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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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src/pa.c
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@ -94,6 +94,7 @@ pa_shard_reset(tsdn_t *tsdn, pa_shard_t *shard) {
void
pa_shard_flush(tsdn_t *tsdn, pa_shard_t *shard) {
pac_sec_flush(tsdn, &shard->pac);
if (shard->ever_used_hpa) {
hpa_shard_flush(tsdn, &shard->hpa);
}