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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
parent 8aa7e5ec03
commit ccf9cdf417
19 changed files with 986 additions and 102 deletions
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2
test/unit/json_stats.c
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@ -181,7 +181,7 @@ static const size_t num_global_mutexes = sizeof(global_mutex_names)
static const char *arena_mutex_names[] = {"large", "extent_avail",
"extents_dirty", "extents_muzzy", "extents_retained", "decay_dirty",
"decay_muzzy", "base", "tcache_list", "hpa_shard", "hpa_shard_grow",
"hpa_sec"};
"hpa_sec", "pac_sec"};
static const size_t num_arena_mutexes = sizeof(arena_mutex_names)
/ sizeof(arena_mutex_names[0]);