PERF_EVLIST__HLIST_SIZE
for (i = 0; i < PERF_EVLIST__HLIST_SIZE; ++i)
struct hlist_head heads[PERF_EVLIST__HLIST_SIZE];
struct hlist_head tids[PERF_EVLIST__HLIST_SIZE];
free_hlist(gs->heads, PERF_EVLIST__HLIST_SIZE);
free_hlist(gs->tids, PERF_EVLIST__HLIST_SIZE);
struct hlist_head heads[PERF_EVLIST__HLIST_SIZE];