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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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3
test/unit/mallctl.c
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@ -530,6 +530,9 @@ TEST_BEGIN(test_mallctl_opt) {
TEST_MALLCTL_OPT(size_t, hpa_sec_nshards, always);
TEST_MALLCTL_OPT(size_t, hpa_sec_max_alloc, always);
TEST_MALLCTL_OPT(size_t, hpa_sec_max_bytes, always);
TEST_MALLCTL_OPT(size_t, experimental_pac_sec_nshards, always);
TEST_MALLCTL_OPT(size_t, experimental_pac_sec_max_alloc, always);
TEST_MALLCTL_OPT(size_t, experimental_pac_sec_max_bytes, always);
TEST_MALLCTL_OPT(ssize_t, experimental_hpa_max_purge_nhp, always);
TEST_MALLCTL_OPT(size_t, hpa_purge_threshold, always);
TEST_MALLCTL_OPT(uint64_t, hpa_min_purge_delay_ms, always);