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Use SEC in PAC to reduce lock contention on the ecaches

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Add a small extent cache in front of the PAC ecaches. Allocs and dallocs
that fit are served from per-shard SEC bins without taking the ecache
mutex; overflow falls through to the backing ecaches, including
ecache_pinned for pinned extents.

The feature is gated behind experimental_pac_sec_nshards (default 0,
disabled). To support independent HPA and PAC SEC instances,
sec_alloc/sec_dalloc/sec_fill take an explicit shard argument, with HPA
and PAC using separate TSD shard slots.
This commit is contained in:
Bin Liu 2026-05-19 00:11:15 -07:00 • committed by Guangli Dai
parent 2043c6ab58
commit 9c1a484e1d
19 changed files with 986 additions and 102 deletions
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src/jemalloc.c
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@ -198,6 +198,9 @@ size_t opt_calloc_madvise_threshold = CALLOC_MADVISE_THRESHOLD_DEFAULT;
bool opt_hpa = false;
hpa_shard_opts_t opt_hpa_opts = HPA_SHARD_OPTS_DEFAULT;
sec_opts_t opt_hpa_sec_opts = SEC_OPTS_DEFAULT;
sec_opts_t opt_pac_sec_opts = {0,
(32 * 1024) > (PAGE * 2) ? (32 * 1024) : (PAGE * 2),
SEC_OPTS_MAX_BYTES_DEFAULT};
/* False should be the common case. Set to true to trigger initialization. */
bool malloc_slow = true;