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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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Makefile.in
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@ -272,6 +272,7 @@ TESTS_UNIT := \
$(srcroot)test/unit/oversize_threshold.c \
$(srcroot)test/unit/pa.c \
$(srcroot)test/unit/pac.c \
$(srcroot)test/unit/pac_sec_integration.c \
$(srcroot)test/unit/pack.c \
$(srcroot)test/unit/pages.c \
$(srcroot)test/unit/peak.c \