romenskiy2012/jemalloc
1
0
Fork 0
mirror of https://github.com/jemalloc/jemalloc.git synced 2026-05-30 08:37:29 +03:00
Code Issues Projects Releases Packages Wiki Activity

Add a mallctl for users to get an approximate of active bytes.

Browse source
This commit is contained in:
Guangli Dai 2025-11-25 16:26:49 -08:00 • committed by Guangli Dai
parent 8a06b086f3
commit 0988583d7c
2 changed files with 150 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

45
src/ctl.c
View file

@ -353,6 +353,7 @@ CTL_PROTO(stats_resident)
CTL_PROTO(stats_mapped)
CTL_PROTO(stats_retained)
CTL_PROTO(stats_zero_reallocs)
CTL_PROTO(approximate_stats_active)
CTL_PROTO(experimental_hooks_install)
CTL_PROTO(experimental_hooks_remove)
CTL_PROTO(experimental_hooks_prof_backtrace)
@ -853,6 +854,10 @@ static const ctl_named_node_t stats_mutexes_node[] = {
{NAME("reset"), CTL(stats_mutexes_reset)}};
#undef MUTEX_PROF_DATA_NODE
static const ctl_named_node_t approximate_stats_node[] = {
{NAME("active"), CTL(approximate_stats_active)},
};
static const ctl_named_node_t stats_node[] = {
{NAME("allocated"), CTL(stats_allocated)},
{NAME("active"), CTL(stats_active)},
@ -920,6 +925,7 @@ static const ctl_named_node_t root_node[] = {{NAME("version"), CTL(version)},
{NAME("arena"), CHILD(indexed, arena)},
{NAME("arenas"), CHILD(named, arenas)}, {NAME("prof"), CHILD(named, prof)},
{NAME("stats"), CHILD(named, stats)},
{NAME("approximate_stats"), CHILD(named, approximate_stats)},
{NAME("experimental"), CHILD(named, experimental)}};
static const ctl_named_node_t super_root_node[] = {
{NAME(""), CHILD(named, root)}};
@ -3756,6 +3762,45 @@ CTL_RO_CGEN(config_stats, stats_background_thread_run_interval,
CTL_RO_CGEN(config_stats, stats_zero_reallocs,
atomic_load_zu(&zero_realloc_count, ATOMIC_RELAXED), size_t)
/*
* approximate_stats.active returns a result that is informative itself,
* but the returned value SHOULD NOT be compared against other stats retrieved.
* For instance, approximate_stats.active should not be compared against
* any stats, e.g., stats.active or stats.resident, because there is no
* guarantee in the comparison results. Results returned by stats.*, on the
* other hand, provides such guarantees, i.e., stats.active <= stats.resident,
* as long as epoch is called right before the queries.
*/
static int
approximate_stats_active_ctl(tsd_t *tsd, const size_t *mib, size_t miblen,
void *oldp, size_t *oldlenp, void *newp, size_t newlen) {
int ret;
size_t approximate_nactive = 0;
size_t approximate_active_bytes = 0;
READONLY();
tsdn_t *tsdn = tsd_tsdn(tsd);
unsigned n = narenas_total_get();
for (unsigned i = 0; i < n; i++) {
arena_t *arena = arena_get(tsdn, i, false);
if (!arena) {
continue;
}
/* Accumulate nactive pages from each arena's pa_shard */
approximate_nactive += pa_shard_nactive(&arena->pa_shard);
}
approximate_active_bytes = approximate_nactive << LG_PAGE;
READ(approximate_active_bytes, size_t);
ret = 0;
label_return:
return ret;
}
CTL_RO_GEN(stats_arenas_i_dss, arenas_i(mib[2])->dss, const char *)
CTL_RO_GEN(
stats_arenas_i_dirty_decay_ms, arenas_i(mib[2])->dirty_decay_ms, ssize_t)