#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/trace_events.h>
#include <linux/memcontrol.h>
#include <trace/events/mmflags.h>
#include <linux/migrate.h>
#include <linux/page_owner.h>
#include <linux/ctype.h>
#include "internal.h"
#include <trace/events/migrate.h>
#undef EM
#undef EMe
#define EM(a, b) b,
#define EMe(a, b) b
const char *migrate_reason_names[MR_TYPES] = {
MIGRATE_REASON
};
const struct trace_print_flags pageflag_names[] = {
__def_pageflag_names,
{0, NULL}
};
const struct trace_print_flags gfpflag_names[] = {
__def_gfpflag_names,
{0, NULL}
};
const struct trace_print_flags vmaflag_names[] = {
__def_vmaflag_names,
{0, NULL}
};
#define DEF_PAGETYPE_NAME(_name) [PGTY_##_name - 0xf0] = __stringify(_name)
static const char *page_type_names[] = {
DEF_PAGETYPE_NAME(slab),
DEF_PAGETYPE_NAME(hugetlb),
DEF_PAGETYPE_NAME(offline),
DEF_PAGETYPE_NAME(guard),
DEF_PAGETYPE_NAME(table),
DEF_PAGETYPE_NAME(buddy),
DEF_PAGETYPE_NAME(unaccepted),
};
static const char *page_type_name(unsigned int page_type)
{
unsigned i = (page_type >> 24) - 0xf0;
if (i >= ARRAY_SIZE(page_type_names))
return "unknown";
return page_type_names[i];
}
static void __dump_folio(const struct folio *folio, const struct page *page,
unsigned long pfn, unsigned long idx)
{
struct address_space *mapping = folio_mapping(folio);
int mapcount = atomic_read(&page->_mapcount) + 1;
char *type = "";
if (page_mapcount_is_type(mapcount))
mapcount = 0;
pr_warn("page: refcount:%d mapcount:%d mapping:%p index:%#lx pfn:%#lx\n",
folio_ref_count(folio), mapcount, mapping,
folio->index + idx, pfn);
if (folio_test_large(folio)) {
int pincount = 0;
if (folio_has_pincount(folio))
pincount = atomic_read(&folio->_pincount);
pr_warn("head: order:%u mapcount:%d entire_mapcount:%d nr_pages_mapped:%d pincount:%d\n",
folio_order(folio),
folio_mapcount(folio),
folio_entire_mapcount(folio),
folio_nr_pages_mapped(folio),
pincount);
}
#ifdef CONFIG_MEMCG
if (folio->memcg_data)
pr_warn("memcg:%lx\n", folio->memcg_data);
#endif
if (folio_test_ksm(folio))
type = "ksm ";
else if (folio_test_anon(folio))
type = "anon ";
else if (mapping)
dump_mapping(mapping);
BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
pr_warn("%sflags: %pGp%s\n", type, &folio->flags,
is_migrate_cma_folio(folio, pfn) ? " CMA" : "");
if (page_has_type(&folio->page))
pr_warn("page_type: %x(%s)\n", folio->page.page_type >> 24,
page_type_name(folio->page.page_type));
print_hex_dump(KERN_WARNING, "raw: ", DUMP_PREFIX_NONE, 32,
sizeof(unsigned long), page,
sizeof(struct page), false);
if (folio_test_large(folio))
print_hex_dump(KERN_WARNING, "head: ", DUMP_PREFIX_NONE, 32,
sizeof(unsigned long), folio,
2 * sizeof(struct page), false);
}
static void __dump_page(const struct page *page)
{
struct page_snapshot ps;
snapshot_page(&ps, page);
if (!snapshot_page_is_faithful(&ps))
pr_warn("page does not match folio\n");
__dump_folio(&ps.folio_snapshot, &ps.page_snapshot, ps.pfn, ps.idx);
}
void dump_page(const struct page *page, const char *reason)
{
if (PagePoisoned(page))
pr_warn("page:%p is uninitialized and poisoned\n", page);
else
__dump_page(page);
if (reason)
pr_warn("page dumped because: %s\n", reason);
dump_page_owner(page);
}
EXPORT_SYMBOL(dump_page);
#ifdef CONFIG_DEBUG_VM
void dump_vma(const struct vm_area_struct *vma)
{
pr_emerg("vma %px start %px end %px mm %px\n"
"prot %lx anon_vma %px vm_ops %px\n"
"pgoff %lx file %px private_data %px\n"
#ifdef CONFIG_PER_VMA_LOCK
"refcnt %x\n"
#endif
"flags: %#lx(%pGv)\n",
vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_mm,
(unsigned long)pgprot_val(vma->vm_page_prot),
vma->anon_vma, vma->vm_ops, vma->vm_pgoff,
vma->vm_file, vma->vm_private_data,
#ifdef CONFIG_PER_VMA_LOCK
refcount_read(&vma->vm_refcnt),
#endif
vma->vm_flags, &vma->vm_flags);
}
EXPORT_SYMBOL(dump_vma);
void dump_mm(const struct mm_struct *mm)
{
pr_emerg("mm %px task_size %lu\n"
"mmap_base %lu mmap_legacy_base %lu\n"
"pgd %px mm_users %d mm_count %d pgtables_bytes %lu map_count %d\n"
"hiwater_rss %lx hiwater_vm %lx total_vm %lx locked_vm %lx\n"
"pinned_vm %llx data_vm %lx exec_vm %lx stack_vm %lx\n"
"start_code %lx end_code %lx start_data %lx end_data %lx\n"
"start_brk %lx brk %lx start_stack %lx\n"
"arg_start %lx arg_end %lx env_start %lx env_end %lx\n"
"binfmt %px flags %*pb\n"
#ifdef CONFIG_AIO
"ioctx_table %px\n"
#endif
#ifdef CONFIG_MEMCG
"owner %px "
#endif
"exe_file %px\n"
#ifdef CONFIG_MMU_NOTIFIER
"notifier_subscriptions %px\n"
#endif
#ifdef CONFIG_NUMA_BALANCING
"numa_next_scan %lu numa_scan_offset %lu numa_scan_seq %d\n"
#endif
"tlb_flush_pending %d\n"
"def_flags: %#lx(%pGv)\n",
mm, mm->task_size,
mm->mmap_base, mm->mmap_legacy_base,
mm->pgd, atomic_read(&mm->mm_users),
atomic_read(&mm->mm_count),
mm_pgtables_bytes(mm),
mm->map_count,
mm->hiwater_rss, mm->hiwater_vm, mm->total_vm, mm->locked_vm,
(u64)atomic64_read(&mm->pinned_vm),
mm->data_vm, mm->exec_vm, mm->stack_vm,
mm->start_code, mm->end_code, mm->start_data, mm->end_data,
mm->start_brk, mm->brk, mm->start_stack,
mm->arg_start, mm->arg_end, mm->env_start, mm->env_end,
mm->binfmt, NUM_MM_FLAG_BITS, __mm_flags_get_bitmap(mm),
#ifdef CONFIG_AIO
mm->ioctx_table,
#endif
#ifdef CONFIG_MEMCG
mm->owner,
#endif
mm->exe_file,
#ifdef CONFIG_MMU_NOTIFIER
mm->notifier_subscriptions,
#endif
#ifdef CONFIG_NUMA_BALANCING
mm->numa_next_scan, mm->numa_scan_offset, mm->numa_scan_seq,
#endif
atomic_read(&mm->tlb_flush_pending),
mm->def_flags, &mm->def_flags
);
}
EXPORT_SYMBOL(dump_mm);
void dump_vmg(const struct vma_merge_struct *vmg, const char *reason)
{
if (reason)
pr_warn("vmg %px dumped because: %s\n", vmg, reason);
if (!vmg) {
pr_warn("vmg %px state: (NULL)\n", vmg);
return;
}
pr_warn("vmg %px state: mm %px pgoff %lx\n"
"vmi %px [%lx,%lx)\n"
"prev %px middle %px next %px target %px\n"
"start %lx end %lx flags %lx\n"
"file %px anon_vma %px policy %px\n"
"uffd_ctx %px\n"
"anon_name %px\n"
"state %x\n"
"just_expand %d\n"
"__adjust_middle_start %d __adjust_next_start %d\n"
"__remove_middle %d __remove_next %d\n",
vmg, vmg->mm, vmg->pgoff,
vmg->vmi, vmg->vmi ? vma_iter_addr(vmg->vmi) : 0,
vmg->vmi ? vma_iter_end(vmg->vmi) : 0,
vmg->prev, vmg->middle, vmg->next, vmg->target,
vmg->start, vmg->end, vmg->vm_flags,
vmg->file, vmg->anon_vma, vmg->policy,
#ifdef CONFIG_USERFAULTFD
vmg->uffd_ctx.ctx,
#else
(void *)0,
#endif
vmg->anon_name,
(int)vmg->state,
vmg->just_expand,
vmg->__adjust_middle_start, vmg->__adjust_next_start,
vmg->__remove_middle, vmg->__remove_next);
if (vmg->mm) {
pr_warn("vmg %px mm:\n", vmg);
dump_mm(vmg->mm);
} else {
pr_warn("vmg %px mm: (NULL)\n", vmg);
}
if (vmg->prev) {
pr_warn("vmg %px prev:\n", vmg);
dump_vma(vmg->prev);
} else {
pr_warn("vmg %px prev: (NULL)\n", vmg);
}
if (vmg->middle) {
pr_warn("vmg %px middle:\n", vmg);
dump_vma(vmg->middle);
} else {
pr_warn("vmg %px middle: (NULL)\n", vmg);
}
if (vmg->next) {
pr_warn("vmg %px next:\n", vmg);
dump_vma(vmg->next);
} else {
pr_warn("vmg %px next: (NULL)\n", vmg);
}
#ifdef CONFIG_DEBUG_VM_MAPLE_TREE
if (vmg->vmi) {
pr_warn("vmg %px vmi:\n", vmg);
vma_iter_dump_tree(vmg->vmi);
} else {
pr_warn("vmg %px vmi: (NULL)\n", vmg);
}
#endif
}
EXPORT_SYMBOL(dump_vmg);
static bool page_init_poisoning __read_mostly = true;
static int __init setup_vm_debug(char *str)
{
bool __page_init_poisoning = true;
if (*str++ != '=' || !*str)
goto out;
__page_init_poisoning = false;
if (*str == '-')
goto out;
while (*str) {
switch (tolower(*str)) {
case 'p':
__page_init_poisoning = true;
break;
default:
pr_err("vm_debug option '%c' unknown. skipped\n",
*str);
}
str++;
}
out:
if (page_init_poisoning && !__page_init_poisoning)
pr_warn("Page struct poisoning disabled by kernel command line option 'vm_debug'\n");
page_init_poisoning = __page_init_poisoning;
return 1;
}
__setup("vm_debug", setup_vm_debug);
void page_init_poison(struct page *page, size_t size)
{
if (page_init_poisoning)
memset(page, PAGE_POISON_PATTERN, size);
}
void vma_iter_dump_tree(const struct vma_iterator *vmi)
{
#if defined(CONFIG_DEBUG_VM_MAPLE_TREE)
mas_dump(&vmi->mas);
mt_dump(vmi->mas.tree, mt_dump_hex);
#endif
}
#endif
