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Optimize malloc_large_stats_t maintenance.

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Convert the nrequests field to be partially derived, and the curlextents
to be fully derived, in order to reduce the number of stats updates
needed during common operations.

This change affects ndalloc stats during arena reset, because it is no
longer possible to cancel out ndalloc effects (curlextents would become
negative).
This commit is contained in:
Jason Evans 2017-03-03 20:44:39 -08:00
parent d4ac7582f3
commit 04d8fcb745
2 changed files with 8 additions and 31 deletions
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4
include/jemalloc/internal/stats_structs.h
View File

@ -64,10 +64,10 @@ struct malloc_large_stats_s {
* This includes requests served by tcache, though tcache only
* periodically merges into this counter.
*/
uint64_t nrequests;
uint64_t nrequests; /* Partially derived. */
/* Current number of allocations of this size class. */
size_t curlextents;
size_t curlextents; /* Derived. */
};
/*

35
src/arena.c
View File

@ -89,7 +89,7 @@ arena_stats_add_u64(tsdn_t *tsdn, arena_stats_t *arena_stats, uint64_t *p,
#endif
}
static void
UNUSED static void
arena_stats_sub_u64(tsdn_t *tsdn, arena_stats_t *arena_stats, uint64_t *p,
uint64_t x) {
#ifdef JEMALLOC_ATOMIC_U64
@ -206,11 +206,12 @@ arena_stats_merge(tsdn_t *tsdn, arena_t *arena, unsigned *nthreads,
uint64_t nrequests = arena_stats_read_u64(tsdn, &arena->stats,
&arena->stats.lstats[i].nrequests);
lstats[i].nrequests += nrequests;
astats->nrequests_large += nrequests;
lstats[i].nrequests += nmalloc + nrequests;
astats->nrequests_large += nmalloc + nrequests;
size_t curlextents = arena_stats_read_zu(tsdn,
&arena->stats, &arena->stats.lstats[i].curlextents);
assert(nmalloc >= ndalloc);
assert(nmalloc - ndalloc <= SIZE_T_MAX);
size_t curlextents = (size_t)(nmalloc - ndalloc);
lstats[i].curlextents += curlextents;
astats->allocated_large += curlextents * index2size(NBINS + i);
}
@ -359,10 +360,6 @@ arena_large_malloc_stats_update(tsdn_t *tsdn, arena_t *arena, size_t usize) {
arena_stats_add_u64(tsdn, &arena->stats,
&arena->stats.lstats[hindex].nmalloc, 1);
arena_stats_add_u64(tsdn, &arena->stats,
&arena->stats.lstats[hindex].nrequests, 1);
arena_stats_add_zu(tsdn, &arena->stats,
&arena->stats.lstats[hindex].curlextents, 1);
}
static void
@ -379,21 +376,6 @@ arena_large_dalloc_stats_update(tsdn_t *tsdn, arena_t *arena, size_t usize) {
arena_stats_add_u64(tsdn, &arena->stats,
&arena->stats.lstats[hindex].ndalloc, 1);
arena_stats_sub_zu(tsdn, &arena->stats,
&arena->stats.lstats[hindex].curlextents, 1);
}
static void
arena_large_reset_stats_cancel(tsdn_t *tsdn, arena_t *arena, size_t usize) {
szind_t index = size2index(usize);
szind_t hindex = (index >= NBINS) ? index - NBINS : 0;
cassert(config_stats);
arena_stats_lock(tsdn, &arena->stats);
arena_stats_sub_u64(tsdn, &arena->stats,
&arena->stats.lstats[hindex].ndalloc, 1);
arena_stats_unlock(tsdn, &arena->stats);
}
static void
@ -912,11 +894,6 @@ arena_reset(tsd_t *tsd, arena_t *arena) {
}
large_dalloc(tsd_tsdn(tsd), extent);
malloc_mutex_lock(tsd_tsdn(tsd), &arena->large_mtx);
/* Cancel out unwanted effects on stats. */
if (config_stats) {
arena_large_reset_stats_cancel(tsd_tsdn(tsd), arena,
usize);
}
}
malloc_mutex_unlock(tsd_tsdn(tsd), &arena->large_mtx);