULL || parent == NULL) {
pr_debug("thread does not exist on fork event: child %p, parent %p\n",
child, parent);
goto out_put;
}
if (verbose > 0) {
printf("fork event\n");
printf("... parent: %s/%d\n", thread__comm_str(parent), thread__tid(parent));
printf("... child: %s/%d\n", thread__comm_str(child), thread__tid(child));
}
register_pid(sched, thread__tid(parent), thread__comm_str(parent));
register_pid(sched, thread__tid(child), thread__comm_str(child));
out_put:
thread__put(child);
thread__put(parent);
return 0;
}
struct sort_dimension {
const char *name;
sort_fn_t cmp;
struct list_head list;
};
static inline void init_prio(struct thread_runtime *r)
{
r->prio = -1;
}
static struct thread_runtime *thread__init_runtime(struct thread *thread)
{
struct thread_runtime *r;
r = zalloc(sizeof(struct thread_runtime));
if (!r)
return NULL;
init_stats(&r->run_stats);
init_prio(r);
thread__set_priv(thread, r);
return r;
}
static struct thread_runtime *thread__get_runtime(struct thread *thread)
{
struct thread_runtime *tr;
tr = thread__priv(thread);
if (tr == NULL) {
tr = thread__init_runtime(thread);
if (tr == NULL)
pr_debug("Failed to malloc memory for runtime data.\n");
}
return tr;
}
static int
thread_lat_cmp(struct list_head *list, struct work_atoms *l, struct work_atoms *r)
{
struct sort_dimension *sort;
int ret = 0;
BUG_ON(list_empty(list));
list_for_each_entry(sort, list, list) {
ret = sort->cmp(l, r);
if (ret)
return ret;
}
return ret;
}
static struct work_atoms *
thread_atoms_search(struct rb_root_cached *root, struct thread *thread,
struct list_head *sort_list)
{
struct rb_node *node = root->rb_root.rb_node;
struct work_atoms key = { .thread = thread };
while (node) {
struct work_atoms *atoms;
int cmp;
atoms = container_of(node, struct work_atoms, node);
cmp = thread_lat_cmp(sort_list, &key, atoms);
if (cmp > 0)
node = node->rb_left;
else if (cmp < 0)
node = node->rb_right;
else {
BUG_ON(!RC_CHK_EQUAL(thread, atoms->thread));
return atoms;
}
}
return NULL;
}
static void
__thread_latency_insert(struct rb_root_cached *root, struct work_atoms *data,
struct list_head *sort_list)
{
struct rb_node **new = &(root->rb_root.rb_node), *parent = NULL;
bool leftmost = true;
while (*new) {
struct work_atoms *this;
int cmp;
this = container_of(*new, struct work_atoms, node);
parent = *new;
cmp = thread_lat_cmp(sort_list, data, this);
if (cmp > 0)
new = &((*new)->rb_left);
else {
new = &((*new)->rb_right);
leftmost = false;
}
}
rb_link_node(&data->node, parent, new);
rb_insert_color_cached(&data->node, root, leftmost);
}
static int thread_atoms_insert(struct perf_sched *sched, struct thread *thread)
{
struct work_atoms *atoms = zalloc(sizeof(*atoms));
if (!atoms) {
pr_err("No memory at %s\n", __func__);
return -1;
}
atoms->thread = thread__get(thread);
INIT_LIST_HEAD(&atoms->work_list);
__thread_latency_insert(&sched->atom_root, atoms, &sched->cmp_pid);
return 0;
}
static int
add_sched_out_event(struct work_atoms *atoms,
char run_state,
u64 timestamp)
{
struct work_atom *atom = zalloc(sizeof(*atom));
if (!atom) {
pr_err("Non memory at %s", __func__);
return -1;
}
atom->sched_out_time = timestamp;
if (run_state == 'R') {
atom->state = THREAD_WAIT_CPU;
atom->wake_up_time = atom->sched_out_time;
}
list_add_tail(&atom->list, &atoms->work_list);
return 0;
}
static void
add_runtime_event(struct work_atoms *atoms, u64 delta,
u64 timestamp __maybe_unused)
{
struct work_atom *atom;
BUG_ON(list_empty(&atoms->work_list));
atom = list_entry(atoms->work_list.prev, struct work_atom, list);
atom->runtime += delta;
atoms->total_runtime += delta;
}
static void
add_sched_in_event(struct work_atoms *atoms, u64 timestamp)
{
struct work_atom *atom;
u64 delta;
if (list_empty(&atoms->work_list))
return;
atom = list_entry(atoms->work_list.prev, struct work_atom, list);
if (atom->state != THREAD_WAIT_CPU)
return;
if (timestamp < atom->wake_up_time) {
atom->state = THREAD_IGNORE;
return;
}
atom->state = THREAD_SCHED_IN;
atom->sched_in_time = timestamp;
delta = atom->sched_in_time - atom->wake_up_time;
atoms->total_lat += delta;
if (delta > atoms->max_lat) {
atoms->max_lat = delta;
atoms->max_lat_start = atom->wake_up_time;
atoms->max_lat_end = timestamp;
}
atoms->nb_atoms++;
}
static void free_work_atoms(struct work_atoms *atoms)
{
struct work_atom *atom, *tmp;
if (atoms == NULL)
return;
list_for_each_entry_safe(atom, tmp, &atoms->work_list, list) {
list_del(&atom->list);
free(atom);
}
thread__zput(atoms->thread);
free(atoms);
}
static int latency_switch_event(struct perf_sched *sched,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine)
{
const u32 prev_pid = evsel__intval(evsel, sample, "prev_pid"),
next_pid = evsel__intval(evsel, sample, "next_pid");
const char prev_state = evsel__taskstate(evsel, sample, "prev_state");
struct work_atoms *out_events, *in_events;
struct thread *sched_out, *sched_in;
u64 timestamp0, timestamp = sample->time;
int cpu = sample->cpu, err = -1;
s64 delta;
BUG_ON(cpu >= MAX_CPUS || cpu < 0);
timestamp0 = sched->cpu_last_switched[cpu];
sched->cpu_last_switched[cpu] = timestamp;
if (timestamp0)
delta = timestamp - timestamp0;
else
delta = 0;
if (delta < 0) {
pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
return -1;
}
sched_out = machine__findnew_thread(machine, -1, prev_pid);
sched_in = machine__findnew_thread(machine, -1, next_pid);
if (sched_out == NULL || sched_in == NULL)
goto out_put;
out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
if (!out_events) {
if (thread_atoms_insert(sched, sched_out))
goto out_put;
out_events = thread_atoms_search(&sched->atom_root, sched_out, &sched->cmp_pid);
if (!out_events) {
pr_err("out-event: Internal tree error");
goto out_put;
}
}
if (add_sched_out_event(out_events, prev_state, timestamp))
return -1;
in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
if (!in_events) {
if (thread_atoms_insert(sched, sched_in))
goto out_put;
in_events = thread_atoms_search(&sched->atom_root, sched_in, &sched->cmp_pid);
if (!in_events) {
pr_err("in-event: Internal tree error");
goto out_put;
}
if (add_sched_out_event(in_events, 'R', timestamp))
goto out_put;
}
add_sched_in_event(in_events, timestamp);
err = 0;
out_put:
thread__put(sched_out);
thread__put(sched_in);
return err;
}
static int latency_runtime_event(struct perf_sched *sched,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine)
{
const u32 pid = evsel__intval(evsel, sample, "pid");
const u64 runtime = evsel__intval(evsel, sample, "runtime");
struct thread *thread = machine__findnew_thread(machine, -1, pid);
struct work_atoms *atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
u64 timestamp = sample->time;
int cpu = sample->cpu, err = -1;
if (thread == NULL)
return -1;
BUG_ON(cpu >= MAX_CPUS || cpu < 0);
if (!atoms) {
if (thread_atoms_insert(sched, thread))
goto out_put;
atoms = thread_atoms_search(&sched->atom_root, thread, &sched->cmp_pid);
if (!atoms) {
pr_err("in-event: Internal tree error");
goto out_put;
}
if (add_sched_out_event(atoms, 'R', timestamp))
goto out_put;
}
add_runtime_event(atoms, runtime, timestamp);
err = 0;
out_put:
thread__put(thread);
return err;
}
static int latency_wakeup_event(struct perf_sched *sched,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine)
{
const u32 pid = evsel__intval(evsel, sample, "pid");
struct work_atoms *atoms;
struct work_atom *atom;
struct thread *wakee;
u64 timestamp = sample->time;
int err = -1;
wakee = machine__findnew_thread(machine, -1, pid);
if (wakee == NULL)
return -1;
atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
if (!atoms) {
if (thread_atoms_insert(sched, wakee))
goto out_put;
atoms = thread_atoms_search(&sched->atom_root, wakee, &sched->cmp_pid);
if (!atoms) {
pr_err("wakeup-event: Internal tree error");
goto out_put;
}
if (add_sched_out_event(atoms, 'S', timestamp))
goto out_put;
}
BUG_ON(list_empty(&atoms->work_list));
atom = list_entry(atoms->work_list.prev, struct work_atom, list);
if (sched->profile_cpu == -1 && atom->state != THREAD_SLEEPING)
goto out_ok;
sched->nr_timestamps++;
if (atom->sched_out_time > timestamp) {
sched->nr_unordered_timestamps++;
goto out_ok;
}
atom->state = THREAD_WAIT_CPU;
atom->wake_up_time = timestamp;
out_ok:
err = 0;
out_put:
thread__put(wakee);
return err;
}
static int latency_migrate_task_event(struct perf_sched *sched,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine)
{
const u32 pid = evsel__intval(evsel, sample, "pid");
u64 timestamp = sample->time;
struct work_atoms *atoms;
struct work_atom *atom;
struct thread *migrant;
int err = -1;
if (sched->profile_cpu == -1)
return 0;
migrant = machine__findnew_thread(machine, -1, pid);
if (migrant == NULL)
return -1;
atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
if (!atoms) {
if (thread_atoms_insert(sched, migrant))
goto out_put;
register_pid(sched, thread__tid(migrant), thread__comm_str(migrant));
atoms = thread_atoms_search(&sched->atom_root, migrant, &sched->cmp_pid);
if (!atoms) {
pr_err("migration-event: Internal tree error");
goto out_put;
}
if (add_sched_out_event(atoms, 'R', timestamp))
goto out_put;
}
BUG_ON(list_empty(&atoms->work_list));
atom = list_entry(atoms->work_list.prev, struct work_atom, list);
atom->sched_in_time = atom->sched_out_time = atom->wake_up_time = timestamp;
sched->nr_timestamps++;
if (atom->sched_out_time > timestamp)
sched->nr_unordered_timestamps++;
err = 0;
out_put:
thread__put(migrant);
return err;
}
static void output_lat_thread(struct perf_sched *sched, struct work_atoms *work_list)
{
int i;
int ret;
u64 avg;
char max_lat_start[32], max_lat_end[32];
if (!work_list->nb_atoms)
return;
if (!strcmp(thread__comm_str(work_list->thread), "swapper"))
return;
sched->all_runtime += work_list->total_runtime;
sched->all_count += work_list->nb_atoms;
if (work_list->num_merged > 1) {
ret = printf(" %s:(%d) ", thread__comm_str(work_list->thread),
work_list->num_merged);
} else {
ret = printf(" %s:%d ", thread__comm_str(work_list->thread),
thread__tid(work_list->thread));
}
for (i = 0; i < 24 - ret; i++)
printf(" ");
avg = work_list->total_lat / work_list->nb_atoms;
timestamp__scnprintf_usec(work_list->max_lat_start, max_lat_start, sizeof(max_lat_start));
timestamp__scnprintf_usec(work_list->max_lat_end, max_lat_end, sizeof(max_lat_end));
printf("|%11.3f ms |%9" PRIu64 " | avg:%8.3f ms | max:%8.3f ms | max start: %12s s | max end: %12s s\n",
(double)work_list->total_runtime / NSEC_PER_MSEC,
work_list->nb_atoms, (double)avg / NSEC_PER_MSEC,
(double)work_list->max_lat / NSEC_PER_MSEC,
max_lat_start, max_lat_end);
}
static int pid_cmp(struct work_atoms *l, struct work_atoms *r)
{
pid_t l_tid, r_tid;
if (RC_CHK_EQUAL(l->thread, r->thread))
return 0;
l_tid = thread__tid(l->thread);
r_tid = thread__tid(r->thread);
if (l_tid < r_tid)
return -1;
if (l_tid > r_tid)
return 1;
return (int)(RC_CHK_ACCESS(l->thread) - RC_CHK_ACCESS(r->thread));
}
static int avg_cmp(struct work_atoms *l, struct work_atoms *r)
{
u64 avgl, avgr;
if (!l->nb_atoms)
return -1;
if (!r->nb_atoms)
return 1;
avgl = l->total_lat / l->nb_atoms;
avgr = r->total_lat / r->nb_atoms;
if (avgl < avgr)
return -1;
if (avgl > avgr)
return 1;
return 0;
}
static int max_cmp(struct work_atoms *l, struct work_atoms *r)
{
if (l->max_lat < r->max_lat)
return -1;
if (l->max_lat > r->max_lat)
return 1;
return 0;
}
static int switch_cmp(struct work_atoms *l, struct work_atoms *r)
{
if (l->nb_atoms < r->nb_atoms)
return -1;
if (l->nb_atoms > r->nb_atoms)
return 1;
return 0;
}
static int runtime_cmp(struct work_atoms *l, struct work_atoms *r)
{
if (l->total_runtime < r->total_runtime)
return -1;
if (l->total_runtime > r->total_runtime)
return 1;
return 0;
}
static int sort_dimension__add(const char *tok, struct list_head *list)
{
size_t i;
static struct sort_dimension avg_sort_dimension = {
.name = "avg",
.cmp = avg_cmp,
};
static struct sort_dimension max_sort_dimension = {
.name = "max",
.cmp = max_cmp,
};
static struct sort_dimension pid_sort_dimension = {
.name = "pid",
.cmp = pid_cmp,
};
static struct sort_dimension runtime_sort_dimension = {
.name = "runtime",
.cmp = runtime_cmp,
};
static struct sort_dimension switch_sort_dimension = {
.name = "switch",
.cmp = switch_cmp,
};
struct sort_dimension *available_sorts[] = {
&pid_sort_dimension,
&avg_sort_dimension,
&max_sort_dimension,
&switch_sort_dimension,
&runtime_sort_dimension,
};
for (i = 0; i < ARRAY_SIZE(available_sorts); i++) {
if (!strcmp(available_sorts[i]->name, tok)) {
list_add_tail(&available_sorts[i]->list, list);
return 0;
}
}
return -1;
}
static void perf_sched__sort_lat(struct perf_sched *sched)
{
struct rb_node *node;
struct rb_root_cached *root = &sched->atom_root;
again:
for (;;) {
struct work_atoms *data;
node = rb_first_cached(root);
if (!node)
break;
rb_erase_cached(node, root);
data = rb_entry(node, struct work_atoms, node);
__thread_latency_insert(&sched->sorted_atom_root, data, &sched->sort_list);
}
if (root == &sched->atom_root) {
root = &sched->merged_atom_root;
goto again;
}
}
static int process_sched_wakeup_event(const struct perf_tool *tool,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
if (sched->tp_handler->wakeup_event)
return sched->tp_handler->wakeup_event(sched, evsel, sample, machine);
return 0;
}
static int process_sched_wakeup_ignore(const struct perf_tool *tool __maybe_unused,
struct evsel *evsel __maybe_unused,
struct perf_sample *sample __maybe_unused,
struct machine *machine __maybe_unused)
{
return 0;
}
static bool thread__has_color(struct thread *thread)
{
return thread__priv(thread) != NULL;
}
static struct thread*
map__findnew_thread(struct perf_sched *sched, struct machine *machine, pid_t pid, pid_t tid)
{
struct thread *thread = machine__findnew_thread(machine, pid, tid);
bool color = false;
if (!sched->map.color_pids || !thread || thread__priv(thread))
return thread;
if (thread_map__has(sched->map.color_pids, tid))
color = true;
thread__set_priv(thread, color ? ((void*)1) : NULL);
return thread;
}
static bool sched_match_task(struct perf_sched *sched, const char *comm_str)
{
bool fuzzy_match = sched->map.fuzzy;
struct strlist *task_names = sched->map.task_names;
struct str_node *node;
strlist__for_each_entry(node, task_names) {
bool match_found = fuzzy_match ? !!strstr(comm_str, node->s) :
!strcmp(comm_str, node->s);
if (match_found)
return true;
}
return false;
}
static void print_sched_map(struct perf_sched *sched, struct perf_cpu this_cpu, int cpus_nr,
const char *color, bool sched_out)
{
for (int i = 0; i < cpus_nr; i++) {
struct perf_cpu cpu = {
.cpu = sched->map.comp ? sched->map.comp_cpus[i].cpu : i,
};
struct thread *curr_thread = sched->curr_thread[cpu.cpu];
struct thread *curr_out_thread = sched->curr_out_thread[cpu.cpu];
struct thread_runtime *curr_tr;
const char *pid_color = color;
const char *cpu_color = color;
char symbol = ' ';
struct thread *thread_to_check = sched_out ? curr_out_thread : curr_thread;
if (thread_to_check && thread__has_color(thread_to_check))
pid_color = COLOR_PIDS;
if (sched->map.color_cpus && perf_cpu_map__has(sched->map.color_cpus, cpu))
cpu_color = COLOR_CPUS;
if (cpu.cpu == this_cpu.cpu)
symbol = '*';
color_fprintf(stdout, cpu.cpu != this_cpu.cpu ? color : cpu_color, "%c", symbol);
thread_to_check = sched_out ? sched->curr_out_thread[cpu.cpu] :
sched->curr_thread[cpu.cpu];
if (thread_to_check) {
curr_tr = thread__get_runtime(thread_to_check);
if (curr_tr == NULL)
return;
if (sched_out) {
if (cpu.cpu == this_cpu.cpu)
color_fprintf(stdout, color, "- ");
else {
curr_tr = thread__get_runtime(sched->curr_thread[cpu.cpu]);
if (curr_tr != NULL)
color_fprintf(stdout, pid_color, "%2s ",
curr_tr->shortname);
}
} else
color_fprintf(stdout, pid_color, "%2s ", curr_tr->shortname);
} else
color_fprintf(stdout, color, " ");
}
}
static int map_switch_event(struct perf_sched *sched, struct evsel *evsel,
struct perf_sample *sample, struct machine *machine)
{
const u32 next_pid = evsel__intval(evsel, sample, "next_pid");
const u32 prev_pid = evsel__intval(evsel, sample, "prev_pid");
struct thread *sched_in, *sched_out;
struct thread_runtime *tr;
int new_shortname;
u64 timestamp0, timestamp = sample->time;
s64 delta;
struct perf_cpu this_cpu = {
.cpu = sample->cpu,
};
int cpus_nr;
int proceed;
bool new_cpu = false;
const char *color = PERF_COLOR_NORMAL;
char stimestamp[32];
const char *str;
int ret = -1;
BUG_ON(this_cpu.cpu >= MAX_CPUS || this_cpu.cpu < 0);
if (this_cpu.cpu > sched->max_cpu.cpu)
sched->max_cpu = this_cpu;
if (sched->map.comp) {
cpus_nr = bitmap_weight(sched->map.comp_cpus_mask, MAX_CPUS);
if (!__test_and_set_bit(this_cpu.cpu, sched->map.comp_cpus_mask)) {
sched->map.comp_cpus[cpus_nr++] = this_cpu;
new_cpu = true;
}
} else
cpus_nr = sched->max_cpu.cpu;
timestamp0 = sched->cpu_last_switched[this_cpu.cpu];
sched->cpu_last_switched[this_cpu.cpu] = timestamp;
if (timestamp0)
delta = timestamp - timestamp0;
else
delta = 0;
if (delta < 0) {
pr_err("hm, delta: %" PRIu64 " < 0 ?\n", delta);
return -1;
}
sched_in = map__findnew_thread(sched, machine, -1, next_pid);
sched_out = map__findnew_thread(sched, machine, -1, prev_pid);
if (sched_in == NULL || sched_out == NULL)
goto out;
tr = thread__get_runtime(sched_in);
if (tr == NULL)
goto out;
thread__put(sched->curr_thread[this_cpu.cpu]);
thread__put(sched->curr_out_thread[this_cpu.cpu]);
sched->curr_thread[this_cpu.cpu] = thread__get(sched_in);
sched->curr_out_thread[this_cpu.cpu] = thread__get(sched_out);
ret = 0;
str = thread__comm_str(sched_in);
new_shortname = 0;
if (!tr->shortname[0]) {
if (!strcmp(thread__comm_str(sched_in), "swapper")) {
tr->shortname[0] = '.';
tr->shortname[1] = ' ';
} else if (!sched->map.task_name || sched_match_task(sched, str)) {
tr->shortname[0] = sched->next_shortname1;
tr->shortname[1] = sched->next_shortname2;
if (sched->next_shortname1 < 'Z') {
sched->next_shortname1++;
} else {
sched->next_shortname1 = 'A';
if (sched->next_shortname2 < '9')
sched->next_shortname2++;
else
sched->next_shortname2 = '0';
}
} else {
tr->shortname[0] = '-';
tr->shortname[1] = ' ';
}
new_shortname = 1;
}
if (sched->map.cpus && !perf_cpu_map__has(sched->map.cpus, this_cpu))
goto out;
proceed = 0;
str = thread__comm_str(sched_in);
if (sched->map.task_name && !sched_match_task(sched, str)) {
if (!sched_match_task(sched, thread__comm_str(sched_out)))
goto out;
else
goto sched_out;
} else {
str = thread__comm_str(sched_out);
if (!(sched->map.task_name && !sched_match_task(sched, str)))
proceed = 1;
}
printf(" ");
print_sched_map(sched, this_cpu, cpus_nr, color, false);
timestamp__scnprintf_usec(timestamp, stimestamp, sizeof(stimestamp));
color_fprintf(stdout, color, " %12s secs ", stimestamp);
if (new_shortname || tr->comm_changed || (verbose > 0 && thread__tid(sched_in))) {
const char *pid_color = color;
if (thread__has_color(sched_in))
pid_color = COLOR_PIDS;
color_fprintf(stdout, pid_color, "%s => %s:%d",
tr->shortname, thread__comm_str(sched_in), thread__tid(sched_in));
tr->comm_changed = false;
}
if (sched->map.comp && new_cpu)
color_fprintf(stdout, color, " (CPU %d)", this_cpu.cpu);
if (proceed != 1) {
color_fprintf(stdout, color, "\n");
goto out;
}
sched_out:
if (sched->map.task_name) {
tr = thread__get_runtime(sched->curr_out_thread[this_cpu.cpu]);
if (strcmp(tr->shortname, "") == 0)
goto out;
if (proceed == 1)
color_fprintf(stdout, color, "\n");
printf(" ");
print_sched_map(sched, this_cpu, cpus_nr, color, true);
timestamp__scnprintf_usec(timestamp, stimestamp, sizeof(stimestamp));
color_fprintf(stdout, color, " %12s secs ", stimestamp);
}
color_fprintf(stdout, color, "\n");
out:
thread__put(sched_out);
thread__put(sched_in);
return ret;
}
static int process_sched_switch_event(const struct perf_tool *tool,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
int this_cpu = sample->cpu, err = 0;
u32 prev_pid = evsel__intval(evsel, sample, "prev_pid"),
next_pid = evsel__intval(evsel, sample, "next_pid");
if (sched->curr_pid[this_cpu] != (u32)-1) {
if (sched->curr_pid[this_cpu] != prev_pid)
sched->nr_context_switch_bugs++;
}
if (sched->tp_handler->switch_event)
err = sched->tp_handler->switch_event(sched, evsel, sample, machine);
sched->curr_pid[this_cpu] = next_pid;
return err;
}
static int process_sched_runtime_event(const struct perf_tool *tool,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
if (sched->tp_handler->runtime_event)
return sched->tp_handler->runtime_event(sched, evsel, sample, machine);
return 0;
}
static int perf_sched__process_fork_event(const struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
perf_event__process_fork(tool, event, sample, machine);
if (sched->tp_handler->fork_event)
return sched->tp_handler->fork_event(sched, event, machine);
return 0;
}
static int process_sched_migrate_task_event(const struct perf_tool *tool,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
if (sched->tp_handler->migrate_task_event)
return sched->tp_handler->migrate_task_event(sched, evsel, sample, machine);
return 0;
}
typedef int (*tracepoint_handler)(const struct perf_tool *tool,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine);
static int perf_sched__process_tracepoint_sample(const struct perf_tool *tool __maybe_unused,
union perf_event *event __maybe_unused,
struct perf_sample *sample,
struct evsel *evsel,
struct machine *machine)
{
int err = 0;
if (evsel->handler != NULL) {
tracepoint_handler f = evsel->handler;
err = f(tool, evsel, sample, machine);
}
return err;
}
static int perf_sched__process_comm(const struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine)
{
struct thread *thread;
struct thread_runtime *tr;
int err;
err = perf_event__process_comm(tool, event, sample, machine);
if (err)
return err;
thread = machine__find_thread(machine, sample->pid, sample->tid);
if (!thread) {
pr_err("Internal error: can't find thread\n");
return -1;
}
tr = thread__get_runtime(thread);
if (tr == NULL) {
thread__put(thread);
return -1;
}
tr->comm_changed = true;
thread__put(thread);
return 0;
}
static int perf_sched__read_events(struct perf_sched *sched)
{
struct evsel_str_handler handlers[] = {
{ "sched:sched_switch", process_sched_switch_event, },
{ "sched:sched_stat_runtime", process_sched_runtime_event, },
{ "sched:sched_wakeup", process_sched_wakeup_event, },
{ "sched:sched_waking", process_sched_wakeup_event, },
{ "sched:sched_wakeup_new", process_sched_wakeup_event, },
{ "sched:sched_migrate_task", process_sched_migrate_task_event, },
};
struct perf_session *session;
struct perf_data data = {
.path = input_name,
.mode = PERF_DATA_MODE_READ,
.force = sched->force,
};
int rc = -1;
session = perf_session__new(&data, &sched->tool);
if (IS_ERR(session)) {
pr_debug("Error creating perf session");
return PTR_ERR(session);
}
symbol__init(perf_session__env(session));
if (evlist__find_tracepoint_by_name(session->evlist, "sched:sched_waking"))
handlers[2].handler = process_sched_wakeup_ignore;
if (perf_session__set_tracepoints_handlers(session, handlers))
goto out_delete;
if (perf_session__has_traces(session, "record -R")) {
int err = perf_session__process_events(session);
if (err) {
pr_err("Failed to process events, error %d", err);
goto out_delete;
}
sched->nr_events = session->evlist->stats.nr_events[0];
sched->nr_lost_events = session->evlist->stats.total_lost;
sched->nr_lost_chunks = session->evlist->stats.nr_events[PERF_RECORD_LOST];
}
rc = 0;
out_delete:
perf_session__delete(session);
return rc;
}
static inline void print_sched_time(unsigned long long nsecs, int width)
{
unsigned long msecs;
unsigned long usecs;
msecs = nsecs / NSEC_PER_MSEC;
nsecs -= msecs * NSEC_PER_MSEC;
usecs = nsecs / NSEC_PER_USEC;
printf("%*lu.%03lu ", width, msecs, usecs);
}
static struct evsel_runtime *evsel__get_runtime(struct evsel *evsel)
{
struct evsel_runtime *r = evsel->priv;
if (r == NULL) {
r = zalloc(sizeof(struct evsel_runtime));
evsel->priv = r;
}
return r;
}
static void evsel__save_time(struct evsel *evsel, u64 timestamp, u32 cpu)
{
struct evsel_runtime *r = evsel__get_runtime(evsel);
if (r == NULL)
return;
if ((cpu >= r->ncpu) || (r->last_time == NULL)) {
int i, n = __roundup_pow_of_two(cpu+1);
void *p = r->last_time;
p = realloc(r->last_time, n * sizeof(u64));
if (!p)
return;
r->last_time = p;
for (i = r->ncpu; i < n; ++i)
r->last_time[i] = (u64) 0;
r->ncpu = n;
}
r->last_time[cpu] = timestamp;
}
static u64 evsel__get_time(struct evsel *evsel, u32 cpu)
{
struct evsel_runtime *r = evsel__get_runtime(evsel);
if ((r == NULL) || (r->last_time == NULL) || (cpu >= r->ncpu))
return 0;
return r->last_time[cpu];
}
static void timehist__evsel_priv_destructor(void *priv)
{
struct evsel_runtime *r = priv;
if (r) {
free(r->last_time);
free(r);
}
}
static int comm_width = 30;
static char *timehist_get_commstr(struct thread *thread)
{
static char str[32];
const char *comm = thread__comm_str(thread);
pid_t tid = thread__tid(thread);
pid_t pid = thread__pid(thread);
int n;
if (pid == 0)
n = scnprintf(str, sizeof(str), "%s", comm);
else if (tid != pid)
n = scnprintf(str, sizeof(str), "%s[%d/%d]", comm, tid, pid);
else
n = scnprintf(str, sizeof(str), "%s[%d]", comm, tid);
if (n > comm_width)
comm_width = n;
return str;
}
#define MAX_PRIO_STR_LEN 8
static char *timehist_get_priostr(struct evsel *evsel,
struct thread *thread,
struct perf_sample *sample)
{
static char prio_str[16];
int prev_prio = (int)evsel__intval(evsel, sample, "prev_prio");
struct thread_runtime *tr = thread__priv(thread);
if (tr->prio != prev_prio && tr->prio != -1)
scnprintf(prio_str, sizeof(prio_str), "%d->%d", tr->prio, prev_prio);
else
scnprintf(prio_str, sizeof(prio_str), "%d", prev_prio);
return prio_str;
}
static void timehist_header(struct perf_sched *sched)
{
u32 ncpus = sched->max_cpu.cpu + 1;
u32 i, j;
printf("%15s %6s ", "time", "cpu");
if (sched->show_cpu_visual) {
printf(" ");
for (i = 0, j = 0; i < ncpus; ++i) {
printf("%x", j++);
if (j > 15)
j = 0;
}
printf(" ");
}
printf(" %-*s", comm_width, "task name");
if (sched->show_prio)
printf(" %-*s", MAX_PRIO_STR_LEN, "prio");
printf(" %9s %9s %9s", "wait time", "sch delay", "run time");
if (sched->pre_migrations)
printf(" %9s", "pre-mig time");
if (sched->show_state)
printf(" %s", "state");
printf("\n");
printf("%15s %-6s ", "", "");
if (sched->show_cpu_visual)
printf(" %*s ", ncpus, "");
printf(" %-*s", comm_width, "[tid/pid]");
if (sched->show_prio)
printf(" %-*s", MAX_PRIO_STR_LEN, "");
printf(" %9s %9s %9s", "(msec)", "(msec)", "(msec)");
if (sched->pre_migrations)
printf(" %9s", "(msec)");
printf("\n");
printf("%.15s %.6s ", graph_dotted_line, graph_dotted_line);
if (sched->show_cpu_visual)
printf(" %.*s ", ncpus, graph_dotted_line);
printf(" %.*s", comm_width, graph_dotted_line);
if (sched->show_prio)
printf(" %.*s", MAX_PRIO_STR_LEN, graph_dotted_line);
printf(" %.9s %.9s %.9s", graph_dotted_line, graph_dotted_line, graph_dotted_line);
if (sched->pre_migrations)
printf(" %.9s", graph_dotted_line);
if (sched->show_state)
printf(" %.5s", graph_dotted_line);
printf("\n");
}
static void timehist_print_sample(struct perf_sched *sched,
struct evsel *evsel,
struct perf_sample *sample,
struct addr_location *al,
struct thread *thread,
u64 t, const char state)
{
struct thread_runtime *tr = thread__priv(thread);
const char *next_comm = evsel__strval(evsel, sample, "next_comm");
const u32 next_pid = evsel__intval(evsel, sample, "next_pid");
u32 max_cpus = sched->max_cpu.cpu + 1;
char tstr[64];
char nstr[30];
u64 wait_time;
if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
return;
timestamp__scnprintf_usec(t, tstr, sizeof(tstr));
printf("%15s [%04d] ", tstr, sample->cpu);
if (sched->show_cpu_visual) {
u32 i;
char c;
printf(" ");
for (i = 0; i < max_cpus; ++i) {
if (i == sample->cpu)
c = (thread__tid(thread) == 0) ? 'i' : 's';
else
c = ' ';
printf("%c", c);
}
printf(" ");
}
if (!thread__comm_set(thread)) {
const char *prev_comm = evsel__strval(evsel, sample, "prev_comm");
thread__set_comm(thread, prev_comm, sample->time);
}
printf(" %-*s ", comm_width, timehist_get_commstr(thread));
if (sched->show_prio)
printf(" %-*s ", MAX_PRIO_STR_LEN, timehist_get_priostr(evsel, thread, sample));
wait_time = tr->dt_sleep + tr->dt_iowait + tr->dt_preempt;
print_sched_time(wait_time, 6);
print_sched_time(tr->dt_delay, 6);
print_sched_time(tr->dt_run, 6);
if (sched->pre_migrations)
print_sched_time(tr->dt_pre_mig, 6);
if (sched->show_state)
printf(" %5c ", thread__tid(thread) == 0 ? 'I' : state);
if (sched->show_next) {
snprintf(nstr, sizeof(nstr), "next: %s[%d]", next_comm, next_pid);
printf(" %-*s", comm_width, nstr);
}
if (sched->show_wakeups && !sched->show_next)
printf(" %-*s", comm_width, "");
if (thread__tid(thread) == 0)
goto out;
if (sched->show_callchain)
printf(" ");
sample__fprintf_sym(sample, al, 0,
EVSEL__PRINT_SYM | EVSEL__PRINT_ONELINE |
EVSEL__PRINT_CALLCHAIN_ARROW |
EVSEL__PRINT_SKIP_IGNORED,
get_tls_callchain_cursor(), symbol_conf.bt_stop_list, stdout);
out:
printf("\n");
}
static void timehist_update_runtime_stats(struct thread_runtime *r,
u64 t, u64 tprev)
{
r->dt_delay = 0;
r->dt_sleep = 0;
r->dt_iowait = 0;
r->dt_preempt = 0;
r->dt_run = 0;
r->dt_pre_mig = 0;
if (tprev) {
r->dt_run = t - tprev;
if (r->ready_to_run) {
if (r->ready_to_run > tprev)
pr_debug("time travel: wakeup time for task > previous sched_switch event\n");
else
r->dt_delay = tprev - r->ready_to_run;
if ((r->migrated > r->ready_to_run) && (r->migrated < tprev))
r->dt_pre_mig = r->migrated - r->ready_to_run;
}
if (r->last_time > tprev)
pr_debug("time travel: last sched out time for task > previous sched_switch event\n");
else if (r->last_time) {
u64 dt_wait = tprev - r->last_time;
if (r->last_state == 'R')
r->dt_preempt = dt_wait;
else if (r->last_state == 'D')
r->dt_iowait = dt_wait;
else
r->dt_sleep = dt_wait;
}
}
update_stats(&r->run_stats, r->dt_run);
r->total_run_time += r->dt_run;
r->total_delay_time += r->dt_delay;
r->total_sleep_time += r->dt_sleep;
r->total_iowait_time += r->dt_iowait;
r->total_preempt_time += r->dt_preempt;
r->total_pre_mig_time += r->dt_pre_mig;
}
static bool is_idle_sample(struct perf_sample *sample,
struct evsel *evsel)
{
if (evsel__name_is(evsel, "sched:sched_switch"))
return evsel__intval(evsel, sample, "prev_pid") == 0;
return sample->pid == 0;
}
static void save_task_callchain(struct perf_sched *sched,
struct perf_sample *sample,
struct evsel *evsel,
struct machine *machine)
{
struct callchain_cursor *cursor;
struct thread *thread;
thread = machine__findnew_thread(machine, sample->pid, sample->pid);
if (thread == NULL) {
pr_debug("Failed to get thread for pid %d.\n", sample->pid);
return;
}
if (!sched->show_callchain || sample->callchain == NULL) {
thread__put(thread);
return;
}
cursor = get_tls_callchain_cursor();
if (thread__resolve_callchain(thread, cursor, evsel, sample,
NULL, NULL, sched->max_stack + 2) != 0) {
if (verbose > 0)
pr_err("Failed to resolve callchain. Skipping\n");
thread__put(thread);
return;
}
callchain_cursor_commit(cursor);
thread__put(thread);
while (true) {
struct callchain_cursor_node *node;
struct symbol *sym;
node = callchain_cursor_current(cursor);
if (node == NULL)
break;
sym = node->ms.sym;
if (sym) {
if (!strcmp(sym->name, "schedule") ||
!strcmp(sym->name, "__schedule") ||
!strcmp(sym->name, "preempt_schedule"))
sym->ignore = 1;
}
callchain_cursor_advance(cursor);
}
}
static int init_idle_thread(struct thread *thread)
{
struct idle_thread_runtime *itr;
thread__set_comm(thread, idle_comm, 0);
itr = zalloc(sizeof(*itr));
if (itr == NULL)
return -ENOMEM;
init_prio(&itr->tr);
init_stats(&itr->tr.run_stats);
callchain_init(&itr->callchain);
callchain_cursor_reset(&itr->cursor);
thread__set_priv(thread, itr);
return 0;
}
static int init_idle_threads(int ncpu)
{
int i, ret;
idle_threads = zalloc(ncpu * sizeof(struct thread *));
if (!idle_threads)
return -ENOMEM;
idle_max_cpu = ncpu;
for (i = 0; i < ncpu; ++i) {
idle_threads[i] = thread__new(0, 0);
if (idle_threads[i] == NULL)
return -ENOMEM;
ret = init_idle_thread(idle_threads[i]);
if (ret < 0)
return ret;
}
return 0;
}
static void free_idle_threads(void)
{
int i;
if (idle_threads == NULL)
return;
for (i = 0; i < idle_max_cpu; ++i) {
struct thread *idle = idle_threads[i];
if (idle) {
struct idle_thread_runtime *itr;
itr = thread__priv(idle);
if (itr)
thread__put(itr->last_thread);
thread__delete(idle);
}
}
free(idle_threads);
}
static struct thread *get_idle_thread(int cpu)
{
if ((cpu >= idle_max_cpu) || (idle_threads == NULL)) {
int i, j = __roundup_pow_of_two(cpu+1);
void *p;
p = realloc(idle_threads, j * sizeof(struct thread *));
if (!p)
return NULL;
idle_threads = (struct thread **) p;
for (i = idle_max_cpu; i < j; ++i)
idle_threads[i] = NULL;
idle_max_cpu = j;
}
if (idle_threads[cpu] == NULL) {
idle_threads[cpu] = thread__new(0, 0);
if (idle_threads[cpu]) {
if (init_idle_thread(idle_threads[cpu]) < 0)
return NULL;
}
}
return thread__get(idle_threads[cpu]);
}
static void save_idle_callchain(struct perf_sched *sched,
struct idle_thread_runtime *itr,
struct perf_sample *sample)
{
struct callchain_cursor *cursor;
if (!sched->show_callchain || sample->callchain == NULL)
return;
cursor = get_tls_callchain_cursor();
if (cursor == NULL)
return;
callchain_cursor__copy(&itr->cursor, cursor);
}
static struct thread *timehist_get_thread(struct perf_sched *sched,
struct perf_sample *sample,
struct machine *machine,
struct evsel *evsel)
{
struct thread *thread;
if (is_idle_sample(sample, evsel)) {
thread = get_idle_thread(sample->cpu);
if (thread == NULL)
pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu);
} else {
thread = machine__findnew_thread(machine, sample->pid,
sample->tid ?: sample->pid);
if (thread == NULL) {
pr_debug("Failed to get thread for tid %d. skipping sample.\n",
sample->tid);
}
save_task_callchain(sched, sample, evsel, machine);
if (sched->idle_hist) {
struct thread *idle;
struct idle_thread_runtime *itr;
idle = get_idle_thread(sample->cpu);
if (idle == NULL) {
pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu);
return NULL;
}
itr = thread__priv(idle);
if (itr == NULL)
return NULL;
thread__put(itr->last_thread);
itr->last_thread = thread__get(thread);
if (evsel__intval(evsel, sample, "next_pid") == 0)
save_idle_callchain(sched, itr, sample);
}
}
return thread;
}
static bool timehist_skip_sample(struct perf_sched *sched,
struct thread *thread,
struct evsel *evsel,
struct perf_sample *sample)
{
bool rc = false;
int prio = -1;
struct thread_runtime *tr = NULL;
if (thread__is_filtered(thread)) {
rc = true;
sched->skipped_samples++;
}
if (sched->prio_str) {
tr = thread__get_runtime(thread);
if (tr && tr->prio != -1)
prio = tr->prio;
else if (evsel__name_is(evsel, "sched:sched_switch"))
prio = evsel__intval(evsel, sample, "prev_prio");
if (prio != -1 && !test_bit(prio, sched->prio_bitmap)) {
rc = true;
sched->skipped_samples++;
}
}
if (sched->idle_hist) {
if (!evsel__name_is(evsel, "sched:sched_switch"))
rc = true;
else if (evsel__intval(evsel, sample, "prev_pid") != 0 &&
evsel__intval(evsel, sample, "next_pid") != 0)
rc = true;
}
return rc;
}
static void timehist_print_wakeup_event(struct perf_sched *sched,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine,
struct thread *awakened)
{
struct thread *thread;
char tstr[64];
thread = machine__findnew_thread(machine, sample->pid, sample->tid);
if (thread == NULL)
return;
if (timehist_skip_sample(sched, thread, evsel, sample) &&
timehist_skip_sample(sched, awakened, evsel, sample)) {
thread__put(thread);
return;
}
timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
printf("%15s [%04d] ", tstr, sample->cpu);
if (sched->show_cpu_visual)
printf(" %*s ", sched->max_cpu.cpu + 1, "");
printf(" %-*s ", comm_width, timehist_get_commstr(thread));
printf(" %9s %9s %9s ", "", "", "");
printf("awakened: %s", timehist_get_commstr(awakened));
printf("\n");
thread__put(thread);
}
static int timehist_sched_wakeup_ignore(const struct perf_tool *tool __maybe_unused,
union perf_event *event __maybe_unused,
struct evsel *evsel __maybe_unused,
struct perf_sample *sample __maybe_unused,
struct machine *machine __maybe_unused)
{
return 0;
}
static int timehist_sched_wakeup_event(const struct perf_tool *tool,
union perf_event *event __maybe_unused,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
struct thread *thread;
struct thread_runtime *tr = NULL;
const u32 pid = evsel__intval(evsel, sample, "pid");
thread = machine__findnew_thread(machine, 0, pid);
if (thread == NULL)
return -1;
tr = thread__get_runtime(thread);
if (tr == NULL) {
thread__put(thread);
return -1;
}
if (tr->ready_to_run == 0)
tr->ready_to_run = sample->time;
if (sched->show_wakeups &&
!perf_time__skip_sample(&sched->ptime, sample->time))
timehist_print_wakeup_event(sched, evsel, sample, machine, thread);
thread__put(thread);
return 0;
}
static void timehist_print_migration_event(struct perf_sched *sched,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine,
struct thread *migrated)
{
struct thread *thread;
char tstr[64];
u32 max_cpus;
u32 ocpu, dcpu;
if (sched->summary_only)
return;
max_cpus = sched->max_cpu.cpu + 1;
ocpu = evsel__intval(evsel, sample, "orig_cpu");
dcpu = evsel__intval(evsel, sample, "dest_cpu");
thread = machine__findnew_thread(machine, sample->pid, sample->tid);
if (thread == NULL)
return;
if (timehist_skip_sample(sched, thread, evsel, sample) &&
timehist_skip_sample(sched, migrated, evsel, sample)) {
thread__put(thread);
return;
}
timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
printf("%15s [%04d] ", tstr, sample->cpu);
if (sched->show_cpu_visual) {
u32 i;
char c;
printf(" ");
for (i = 0; i < max_cpus; ++i) {
c = (i == sample->cpu) ? 'm' : ' ';
printf("%c", c);
}
printf(" ");
}
printf(" %-*s ", comm_width, timehist_get_commstr(thread));
printf(" %9s %9s %9s ", "", "", "");
printf("migrated: %s", timehist_get_commstr(migrated));
printf(" cpu %d => %d", ocpu, dcpu);
printf("\n");
thread__put(thread);
}
static int timehist_migrate_task_event(const struct perf_tool *tool,
union perf_event *event __maybe_unused,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
struct thread *thread;
struct thread_runtime *tr = NULL;
const u32 pid = evsel__intval(evsel, sample, "pid");
thread = machine__findnew_thread(machine, 0, pid);
if (thread == NULL)
return -1;
tr = thread__get_runtime(thread);
if (tr == NULL) {
thread__put(thread);
return -1;
}
tr->migrations++;
tr->migrated = sample->time;
if (sched->show_migrations) {
timehist_print_migration_event(sched, evsel, sample,
machine, thread);
}
thread__put(thread);
return 0;
}
static void timehist_update_task_prio(struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine)
{
struct thread *thread;
struct thread_runtime *tr = NULL;
const u32 next_pid = evsel__intval(evsel, sample, "next_pid");
const u32 next_prio = evsel__intval(evsel, sample, "next_prio");
if (next_pid == 0)
thread = get_idle_thread(sample->cpu);
else
thread = machine__findnew_thread(machine, -1, next_pid);
if (thread == NULL)
return;
tr = thread__get_runtime(thread);
if (tr != NULL)
tr->prio = next_prio;
thread__put(thread);
}
static int timehist_sched_change_event(const struct perf_tool *tool,
union perf_event *event,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine)
{
struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
struct perf_time_interval *ptime = &sched->ptime;
struct addr_location al;
struct thread *thread = NULL;
struct thread_runtime *tr = NULL;
u64 tprev, t = sample->time;
int rc = 0;
const char state = evsel__taskstate(evsel, sample, "prev_state");
addr_location__init(&al);
if (machine__resolve(machine, &al, sample) < 0) {
pr_err("problem processing %d event. skipping it\n",
event->header.type);
rc = -1;
goto out;
}
if (sched->show_prio || sched->prio_str)
timehist_update_task_prio(evsel, sample, machine);
thread = timehist_get_thread(sched, sample, machine, evsel);
if (thread == NULL) {
rc = -1;
goto out;
}
if (timehist_skip_sample(sched, thread, evsel, sample))
goto out;
tr = thread__get_runtime(thread);
if (tr == NULL) {
rc = -1;
goto out;
}
tprev = evsel__get_time(evsel, sample->cpu);
if (ptime->start && ptime->start > t)
goto out;
if (tprev && ptime->start > tprev)
tprev = ptime->start;
if (ptime->end) {
if (!tprev || tprev > ptime->end)
goto out;
if (t > ptime->end)
t = ptime->end;
}
if (!sched->idle_hist || thread__tid(thread) == 0) {
if (!cpu_list || test_bit(sample->cpu, cpu_bitmap))
timehist_update_runtime_stats(tr, t, tprev);
if (sched->idle_hist) {
struct idle_thread_runtime *itr = (void *)tr;
struct thread_runtime *last_tr;
if (itr->last_thread == NULL)
goto out;
last_tr = thread__get_runtime(itr->last_thread);
if (last_tr == NULL)
goto out;
timehist_update_runtime_stats(last_tr, t, tprev);
last_tr->dt_run = 0;
last_tr->dt_delay = 0;
last_tr->dt_sleep = 0;
last_tr->dt_iowait = 0;
last_tr->dt_preempt = 0;
if (itr->cursor.nr)
callchain_append(&itr->callchain, &itr->cursor, t - tprev);
itr->last_thread = NULL;
}
if (!sched->summary_only)
timehist_print_sample(sched, evsel, sample, &al, thread, t, state);
}
out:
if (sched->hist_time.start == 0 && t >= ptime->start)
sched->hist_time.start = t;
if (ptime->end == 0 || t <= ptime->end)
sched->hist_time.end = t;
if (tr) {
tr->last_time = sample->time;
tr->last_state = state;
if (state == 'R')
tr->ready_to_run = t;
else
tr->ready_to_run = 0;
tr->migrated = 0;
}
evsel__save_time(evsel, sample->time, sample->cpu);
thread__put(thread);
addr_location__exit(&al);
return rc;
}
static int timehist_sched_switch_event(const struct perf_tool *tool,
union perf_event *event,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine __maybe_unused)
{
return timehist_sched_change_event(tool, event, evsel, sample, machine);
}
static int process_lost(const struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample,
struct machine *machine __maybe_unused)
{
char tstr[64];
timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
printf("%15s ", tstr);
printf("lost %" PRI_lu64 " events on cpu %d\n", event->lost.lost, sample->cpu);
return 0;
}
static void print_thread_runtime(struct thread *t,
struct thread_runtime *r)
{
double mean = avg_stats(&r->run_stats);
float stddev;
printf("%*s %5d %9" PRIu64 " ",
comm_width, timehist_get_commstr(t), thread__ppid(t),
(u64) r->run_stats.n);
print_sched_time(r->total_run_time, 8);
stddev = rel_stddev_stats(stddev_stats(&r->run_stats), mean);
print_sched_time(r->run_stats.min, 6);
printf(" ");
print_sched_time((u64) mean, 6);
printf(" ");
print_sched_time(r->run_stats.max, 6);
printf(" ");
printf("%5.2f", stddev);
printf(" %5" PRIu64, r->migrations);
printf("\n");
}
static void print_thread_waittime(struct thread *t,
struct thread_runtime *r)
{
printf("%*s %5d %9" PRIu64 " ",
comm_width, timehist_get_commstr(t), thread__ppid(t),
(u64) r->run_stats.n);
print_sched_time(r->total_run_time, 8);
print_sched_time(r->total_sleep_time, 6);
printf(" ");
print_sched_time(r->total_iowait_time, 6);
printf(" ");
print_sched_time(r->total_preempt_time, 6);
printf(" ");
print_sched_time(r->total_delay_time, 6);
printf("\n");
}
struct total_run_stats {
struct perf_sched *sched;
u64 sched_count;
u64 task_count;
u64 total_run_time;
};
static int show_thread_runtime(struct thread *t, void *priv)
{
struct total_run_stats *stats = priv;
struct thread_runtime *r;
if (thread__is_filtered(t))
return 0;
r = thread__priv(t);
if (r && r->run_stats.n) {
stats->task_count++;
stats->sched_count += r->run_stats.n;
stats->total_run_time += r->total_run_time;
if (stats->sched->show_state)
print_thread_waittime(t, r);
else
print_thread_runtime(t, r);
}
return 0;
}
static size_t callchain__fprintf_folded(FILE *fp, struct callchain_node *node)
{
const char *sep = " <- ";
struct callchain_list *chain;
size_t ret = 0;
char bf[1024];
bool first;
if (node == NULL)
return 0;
ret = callchain__fprintf_folded(fp, node->parent);
first = (ret == 0);
list_for_each_entry(chain, &node->val, list) {
if (chain->ip >= PERF_CONTEXT_MAX)
continue;
if (chain->ms.sym && chain->ms.sym->ignore)
continue;
ret += fprintf(fp, "%s%s", first ? "" : sep,
callchain_list__sym_name(chain, bf, sizeof(bf),
false));
first = false;
}
return ret;
}
static size_t timehist_print_idlehist_callchain(struct rb_root_cached *root)
{
size_t ret = 0;
FILE *fp = stdout;
struct callchain_node *chain;
struct rb_node *rb_node = rb_first_cached(root);
printf(" %16s %8s %s\n", "Idle time (msec)", "Count", "Callchains");
printf(" %.16s %.8s %.50s\n", graph_dotted_line, graph_dotted_line,
graph_dotted_line);
while (rb_node) {
chain = rb_entry(rb_node, struct callchain_node, rb_node);
rb_node = rb_next(rb_node);
ret += fprintf(fp, " ");
print_sched_time(chain->hit, 12);
ret += 16;
ret += fprintf(fp, " %8d ", chain->count);
ret += callchain__fprintf_folded(fp, chain);
ret += fprintf(fp, "\n");
}
return ret;
}
static void timehist_print_summary(struct perf_sched *sched,
struct perf_session *session)
{
struct machine *m = &session->machines.host;
struct total_run_stats totals;
u64 task_count;
struct thread *t;
struct thread_runtime *r;
int i;
u64 hist_time = sched->hist_time.end - sched->hist_time.start;
memset(&totals, 0, sizeof(totals));
totals.sched = sched;
if (sched->idle_hist) {
printf("\nIdle-time summary\n");
printf("%*s parent sched-out ", comm_width, "comm");
printf(" idle-time min-idle avg-idle max-idle stddev migrations\n");
} else if (sched->show_state) {
printf("\nWait-time summary\n");
printf("%*s parent sched-in ", comm_width, "comm");
printf(" run-time sleep iowait preempt delay\n");
} else {
printf("\nRuntime summary\n");
printf("%*s parent sched-in ", comm_width, "comm");
printf(" run-time min-run avg-run max-run stddev migrations\n");
}
printf("%*s (count) ", comm_width, "");
printf(" (msec) (msec) (msec) (msec) %s\n",
sched->show_state ? "(msec)" : "%");
printf("%.117s\n", graph_dotted_line);
machine__for_each_thread(m, show_thread_runtime, &totals);
task_count = totals.task_count;
if (!task_count)
printf("<no still running tasks>\n");
if (sched->skipped_samples && !sched->idle_hist)
return;
printf("\nIdle stats:\n");
for (i = 0; i < idle_max_cpu; ++i) {
if (cpu_list && !test_bit(i, cpu_bitmap))
continue;
t = idle_threads[i];
if (!t)
continue;
r = thread__priv(t);
if (r && r->run_stats.n) {
totals.sched_count += r->run_stats.n;
printf(" CPU %2d idle for ", i);
print_sched_time(r->total_run_time, 6);
printf(" msec (%6.2f%%)\n", 100.0 * r->total_run_time / hist_time);
} else
printf(" CPU %2d idle entire time window\n", i);
}
if (sched->idle_hist && sched->show_callchain) {
callchain_param.mode = CHAIN_FOLDED;
callchain_param.value = CCVAL_PERIOD;
callchain_register_param(&callchain_param);
printf("\nIdle stats by callchain:\n");
for (i = 0; i < idle_max_cpu; ++i) {
struct idle_thread_runtime *itr;
t = idle_threads[i];
if (!t)
continue;
itr = thread__priv(t);
if (itr == NULL)
continue;
callchain_param.sort(&itr->sorted_root.rb_root, &itr->callchain,
0, &callchain_param);
printf(" CPU %2d:", i);
print_sched_time(itr->tr.total_run_time, 6);
printf(" msec\n");
timehist_print_idlehist_callchain(&itr->sorted_root);
printf("\n");
}
}
printf("\n"
" Total number of unique tasks: %" PRIu64 "\n"
"Total number of context switches: %" PRIu64 "\n",
totals.task_count, totals.sched_count);
printf(" Total run time (msec): ");
print_sched_time(totals.total_run_time, 2);
printf("\n");
printf(" Total scheduling time (msec): ");
print_sched_time(hist_time, 2);
printf(" (x %d)\n", sched->max_cpu.cpu);
}
typedef int (*sched_handler)(const struct perf_tool *tool,
union perf_event *event,
struct evsel *evsel,
struct perf_sample *sample,
struct machine *machine);
static int perf_timehist__process_sample(const struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample,
struct evsel *evsel,
struct machine *machine)
{
struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
int err = 0;
struct perf_cpu this_cpu = {
.cpu = sample->cpu,
};
if (this_cpu.cpu > sched->max_cpu.cpu)
sched->max_cpu = this_cpu;
if (evsel->handler != NULL) {
sched_handler f = evsel->handler;
err = f(tool, event, evsel, sample, machine);
}
return err;
}
static int timehist_check_attr(struct perf_sched *sched,
struct evlist *evlist)
{
struct evsel *evsel;
struct evsel_runtime *er;
list_for_each_entry(evsel, &evlist->core.entries, core.node) {
er = evsel__get_runtime(evsel);
if (er == NULL) {
pr_err("Failed to allocate memory for evsel runtime data\n");
return -1;
}
if (sched->show_callchain &&
evsel__name_is(evsel, "sched:sched_switch") &&
!evsel__has_callchain(evsel)) {
pr_info("Samples of sched_switch event do not have callchains.\n");
sched->show_callchain = 0;
symbol_conf.use_callchain = 0;
}
}
return 0;
}
static int timehist_parse_prio_str(struct perf_sched *sched)
{
char *p;
unsigned long start_prio, end_prio;
const char *str = sched->prio_str;
if (!str)
return 0;
while (isdigit(*str)) {
p = NULL;
start_prio = strtoul(str, &p, 0);
if (start_prio >= MAX_PRIO || (*p != '\0' && *p != ',' && *p != '-'))
return -1;
if (*p == '-') {
str = ++p;
p = NULL;
end_prio = strtoul(str, &p, 0);
if (end_prio >= MAX_PRIO || (*p != '\0' && *p != ','))
return -1;
if (end_prio < start_prio)
return -1;
} else {
end_prio = start_prio;
}
for (; start_prio <= end_prio; start_prio++)
__set_bit(start_prio, sched->prio_bitmap);
if (*p)
++p;
str = p;
}
return 0;
}
static int perf_sched__timehist(struct perf_sched *sched)
{
struct evsel_str_handler handlers[] = {
{ "sched:sched_switch", timehist_sched_switch_event, },
{ "sched:sched_wakeup", timehist_sched_wakeup_event, },
{ "sched:sched_waking", timehist_sched_wakeup_event, },
{ "sched:sched_wakeup_new", timehist_sched_wakeup_event, },
};
const struct evsel_str_handler migrate_handlers[] = {
{ "sched:sched_migrate_task", timehist_migrate_task_event, },
};
struct perf_data data = {
.path = input_name,
.mode = PERF_DATA_MODE_READ,
.force = sched->force,
};
struct perf_session *session;
struct perf_env *env;
struct evlist *evlist;
int err = -1;
sched->tool.sample = perf_timehist__process_sample;
sched->tool.mmap = perf_event__process_mmap;
sched->tool.comm = perf_event__process_comm;
sched->tool.exit = perf_event__process_exit;
sched->tool.fork = perf_event__process_fork;
sched->tool.lost = process_lost;
sched->tool.attr = perf_event__process_attr;
sched->tool.tracing_data = perf_event__process_tracing_data;
sched->tool.build_id = perf_event__process_build_id;
sched->tool.ordering_requires_timestamps = true;
symbol_conf.use_callchain = sched->show_callchain;
session = perf_session__new(&data, &sched->tool);
if (IS_ERR(session))
return PTR_ERR(session);
env = perf_session__env(session);
if (cpu_list) {
err = perf_session__cpu_bitmap(session, cpu_list, cpu_bitmap);
if (err < 0)
goto out;
}
evlist = session->evlist;
symbol__init(env);
if (perf_time__parse_str(&sched->ptime, sched->time_str) != 0) {
pr_err("Invalid time string\n");
err = -EINVAL;
goto out;
}
if (timehist_check_attr(sched, evlist) != 0)
goto out;
if (timehist_parse_prio_str(sched) != 0) {
pr_err("Invalid prio string\n");
goto out;
}
setup_pager();
evsel__set_priv_destructor(timehist__evsel_priv_destructor);
if (evlist__find_tracepoint_by_name(session->evlist, "sched:sched_waking"))
handlers[1].handler = timehist_sched_wakeup_ignore;
if (perf_session__set_tracepoints_handlers(session, handlers))
goto out;
if (!evlist__find_tracepoint_by_name(session->evlist, "sched:sched_switch")) {
pr_err("No sched_switch events found. Have you run 'perf sched record'?\n");
goto out;
}
if ((sched->show_migrations || sched->pre_migrations) &&
perf_session__set_tracepoints_handlers(session, migrate_handlers))
goto out;
sched->max_cpu.cpu = env->nr_cpus_online;
if (sched->max_cpu.cpu == 0)
sched->max_cpu.cpu = 4;
if (init_idle_threads(sched->max_cpu.cpu))
goto out;
if (sched->summary_only)
sched->summary = sched->summary_only;
if (!sched->summary_only)
timehist_header(sched);
err = perf_session__process_events(session);
if (err) {
pr_err("Failed to process events, error %d", err);
goto out;
}
sched->nr_events = evlist->stats.nr_events[0];
sched->nr_lost_events = evlist->stats.total_lost;
sched->nr_lost_chunks = evlist->stats.nr_events[PERF_RECORD_LOST];
if (sched->summary)
timehist_print_summary(sched, session);
out:
free_idle_threads();
perf_session__delete(session);
return err;
}
static void print_bad_events(struct perf_sched *sched)
{
if (sched->nr_unordered_timestamps && sched->nr_timestamps) {
printf(" INFO: %.3f%% unordered timestamps (%ld out of %ld)\n",
(double)sched->nr_unordered_timestamps/(double)sched->nr_timestamps*100.0,
sched->nr_unordered_timestamps, sched->nr_timestamps);
}
if (sched->nr_lost_events && sched->nr_events) {
printf(" INFO: %.3f%% lost events (%ld out of %ld, in %ld chunks)\n",
(double)sched->nr_lost_events/(double)sched->nr_events * 100.0,
sched->nr_lost_events, sched->nr_events, sched->nr_lost_chunks);
}
if (sched->nr_context_switch_bugs && sched->nr_timestamps) {
printf(" INFO: %.3f%% context switch bugs (%ld out of %ld)",
(double)sched->nr_context_switch_bugs/(double)sched->nr_timestamps*100.0,
sched->nr_context_switch_bugs, sched->nr_timestamps);
if (sched->nr_lost_events)
printf(" (due to lost events?)");
printf("\n");
}
}
static void __merge_work_atoms(struct rb_root_cached *root, struct work_atoms *data)
{
struct rb_node **new = &(root->rb_root.rb_node), *parent = NULL;
struct work_atoms *this;
const char *comm = thread__comm_str(data->thread), *this_comm;
bool leftmost = true;
while (*new) {
int cmp;
this = container_of(*new, struct work_atoms, node);
parent = *new;
this_comm = thread__comm_str(this->thread);
cmp = strcmp(comm, this_comm);
if (cmp > 0) {
new = &((*new)->rb_left);
} else if (cmp < 0) {
new = &((*new)->rb_right);
leftmost = false;
} else {
this->num_merged++;
this->total_runtime += data->total_runtime;
this->nb_atoms += data->nb_atoms;
this->total_lat += data->total_lat;
list_splice_init(&data->work_list, &this->work_list);
if (this->max_lat < data->max_lat) {
this->max_lat = data->max_lat;
this->max_lat_start = data->max_lat_start;
this->max_lat_end = data->max_lat_end;
}
free_work_atoms(data);
return;
}
}
data->num_merged++;
rb_link_node(&data->node, parent, new);
rb_insert_color_cached(&data->node, root, leftmost);
}
static void perf_sched__merge_lat(struct perf_sched *sched)
{
struct work_atoms *data;
struct rb_node *node;
if (sched->skip_merge)
return;
while ((node = rb_first_cached(&sched->atom_root))) {
rb_erase_cached(node, &sched->atom_root);
data = rb_entry(node, struct work_atoms, node);
__merge_work_atoms(&sched->merged_atom_root, data);
}
}
static int setup_cpus_switch_event(struct perf_sched *sched)
{
unsigned int i;
sched->cpu_last_switched = calloc(MAX_CPUS, sizeof(*(sched->cpu_last_switched)));
if (!sched->cpu_last_switched)
return -1;
sched->curr_pid = malloc(MAX_CPUS * sizeof(*(sched->curr_pid)));
if (!sched->curr_pid) {
zfree(&sched->cpu_last_switched);
return -1;
}
for (i = 0; i < MAX_CPUS; i++)
sched->curr_pid[i] = -1;
return 0;
}
static void free_cpus_switch_event(struct perf_sched *sched)
{
zfree(&sched->curr_pid);
zfree(&sched->cpu_last_switched);
}
static int perf_sched__lat(struct perf_sched *sched)
{
int rc = -1;
struct rb_node *next;
setup_pager();
if (setup_cpus_switch_event(sched))
return rc;
if (perf_sched__read_events(sched))
goto out_free_cpus_switch_event;
perf_sched__merge_lat(sched);
perf_sched__sort_lat(sched);
printf("\n -------------------------------------------------------------------------------------------------------------------------------------------\n");
printf(" Task | Runtime ms | Count | Avg delay ms | Max delay ms | Max delay start | Max delay end |\n");
printf(" -------------------------------------------------------------------------------------------------------------------------------------------\n");
next = rb_first_cached(&sched->sorted_atom_root);
while (next) {
struct work_atoms *work_list;
work_list = rb_entry(next, struct work_atoms, node);
output_lat_thread(sched, work_list);
next = rb_next(next);
}
printf(" -----------------------------------------------------------------------------------------------------------------\n");
printf(" TOTAL: |%11.3f ms |%9" PRIu64 " |\n",
(double)sched->all_runtime / NSEC_PER_MSEC, sched->all_count);
printf(" ---------------------------------------------------\n");
print_bad_events(sched);
printf("\n");
rc = 0;
while ((next = rb_first_cached(&sched->sorted_atom_root))) {
struct work_atoms *data;
data = rb_entry(next, struct work_atoms, node);
rb_erase_cached(next, &sched->sorted_atom_root);
free_work_atoms(data);
}
out_free_cpus_switch_event:
free_cpus_switch_event(sched);
return rc;
}
static int setup_map_cpus(struct perf_sched *sched)
{
sched->max_cpu.cpu = sysconf(_SC_NPROCESSORS_CONF);
if (sched->map.comp) {
sched->map.comp_cpus = zalloc(sched->max_cpu.cpu * sizeof(int));
if (!sched->map.comp_cpus)
return -1;
}
if (sched->map.cpus_str) {
sched->map.cpus = perf_cpu_map__new(sched->map.cpus_str);
if (!sched->map.cpus) {
pr_err("failed to get cpus map from %s\n", sched->map.cpus_str);
zfree(&sched->map.comp_cpus);
return -1;
}
}
return 0;
}
static int setup_color_pids(struct perf_sched *sched)
{
struct perf_thread_map *map;
if (!sched->map.color_pids_str)
return 0;
map = thread_map__new_by_tid_str(sched->map.color_pids_str);
if (!map) {
pr_err("failed to get thread map from %s\n", sched->map.color_pids_str);
return -1;
}
sched->map.color_pids = map;
return 0;
}
static int setup_color_cpus(struct perf_sched *sched)
{
struct perf_cpu_map *map;
if (!sched->map.color_cpus_str)
return 0;
map = perf_cpu_map__new(sched->map.color_cpus_str);
if (!map) {
pr_err("failed to get thread map from %s\n", sched->map.color_cpus_str);
return -1;
}
sched->map.color_cpus = map;
return 0;
}
static int perf_sched__map(struct perf_sched *sched)
{
int rc = -1;
sched->curr_thread = calloc(MAX_CPUS, sizeof(*(sched->curr_thread)));
if (!sched->curr_thread)
return rc;
sched->curr_out_thread = calloc(MAX_CPUS, sizeof(*(sched->curr_out_thread)));
if (!sched->curr_out_thread)
goto out_free_curr_thread;
if (setup_cpus_switch_event(sched))
goto out_free_curr_out_thread;
if (setup_map_cpus(sched))
goto out_free_cpus_switch_event;
if (setup_color_pids(sched))
goto out_put_map_cpus;
if (setup_color_cpus(sched))
goto out_put_color_pids;
setup_pager();
if (perf_sched__read_events(sched))
goto out_put_color_cpus;
rc = 0;
print_bad_events(sched);
out_put_color_cpus:
perf_cpu_map__put(sched->map.color_cpus);
out_put_color_pids:
perf_thread_map__put(sched->map.color_pids);
out_put_map_cpus:
zfree(&sched->map.comp_cpus);
perf_cpu_map__put(sched->map.cpus);
out_free_cpus_switch_event:
free_cpus_switch_event(sched);
out_free_curr_out_thread:
for (int i = 0; i < MAX_CPUS; i++)
thread__put(sched->curr_out_thread[i]);
zfree(&sched->curr_out_thread);
out_free_curr_thread:
for (int i = 0; i < MAX_CPUS; i++)
thread__put(sched->curr_thread[i]);
zfree(&sched->curr_thread);
return rc;
}
static int perf_sched__replay(struct perf_sched *sched)
{
int ret;
unsigned long i;
mutex_init(&sched->start_work_mutex);
mutex_init(&sched->work_done_wait_mutex);
ret = setup_cpus_switch_event(sched);
if (ret)
goto out_mutex_destroy;
calibrate_run_measurement_overhead(sched);
calibrate_sleep_measurement_overhead(sched);
test_calibrations(sched);
ret = perf_sched__read_events(sched);
if (ret)
goto out_free_cpus_switch_event;
printf("nr_run_events: %ld\n", sched->nr_run_events);
printf("nr_sleep_events: %ld\n", sched->nr_sleep_events);
printf("nr_wakeup_events: %ld\n", sched->nr_wakeup_events);
if (sched->targetless_wakeups)
printf("target-less wakeups: %ld\n", sched->targetless_wakeups);
if (sched->multitarget_wakeups)
printf("multi-target wakeups: %ld\n", sched->multitarget_wakeups);
if (sched->nr_run_events_optimized)
printf("run atoms optimized: %ld\n",
sched->nr_run_events_optimized);
print_task_traces(sched);
add_cross_task_wakeups(sched);
sched->thread_funcs_exit = false;
create_tasks(sched);
printf("------------------------------------------------------------\n");
if (sched->replay_repeat == 0)
sched->replay_repeat = UINT_MAX;
for (i = 0; i < sched->replay_repeat; i++)
run_one_test(sched);
sched->thread_funcs_exit = true;
destroy_tasks(sched);
out_free_cpus_switch_event:
free_cpus_switch_event(sched);
out_mutex_destroy:
mutex_destroy(&sched->start_work_mutex);
mutex_destroy(&sched->work_done_wait_mutex);
return ret;
}
static void setup_sorting(struct perf_sched *sched, const struct option *options,
const char * const usage_msg[])
{
char *tmp, *tok, *str = strdup(sched->sort_order);
for (tok = strtok_r(str, ", ", &tmp);
tok; tok = strtok_r(NULL, ", ", &tmp)) {
if (sort_dimension__add(tok, &sched->sort_list) < 0) {
usage_with_options_msg(usage_msg, options,
"Unknown --sort key: `%s'", tok);
}
}
free(str);
sort_dimension__add("pid", &sched->cmp_pid);
}
static int process_synthesized_schedstat_event(const struct perf_tool *tool,
union perf_event *event,
struct perf_sample *sample __maybe_unused,
struct machine *machine __maybe_unused)
{
struct perf_sched *sched = container_of(tool, struct perf_sched, tool);
if (perf_data__write(sched->data, event, event->header.size) <= 0) {
pr_err("failed to write perf data, error: %m\n");
return -1;
}
sched->session->header.data_size += event->header.size;
return 0;
}
static void sighandler(int sig __maybe_unused)
{
}
static int enable_sched_schedstats(int *reset)
{
char path[PATH_MAX];
FILE *fp;
char ch;
snprintf(path, PATH_MAX, "%s/sys/kernel/sched_schedstats", procfs__mountpoint());
fp = fopen(path, "w+");
if (!fp) {
pr_err("Failed to open %s\n", path);
return -1;
}
ch = getc(fp);
if (ch == '0') {
*reset = 1;
rewind(fp);
putc('1', fp);
fclose(fp);
}
return 0;
}
static int disable_sched_schedstat(void)
{
char path[PATH_MAX];
FILE *fp;
snprintf(path, PATH_MAX, "%s/sys/kernel/sched_schedstats", procfs__mountpoint());
fp = fopen(path, "w");
if (!fp) {
pr_err("Failed to open %s\n", path);
return -1;
}
putc('0', fp);
fclose(fp);
return 0;
}
const char *output_name;
static int perf_sched__schedstat_record(struct perf_sched *sched,
int argc, const char **argv)
{
struct perf_session *session;
struct target target = {};
struct evlist *evlist;
int reset = 0;
int err = 0;
int fd;
struct perf_data data = {
.path = output_name,
.mode = PERF_DATA_MODE_WRITE,
};
signal(SIGINT, sighandler);
signal(SIGCHLD, sighandler);
signal(SIGTERM, sighandler);
evlist = evlist__new();
if (!evlist)
return -ENOMEM;
session = perf_session__new(&data, &sched->tool);
if (IS_ERR(session)) {
pr_err("Perf session creation failed.\n");
evlist__delete(evlist);
return PTR_ERR(session);
}
session->evlist = evlist;
sched->session = session;
sched->data = &data;
fd = perf_data__fd(&data);
perf_header__set_feat(&session->header, HEADER_HOSTNAME);
perf_header__set_feat(&session->header, HEADER_OSRELEASE);
perf_header__set_feat(&session->header, HEADER_VERSION);
perf_header__set_feat(&session->header, HEADER_ARCH);
perf_header__set_feat(&session->header, HEADER_NRCPUS);
perf_header__set_feat(&session->header, HEADER_CPUDESC);
perf_header__set_feat(&session->header, HEADER_CPUID);
perf_header__set_feat(&session->header, HEADER_TOTAL_MEM);
perf_header__set_feat(&session->header, HEADER_CMDLINE);
perf_header__set_feat(&session->header, HEADER_CPU_TOPOLOGY);
perf_header__set_feat(&session->header, HEADER_NUMA_TOPOLOGY);
perf_header__set_feat(&session->header, HEADER_CACHE);
perf_header__set_feat(&session->header, HEADER_MEM_TOPOLOGY);
perf_header__set_feat(&session->header, HEADER_HYBRID_TOPOLOGY);
perf_header__set_feat(&session->header, HEADER_CPU_DOMAIN_INFO);
err = perf_session__write_header(session, evlist, fd, false);
if (err < 0)
goto out;
if (cpu_list)
target.cpu_list = cpu_list;
else
target.system_wide = true;
if (argc) {
err = evlist__prepare_workload(evlist, &target, argv, false, NULL);
if (err)
goto out;
}
err = evlist__create_maps(evlist, &target);
if (err < 0)
goto out;
user_requested_cpus = evlist->core.user_requested_cpus;
err = perf_event__synthesize_schedstat(&(sched->tool),
process_synthesized_schedstat_event,
user_requested_cpus);
if (err < 0)
goto out;
err = enable_sched_schedstats(&reset);
if (err < 0)
goto out;
if (argc)
evlist__start_workload(evlist);
pause();
if (reset) {
err = disable_sched_schedstat();
if (err < 0)
goto out;
}
err = perf_event__synthesize_schedstat(&(sched->tool),
process_synthesized_schedstat_event,
user_requested_cpus);
if (err < 0)
goto out;
err = perf_session__write_header(session, evlist, fd, true);
out:
if (!err)
fprintf(stderr, "[ perf sched stats: Wrote samples to %s ]\n", data.path);
else
fprintf(stderr, "[ perf sched stats: Failed !! ]\n");
evlist__delete(evlist);
close(fd);
return err;
}
struct schedstat_domain {
struct list_head domain_list;
struct perf_record_schedstat_domain *domain_data;
};
struct schedstat_cpu {
struct list_head cpu_list;
struct list_head domain_head;
struct perf_record_schedstat_cpu *cpu_data;
};
static struct list_head cpu_head = LIST_HEAD_INIT(cpu_head);
static struct schedstat_cpu *cpu_second_pass;
static struct schedstat_domain *domain_second_pass;
static bool after_workload_flag;
static bool verbose_field;
static void store_schedstat_cpu_diff(struct schedstat_cpu *after_workload)
{
struct perf_record_schedstat_cpu *before = cpu_second_pass->cpu_data;
struct perf_record_schedstat_cpu *after = after_workload->cpu_data;
__u16 version = after_workload->cpu_data->version;
#define CPU_FIELD(_type, _name, _desc, _format, _is_pct, _pct_of, _ver) \
(before->_ver._name = after->_ver._name - before->_ver._name)
if (version == 15) {
#include <perf/schedstat-v15.h>
} else if (version == 16) {
#include <perf/schedstat-v16.h>
} else if (version == 17) {
#include <perf/schedstat-v17.h>
}
#undef CPU_FIELD
}
static void store_schedstat_domain_diff(struct schedstat_domain *after_workload)
{
struct perf_record_schedstat_domain *before = domain_second_pass->domain_data;
struct perf_record_schedstat_domain *after = after_workload->domain_data;
__u16 version = after_workload->domain_data->version;
#define DOMAIN_FIELD(_type, _name, _desc, _format, _is_jiffies, _ver) \
(before->_ver._name = after->_ver._name - before->_ver._name)
if (version == 15) {
#include <perf/schedstat-v15.h>
} else if (version == 16) {
#include <perf/schedstat-v16.h>
} else if (version == 17) {
#include <perf/schedstat-v17.h>
}
#undef DOMAIN_FIELD
}
#define PCT_CHNG(_x, _y) ((_x) ? ((double)((double)(_y) - (_x)) / (_x)) * 100 : 0.0)
static inline void print_cpu_stats(struct perf_record_schedstat_cpu *cs1,
struct perf_record_schedstat_cpu *cs2)
{
printf("%-65s ", "DESC");
if (!cs2)
printf("%12s %12s", "COUNT", "PCT_CHANGE");
else
printf("%12s %11s %12s %14s %10s", "COUNT1", "COUNT2", "PCT_CHANGE",
"PCT_CHANGE1", "PCT_CHANGE2");
printf("\n");
print_separator2(SEP_LEN, "", 0);
#define CALC_PCT(_x, _y) ((_y) ? ((double)(_x) / (_y)) * 100 : 0.0)
#define CPU_FIELD(_type, _name, _desc, _format, _is_pct, _pct_of, _ver) \
do { \
printf("%-65s: " _format, verbose_field ? _desc : #_name, \
cs1->_ver._name); \
if (!cs2) { \
if (_is_pct) \
printf(" ( %8.2lf%% )", \
CALC_PCT(cs1->_ver._name, cs1->_ver._pct_of)); \
} else { \
printf("," _format " | %8.2lf%% |", cs2->_ver._name, \
PCT_CHNG(cs1->_ver._name, cs2->_ver._name)); \
if (_is_pct) \
printf(" ( %8.2lf%%, %8.2lf%% )", \
CALC_PCT(cs1->_ver._name, cs1->_ver._pct_of), \
CALC_PCT(cs2->_ver._name, cs2->_ver._pct_of)); \
} \
printf("\n"); \
} while (0)
if (cs1->version == 15) {
#include <perf/schedstat-v15.h>
} else if (cs1->version == 16) {
#include <perf/schedstat-v16.h>
} else if (cs1->version == 17) {
#include <perf/schedstat-v17.h>
}
#undef CPU_FIELD
#undef CALC_PCT
}
static inline void print_domain_stats(struct perf_record_schedstat_domain *ds1,
struct perf_record_schedstat_domain *ds2,
__u64 jiffies1, __u64 jiffies2)
{
printf("%-65s ", "DESC");
if (!ds2)
printf("%12s %14s", "COUNT", "AVG_JIFFIES");
else
printf("%12s %11s %12s %16s %12s", "COUNT1", "COUNT2", "PCT_CHANGE",
"AVG_JIFFIES1", "AVG_JIFFIES2");
printf("\n");
#define DOMAIN_CATEGORY(_desc) \
do { \
size_t _len = strlen(_desc); \
size_t _pre_dash_cnt = (SEP_LEN - _len) / 2; \
size_t _post_dash_cnt = SEP_LEN - _len - _pre_dash_cnt; \
print_separator2((int)_pre_dash_cnt, _desc, (int)_post_dash_cnt);\
} while (0)
#define CALC_AVG(_x, _y) ((_y) ? (long double)(_x) / (_y) : 0.0)
#define DOMAIN_FIELD(_type, _name, _desc, _format, _is_jiffies, _ver) \
do { \
printf("%-65s: " _format, verbose_field ? _desc : #_name, \
ds1->_ver._name); \
if (!ds2) { \
if (_is_jiffies) \
printf(" $ %11.2Lf $", \
CALC_AVG(jiffies1, ds1->_ver._name)); \
} else { \
printf("," _format " | %8.2lf%% |", ds2->_ver._name, \
PCT_CHNG(ds1->_ver._name, ds2->_ver._name)); \
if (_is_jiffies) \
printf(" $ %11.2Lf, %11.2Lf $", \
CALC_AVG(jiffies1, ds1->_ver._name), \
CALC_AVG(jiffies2, ds2->_ver._name)); \
} \
printf("\n"); \
} while (0)
#define DERIVED_CNT_FIELD(_name, _desc, _format, _x, _y, _z, _ver) \
do { \
__u32 t1 = ds1->_ver._x - ds1->_ver._y - ds1->_ver._z; \
printf("*%-64s: " _format, verbose_field ? _desc : #_name, t1); \
if (ds2) { \
__u32 t2 = ds2->_ver._x - ds2->_ver._y - ds2->_ver._z; \
printf("," _format " | %8.2lf%% |", t2, \
PCT_CHNG(t1, t2)); \
} \
printf("\n"); \
} while (0)
#define DERIVED_AVG_FIELD(_name, _desc, _format, _x, _y, _z, _w, _ver) \
do { \
__u32 t1 = ds1->_ver._x - ds1->_ver._y - ds1->_ver._z; \
printf("*%-64s: " _format, verbose_field ? _desc : #_name, \
CALC_AVG(ds1->_ver._w, t1)); \
if (ds2) { \
__u32 t2 = ds2->_ver._x - ds2->_ver._y - ds2->_ver._z; \
printf("," _format " | %8.2Lf%% |", \
CALC_AVG(ds2->_ver._w, t2), \
PCT_CHNG(CALC_AVG(ds1->_ver._w, t1), \
CALC_AVG(ds2->_ver._w, t2))); \
} \
printf("\n"); \
} while (0)
if (ds1->version == 15) {
#include <perf/schedstat-v15.h>
} else if (ds1->version == 16) {
#include <perf/schedstat-v16.h>
} else if (ds1->version == 17) {
#include <perf/schedstat-v17.h>
}
#undef DERIVED_AVG_FIELD
#undef DERIVED_CNT_FIELD
#undef DOMAIN_FIELD
#undef CALC_AVG
#undef DOMAIN_CATEGORY
}
#undef PCT_CHNG
static void summarize_schedstat_cpu(struct schedstat_cpu *summary_cpu,
struct schedstat_cpu *cptr,
int cnt, bool is_last)
{
struct perf_record_schedstat_cpu *summary_cs = summary_cpu->cpu_data,
*temp_cs = cptr->cpu_data;
#define CPU_FIELD(_type, _name, _desc, _format, _is_pct, _pct_of, _ver) \
do { \
summary_cs->_ver._name += temp_cs->_ver._name; \
if (is_last) \
summary_cs->_ver._name /= cnt; \
} while (0)
if (cptr->cpu_data->version == 15) {
#include <perf/schedstat-v15.h>
} else if (cptr->cpu_data->version == 16) {
#include <perf/schedstat-v16.h>
} else if (cptr->cpu_data->version == 17) {
#include <perf/schedstat-v17.h>
}
#undef CPU_FIELD
}
static void summarize_schedstat_domain(struct schedstat_domain *summary_domain,
struct schedstat_domain *dptr,
int cnt, bool is_last)
{
struct perf_record_schedstat_domain *summary_ds = summary_domain->domain_data,
*temp_ds = dptr->domain_data;
#define DOMAIN_FIELD(_type, _name, _desc, _format, _is_jiffies, _ver) \
do { \
summary_ds->_ver._name += temp_ds->_ver._name; \
if (is_last) \
summary_ds->_ver._name /= cnt; \
} while (0)
if (dptr->domain_data->version == 15) {
#include <perf/schedstat-v15.h>
} else if (dptr->domain_data->version == 16) {
#include <perf/schedstat-v16.h>
} else if (dptr->domain_data->version == 17) {
#include <perf/schedstat-v17.h>
}
#undef DOMAIN_FIELD
}
static int get_all_cpu_stats(struct list_head *head)
{
struct schedstat_cpu *cptr = list_first_entry(head, struct schedstat_cpu, cpu_list);
struct schedstat_cpu *summary_head = NULL;
struct perf_record_schedstat_domain *ds;
struct perf_record_schedstat_cpu *cs;
struct schedstat_domain *dptr, *tdptr;
bool is_last = false;
int cnt = 1;
int ret = 0;
if (cptr) {
summary_head = zalloc(sizeof(*summary_head));
if (!summary_head)
return -ENOMEM;
summary_head->cpu_data = zalloc(sizeof(*cs));
memcpy(summary_head->cpu_data, cptr->cpu_data, sizeof(*cs));
INIT_LIST_HEAD(&summary_head->domain_head);
list_for_each_entry(dptr, &cptr->domain_head, domain_list) {
tdptr = zalloc(sizeof(*tdptr));
if (!tdptr)
return -ENOMEM;
tdptr->domain_data = zalloc(sizeof(*ds));
if (!tdptr->domain_data)
return -ENOMEM;
memcpy(tdptr->domain_data, dptr->domain_data, sizeof(*ds));
list_add_tail(&tdptr->domain_list, &summary_head->domain_head);
}
}
list_for_each_entry(cptr, head, cpu_list) {
if (list_is_first(&cptr->cpu_list, head))
continue;
if (list_is_last(&cptr->cpu_list, head))
is_last = true;
cnt++;
summarize_schedstat_cpu(summary_head, cptr, cnt, is_last);
tdptr = list_first_entry(&summary_head->domain_head, struct schedstat_domain,
domain_list);
list_for_each_entry(dptr, &cptr->domain_head, domain_list) {
summarize_schedstat_domain(tdptr, dptr, cnt, is_last);
tdptr = list_next_entry(tdptr, domain_list);
}
}
list_add(&summary_head->cpu_list, head);
return ret;
}
static int show_schedstat_data(struct list_head *head1, struct cpu_domain_map **cd_map1,
struct list_head *head2, struct cpu_domain_map **cd_map2,
bool summary_only)
{
struct schedstat_cpu *cptr1 = list_first_entry(head1, struct schedstat_cpu, cpu_list);
struct perf_record_schedstat_domain *ds1 = NULL, *ds2 = NULL;
struct perf_record_schedstat_cpu *cs1 = NULL, *cs2 = NULL;
struct schedstat_domain *dptr1 = NULL, *dptr2 = NULL;
struct schedstat_cpu *cptr2 = NULL;
__u64 jiffies1 = 0, jiffies2 = 0;
bool is_summary = true;
int ret = 0;
printf("Description\n");
print_separator2(SEP_LEN, "", 0);
printf("%-30s-> %s\n", "DESC", "Description of the field");
printf("%-30s-> %s\n", "COUNT", "Value of the field");
printf("%-30s-> %s\n", "PCT_CHANGE", "Percent change with corresponding base value");
printf("%-30s-> %s\n", "AVG_JIFFIES",
"Avg time in jiffies between two consecutive occurrence of event");
print_separator2(SEP_LEN, "", 0);
printf("\n");
printf("%-65s: ", "Time elapsed (in jiffies)");
jiffies1 = cptr1->cpu_data->timestamp;
printf("%11llu", jiffies1);
if (head2) {
cptr2 = list_first_entry(head2, struct schedstat_cpu, cpu_list);
jiffies2 = cptr2->cpu_data->timestamp;
printf(",%11llu", jiffies2);
}
printf("\n");
ret = get_all_cpu_stats(head1);
if (cptr2) {
ret = get_all_cpu_stats(head2);
cptr2 = list_first_entry(head2, struct schedstat_cpu, cpu_list);
}
list_for_each_entry(cptr1, head1, cpu_list) {
struct cpu_domain_map *cd_info1 = NULL, *cd_info2 = NULL;
cs1 = cptr1->cpu_data;
cd_info1 = cd_map1[cs1->cpu];
if (cptr2) {
cs2 = cptr2->cpu_data;
cd_info2 = cd_map2[cs2->cpu];
dptr2 = list_first_entry(&cptr2->domain_head, struct schedstat_domain,
domain_list);
}
if (cs2 && cs1->cpu != cs2->cpu) {
pr_err("Failed because matching cpus not found for diff\n");
return -1;
}
if (cd_info2 && cd_info1->nr_domains != cd_info2->nr_domains) {
pr_err("Failed because nr_domains is not same for cpus\n");
return -1;
}
print_separator2(SEP_LEN, "", 0);
if (is_summary)
printf("CPU: <ALL CPUS SUMMARY>\n");
else
printf("CPU: %d\n", cs1->cpu);
print_separator2(SEP_LEN, "", 0);
print_cpu_stats(cs1, cs2);
print_separator2(SEP_LEN, "", 0);
list_for_each_entry(dptr1, &cptr1->domain_head, domain_list) {
struct domain_info *dinfo1 = NULL, *dinfo2 = NULL;
ds1 = dptr1->domain_data;
dinfo1 = cd_info1->domains[ds1->domain];
if (dptr2) {
ds2 = dptr2->domain_data;
dinfo2 = cd_info2->domains[ds2->domain];
}
if (dinfo2 && dinfo1->domain != dinfo2->domain) {
pr_err("Failed because matching domain not found for diff\n");
return -1;
}
if (is_summary) {
if (dinfo1->dname)
printf("CPU: <ALL CPUS SUMMARY> | DOMAIN: %s\n",
dinfo1->dname);
else
printf("CPU: <ALL CPUS SUMMARY> | DOMAIN: %d\n",
dinfo1->domain);
} else {
if (dinfo1->dname)
printf("CPU: %d | DOMAIN: %s | DOMAIN_CPUS: ",
cs1->cpu, dinfo1->dname);
else
printf("CPU: %d | DOMAIN: %d | DOMAIN_CPUS: ",
cs1->cpu, dinfo1->domain);
printf("%s\n", dinfo1->cpulist);
}
print_separator2(SEP_LEN, "", 0);
print_domain_stats(ds1, ds2, jiffies1, jiffies2);
print_separator2(SEP_LEN, "", 0);
if (dptr2)
dptr2 = list_next_entry(dptr2, domain_list);
}
if (summary_only)
break;
if (cptr2)
cptr2 = list_next_entry(cptr2, cpu_list);
is_summary = false;
}
return ret;
}
static int perf_sched__process_schedstat(const struct perf_tool *tool __maybe_unused,
struct perf_session *session __maybe_unused,
union perf_event *event)
{
struct perf_cpu this_cpu;
static __u32 initial_cpu;
switch (event->header.type) {
case PERF_RECORD_SCHEDSTAT_CPU:
this_cpu.cpu = event->schedstat_cpu.cpu;
break;
case PERF_RECORD_SCHEDSTAT_DOMAIN:
this_cpu.cpu = event->schedstat_domain.cpu;
break;
default:
return 0;
}
if (user_requested_cpus && !perf_cpu_map__has(user_requested_cpus, this_cpu))
return 0;
if (event->header.type == PERF_RECORD_SCHEDSTAT_CPU) {
struct schedstat_cpu *temp = zalloc(sizeof(*temp));
if (!temp)
return -ENOMEM;
temp->cpu_data = zalloc(sizeof(*temp->cpu_data));
if (!temp->cpu_data)
return -ENOMEM;
memcpy(temp->cpu_data, &event->schedstat_cpu, sizeof(*temp->cpu_data));
if (!list_empty(&cpu_head) && temp->cpu_data->cpu == initial_cpu)
after_workload_flag = true;
if (!after_workload_flag) {
if (list_empty(&cpu_head))
initial_cpu = temp->cpu_data->cpu;
list_add_tail(&temp->cpu_list, &cpu_head);
INIT_LIST_HEAD(&temp->domain_head);
} else {
if (temp->cpu_data->cpu == initial_cpu) {
cpu_second_pass = list_first_entry(&cpu_head, struct schedstat_cpu,
cpu_list);
cpu_second_pass->cpu_data->timestamp =
temp->cpu_data->timestamp - cpu_second_pass->cpu_data->timestamp;
} else {
cpu_second_pass = list_next_entry(cpu_second_pass, cpu_list);
}
domain_second_pass = list_first_entry(&cpu_second_pass->domain_head,
struct schedstat_domain, domain_list);
store_schedstat_cpu_diff(temp);
}
} else if (event->header.type == PERF_RECORD_SCHEDSTAT_DOMAIN) {
struct schedstat_cpu *cpu_tail;
struct schedstat_domain *temp = zalloc(sizeof(*temp));
if (!temp)
return -ENOMEM;
temp->domain_data = zalloc(sizeof(*temp->domain_data));
if (!temp->domain_data)
return -ENOMEM;
memcpy(temp->domain_data, &event->schedstat_domain, sizeof(*temp->domain_data));
if (!after_workload_flag) {
cpu_tail = list_last_entry(&cpu_head, struct schedstat_cpu, cpu_list);
list_add_tail(&temp->domain_list, &cpu_tail->domain_head);
} else {
store_schedstat_domain_diff(temp);
domain_second_pass = list_next_entry(domain_second_pass, domain_list);
}
}
return 0;
}
static void free_schedstat(struct list_head *head)
{
struct schedstat_domain *dptr, *n1;
struct schedstat_cpu *cptr, *n2;
list_for_each_entry_safe(cptr, n2, head, cpu_list) {
list_for_each_entry_safe(dptr, n1, &cptr->domain_head, domain_list) {
list_del_init(&dptr->domain_list);
free(dptr);
}
list_del_init(&cptr->cpu_list);
free(cptr);
}
}
static int perf_sched__schedstat_report(struct perf_sched *sched)
{
struct cpu_domain_map **cd_map;
struct perf_session *session;
struct target target = {};
struct perf_data data = {
.path = input_name,
.mode = PERF_DATA_MODE_READ,
};
int err = 0;
sched->tool.schedstat_cpu = perf_sched__process_schedstat;
sched->tool.schedstat_domain = perf_sched__process_schedstat;
session = perf_session__new(&data, &sched->tool);
if (IS_ERR(session)) {
pr_err("Perf session creation failed.\n");
return PTR_ERR(session);
}
if (cpu_list)
target.cpu_list = cpu_list;
else
target.system_wide = true;
err = evlist__create_maps(session->evlist, &target);
if (err < 0)
goto out;
user_requested_cpus = session->evlist->core.user_requested_cpus;
err = perf_session__process_events(session);
if (!err) {
setup_pager();
if (list_empty(&cpu_head)) {
pr_err("Data is not available\n");
err = -1;
goto out;
}
cd_map = session->header.env.cpu_domain;
err = show_schedstat_data(&cpu_head, cd_map, NULL, NULL, false);
}
out:
free_schedstat(&cpu_head);
perf_session__delete(session);
return err;
}
static int perf_sched__schedstat_diff(struct perf_sched *sched,
int argc, const char **argv)
{
struct cpu_domain_map **cd_map0 = NULL, **cd_map1 = NULL;
struct list_head cpu_head_ses0, cpu_head_ses1;
struct perf_session *session[2];
struct perf_data data[2];
int ret = 0, err = 0;
static const char *defaults[] = {
"perf.data.old",
"perf.data",
};
if (argc) {
if (argc == 1)
defaults[1] = argv[0];
else if (argc == 2) {
defaults[0] = argv[0];
defaults[1] = argv[1];
} else {
pr_err("perf sched stats diff is not supported with more than 2 files.\n");
goto out_ret;
}
}
INIT_LIST_HEAD(&cpu_head_ses0);
INIT_LIST_HEAD(&cpu_head_ses1);
sched->tool.schedstat_cpu = perf_sched__process_schedstat;
sched->tool.schedstat_domain = perf_sched__process_schedstat;
data[0].path = defaults[0];
data[0].mode = PERF_DATA_MODE_READ;
session[0] = perf_session__new(&data[0], &sched->tool);
if (IS_ERR(session[0])) {
ret = PTR_ERR(session[0]);
pr_err("Failed to open %s\n", data[0].path);
goto out_delete_ses0;
}
err = perf_session__process_events(session[0]);
if (err)
goto out_delete_ses0;
cd_map0 = session[0]->header.env.cpu_domain;
list_replace_init(&cpu_head, &cpu_head_ses0);
after_workload_flag = false;
data[1].path = defaults[1];
data[1].mode = PERF_DATA_MODE_READ;
session[1] = perf_session__new(&data[1], &sched->tool);
if (IS_ERR(session[1])) {
ret = PTR_ERR(session[1]);
pr_err("Failed to open %s\n", data[1].path);
goto out_delete_ses1;
}
err = perf_session__process_events(session[1]);
if (err)
goto out_delete_ses1;
cd_map1 = session[1]->header.env.cpu_domain;
list_replace_init(&cpu_head, &cpu_head_ses1);
after_workload_flag = false;
setup_pager();
if (list_empty(&cpu_head_ses1)) {
pr_err("Data is not available\n");
ret = -1;
goto out_delete_ses1;
}
if (list_empty(&cpu_head_ses0)) {
pr_err("Data is not available\n");
ret = -1;
goto out_delete_ses0;
}
show_schedstat_data(&cpu_head_ses0, cd_map0, &cpu_head_ses1, cd_map1, true);
out_delete_ses1:
free_schedstat(&cpu_head_ses1);
if (!IS_ERR(session[1]))
perf_session__delete(session[1]);
out_delete_ses0:
free_schedstat(&cpu_head_ses0);
if (!IS_ERR(session[0]))
perf_session__delete(session[0]);
out_ret:
return ret;
}
static int process_synthesized_event_live(const struct perf_tool *tool __maybe_unused,
union perf_event *event,
struct perf_sample *sample __maybe_unused,
struct machine *machine __maybe_unused)
{
return perf_sched__process_schedstat(tool, NULL, event);
}
static int perf_sched__schedstat_live(struct perf_sched *sched,
int argc, const char **argv)
{
struct cpu_domain_map **cd_map = NULL;
struct target target = {};
u32 __maybe_unused md;
struct evlist *evlist;
u32 nr = 0, sv;
int reset = 0;
int err = 0;
signal(SIGINT, sighandler);
signal(SIGCHLD, sighandler);
signal(SIGTERM, sighandler);
evlist = evlist__new();
if (!evlist)
return -ENOMEM;
if (cpu_list)
target.cpu_list = cpu_list;
else
target.system_wide = true;
if (argc) {
err = evlist__prepare_workload(evlist, &target, argv, false, NULL);
if (err)
goto out;
}
err = evlist__create_maps(evlist, &target);
if (err < 0)
goto out;
user_requested_cpus = evlist->core.user_requested_cpus;
err = perf_event__synthesize_schedstat(&(sched->tool),
process_synthesized_event_live,
user_requested_cpus);
if (err < 0)
goto out;
err = enable_sched_schedstats(&reset);
if (err < 0)
goto out;
if (argc)
evlist__start_workload(evlist);
pause();
if (reset) {
err = disable_sched_schedstat();
if (err < 0)
goto out;
}
err = perf_event__synthesize_schedstat(&(sched->tool),
process_synthesized_event_live,
user_requested_cpus);
if (err)
goto out;
setup_pager();
if (list_empty(&cpu_head)) {
pr_err("Data is not available\n");
err = -1;
goto out;
}
nr = cpu__max_present_cpu().cpu;
cd_map = build_cpu_domain_map(&sv, &md, nr);
if (!cd_map) {
pr_err("Unable to generate cpu-domain relation info");
goto out;
}
show_schedstat_data(&cpu_head, cd_map, NULL, NULL, false);
free_cpu_domain_info(cd_map, sv, nr);
out:
free_schedstat(&cpu_head);
evlist__delete(evlist);
return err;
}
static bool schedstat_events_exposed(void)
{
return IS_ERR(trace_event__tp_format("sched", "sched_stat_wait")) ?
false : true;
}
static int __cmd_record(int argc, const char **argv)
{
unsigned int rec_argc, i, j;
char **rec_argv;
const char **rec_argv_copy;
const char * const record_args[] = {
"record",
"-a",
"-R",
"-m", "1024",
"-c", "1",
"-e", "sched:sched_switch",
"-e", "sched:sched_stat_runtime",
"-e", "sched:sched_process_fork",
"-e", "sched:sched_wakeup_new",
"-e", "sched:sched_migrate_task",
};
const char * const schedstat_args[] = {
"-e", "sched:sched_stat_wait",
"-e", "sched:sched_stat_sleep",
"-e", "sched:sched_stat_iowait",
};
unsigned int schedstat_argc = schedstat_events_exposed() ?
ARRAY_SIZE(schedstat_args) : 0;
struct tep_event *waking_event;
int ret;
rec_argc = ARRAY_SIZE(record_args) + 2 + schedstat_argc + argc - 1;
rec_argv = calloc(rec_argc + 1, sizeof(char *));
if (rec_argv == NULL)
return -ENOMEM;
rec_argv_copy = calloc(rec_argc + 1, sizeof(char *));
if (rec_argv_copy == NULL) {
free(rec_argv);
return -ENOMEM;
}
for (i = 0; i < ARRAY_SIZE(record_args); i++)
rec_argv[i] = strdup(record_args[i]);
rec_argv[i++] = strdup("-e");
waking_event = trace_event__tp_format("sched", "sched_waking");
if (!IS_ERR(waking_event))
rec_argv[i++] = strdup("sched:sched_waking");
else
rec_argv[i++] = strdup("sched:sched_wakeup");
for (j = 0; j < schedstat_argc; j++)
rec_argv[i++] = strdup(schedstat_args[j]);
for (j = 1; j < (unsigned int)argc; j++, i++)
rec_argv[i] = strdup(argv[j]);
BUG_ON(i != rec_argc);
memcpy(rec_argv_copy, rec_argv, sizeof(char *) * rec_argc);
ret = cmd_record(rec_argc, rec_argv_copy);
for (i = 0; i < rec_argc; i++)
free(rec_argv[i]);
free(rec_argv);
free(rec_argv_copy);
return ret;
}
int cmd_sched(int argc, const char **argv)
{
static const char default_sort_order[] = "avg, max, switch, runtime";
struct perf_sched sched = {
.cmp_pid = LIST_HEAD_INIT(sched.cmp_pid),
.sort_list = LIST_HEAD_INIT(sched.sort_list),
.sort_order = default_sort_order,
.replay_repeat = 10,
.profile_cpu = -1,
.next_shortname1 = 'A',
.next_shortname2 = '0',
.skip_merge = 0,
.show_callchain = 1,
.max_stack = 5,
};
const struct option sched_options[] = {
OPT_STRING('i', "input", &input_name, "file",
"input file name"),
OPT_INCR('v', "verbose", &verbose,
"be more verbose (show symbol address, etc)"),
OPT_BOOLEAN('D', "dump-raw-trace", &dump_trace,
"dump raw trace in ASCII"),
OPT_BOOLEAN('f', "force", &sched.force, "don't complain, do it"),
OPT_END()
};
const struct option latency_options[] = {
OPT_STRING('s', "sort", &sched.sort_order, "key[,key2...]",
"sort by key(s): runtime, switch, avg, max"),
OPT_INTEGER('C', "CPU", &sched.profile_cpu,
"CPU to profile on"),
OPT_BOOLEAN('p', "pids", &sched.skip_merge,
"latency stats per pid instead of per comm"),
OPT_PARENT(sched_options)
};
const struct option replay_options[] = {
OPT_UINTEGER('r', "repeat", &sched.replay_repeat,
"repeat the workload replay N times (0: infinite)"),
OPT_PARENT(sched_options)
};
const struct option map_options[] = {
OPT_BOOLEAN(0, "compact", &sched.map.comp,
"map output in compact mode"),
OPT_STRING(0, "color-pids", &sched.map.color_pids_str, "pids",
"highlight given pids in map"),
OPT_STRING(0, "color-cpus", &sched.map.color_cpus_str, "cpus",
"highlight given CPUs in map"),
OPT_STRING(0, "cpus", &sched.map.cpus_str, "cpus",
"display given CPUs in map"),
OPT_STRING(0, "task-name", &sched.map.task_name, "task",
"map output only for the given task name(s)."),
OPT_BOOLEAN(0, "fuzzy-name", &sched.map.fuzzy,
"given command name can be partially matched (fuzzy matching)"),
OPT_PARENT(sched_options)
};
const struct option timehist_options[] = {
OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
"file", "vmlinux pathname"),
OPT_STRING(0, "kallsyms", &symbol_conf.kallsyms_name,
"file", "kallsyms pathname"),
OPT_BOOLEAN('g', "call-graph", &sched.show_callchain,
"Display call chains if present (default on)"),
OPT_UINTEGER(0, "max-stack", &sched.max_stack,
"Maximum number of functions to display backtrace."),
OPT_STRING(0, "symfs", &symbol_conf.symfs, "directory",
"Look for files with symbols relative to this directory"),
OPT_BOOLEAN('s', "summary", &sched.summary_only,
"Show only syscall summary with statistics"),
OPT_BOOLEAN('S', "with-summary", &sched.summary,
"Show all syscalls and summary with statistics"),
OPT_BOOLEAN('w', "wakeups", &sched.show_wakeups, "Show wakeup events"),
OPT_BOOLEAN('n', "next", &sched.show_next, "Show next task"),
OPT_BOOLEAN('M', "migrations", &sched.show_migrations, "Show migration events"),
OPT_BOOLEAN('V', "cpu-visual", &sched.show_cpu_visual, "Add CPU visual"),
OPT_BOOLEAN('I', "idle-hist", &sched.idle_hist, "Show idle events only"),
OPT_STRING(0, "time", &sched.time_str, "str",
"Time span for analysis (start,stop)"),
OPT_BOOLEAN(0, "state", &sched.show_state, "Show task state when sched-out"),
OPT_STRING('p', "pid", &symbol_conf.pid_list_str, "pid[,pid...]",
"analyze events only for given process id(s)"),
OPT_STRING('t', "tid", &symbol_conf.tid_list_str, "tid[,tid...]",
"analyze events only for given thread id(s)"),
OPT_STRING('C', "cpu", &cpu_list, "cpu", "list of cpus to profile"),
OPT_BOOLEAN(0, "show-prio", &sched.show_prio, "Show task priority"),
OPT_STRING(0, "prio", &sched.prio_str, "prio",
"analyze events only for given task priority(ies)"),
OPT_BOOLEAN('P', "pre-migrations", &sched.pre_migrations, "Show pre-migration wait time"),
OPT_PARENT(sched_options)
};
const struct option stats_options[] = {
OPT_STRING('i', "input", &input_name, "file",
"`stats report` with input filename"),
OPT_STRING('o', "output", &output_name, "file",
"`stats record` with output filename"),
OPT_STRING('C', "cpu", &cpu_list, "cpu", "list of cpus to profile"),
OPT_BOOLEAN('v', "verbose", &verbose_field, "Show explanation for fields in the report"),
OPT_END()
};
const char * const latency_usage[] = {
"perf sched latency [<options>]",
NULL
};
const char * const replay_usage[] = {
"perf sched replay [<options>]",
NULL
};
const char * const map_usage[] = {
"perf sched map [<options>]",
NULL
};
const char * const timehist_usage[] = {
"perf sched timehist [<options>]",
NULL
};
const char *stats_usage[] = {
"perf sched stats {record|report} [<options>]",
NULL
};
const char *const sched_subcommands[] = { "record", "latency", "map",
"replay", "script",
"timehist", "stats", NULL };
const char *sched_usage[] = {
NULL,
NULL
};
struct trace_sched_handler lat_ops = {
.wakeup_event = latency_wakeup_event,
.switch_event = latency_switch_event,
.runtime_event = latency_runtime_event,
.migrate_task_event = latency_migrate_task_event,
};
struct trace_sched_handler map_ops = {
.switch_event = map_switch_event,
};
struct trace_sched_handler replay_ops = {
.wakeup_event = replay_wakeup_event,
.switch_event = replay_switch_event,
.fork_event = replay_fork_event,
};
int ret;
perf_tool__init(&sched.tool, true);
sched.tool.sample = perf_sched__process_tracepoint_sample;
sched.tool.comm = perf_sched__process_comm;
sched.tool.namespaces = perf_event__process_namespaces;
sched.tool.lost = perf_event__process_lost;
sched.tool.fork = perf_sched__process_fork_event;
argc = parse_options_subcommand(argc, argv, sched_options, sched_subcommands,
sched_usage, PARSE_OPT_STOP_AT_NON_OPTION);
if (!argc)
usage_with_options(sched_usage, sched_options);
thread__set_priv_destructor(free);
if (!strcmp(argv[0], "script")) {
ret = cmd_script(argc, argv);
} else if (strlen(argv[0]) > 2 && strstarts("record", argv[0])) {
ret = __cmd_record(argc, argv);
} else if (strlen(argv[0]) > 2 && strstarts("latency", argv[0])) {
sched.tp_handler = &lat_ops;
if (argc > 1) {
argc = parse_options(argc, argv, latency_options, latency_usage, 0);
if (argc)
usage_with_options(latency_usage, latency_options);
}
setup_sorting(&sched, latency_options, latency_usage);
ret = perf_sched__lat(&sched);
} else if (!strcmp(argv[0], "map")) {
if (argc) {
argc = parse_options(argc, argv, map_options, map_usage, 0);
if (argc)
usage_with_options(map_usage, map_options);
if (sched.map.task_name) {
sched.map.task_names = strlist__new(sched.map.task_name, NULL);
if (sched.map.task_names == NULL) {
fprintf(stderr, "Failed to parse task names\n");
ret = -1;
goto out;
}
}
}
sched.tp_handler = &map_ops;
setup_sorting(&sched, latency_options, latency_usage);
ret = perf_sched__map(&sched);
} else if (strlen(argv[0]) > 2 && strstarts("replay", argv[0])) {
sched.tp_handler = &replay_ops;
if (argc) {
argc = parse_options(argc, argv, replay_options, replay_usage, 0);
if (argc)
usage_with_options(replay_usage, replay_options);
}
ret = perf_sched__replay(&sched);
} else if (!strcmp(argv[0], "timehist")) {
if (argc) {
argc = parse_options(argc, argv, timehist_options,
timehist_usage, 0);
if (argc)
usage_with_options(timehist_usage, timehist_options);
}
if ((sched.show_wakeups || sched.show_next) &&
sched.summary_only) {
pr_err(" Error: -s and -[n|w] are mutually exclusive.\n");
parse_options_usage(timehist_usage, timehist_options, "s", true);
if (sched.show_wakeups)
parse_options_usage(NULL, timehist_options, "w", true);
if (sched.show_next)
parse_options_usage(NULL, timehist_options, "n", true);
ret = -EINVAL;
goto out;
}
ret = symbol__validate_sym_arguments();
if (!ret)
ret = perf_sched__timehist(&sched);
} else if (!strcmp(argv[0], "stats")) {
const char *const stats_subcommands[] = {"record", "report", NULL};
argc = parse_options_subcommand(argc, argv, stats_options,
stats_subcommands,
stats_usage,
PARSE_OPT_STOP_AT_NON_OPTION);
if (argv[0] && !strcmp(argv[0], "record")) {
if (argc)
argc = parse_options(argc, argv, stats_options,
stats_usage, 0);
return perf_sched__schedstat_record(&sched, argc, argv);
} else if (argv[0] && !strcmp(argv[0], "report")) {
if (argc)
argc = parse_options(argc, argv, stats_options,
stats_usage, 0);
return perf_sched__schedstat_report(&sched);
} else if (argv[0] && !strcmp(argv[0], "diff")) {
if (argc)
argc = parse_options(argc, argv, stats_options,
stats_usage, 0);
return perf_sched__schedstat_diff(&sched, argc, argv);
}
return perf_sched__schedstat_live(&sched, argc, argv);
} else {
usage_with_options(sched_usage, sched_options);
}
out:
free((void *)sched_usage[0]);
return ret;
}
