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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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11
src/conf.c
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@ -950,6 +950,17 @@ malloc_conf_init_helper(sc_data_t *sc_data, unsigned bin_shard_sizes[SC_NBINS],
CONF_HANDLE_SIZE_T(opt_hpa_sec_opts.max_bytes,
"hpa_sec_max_bytes", SEC_OPTS_MAX_BYTES_DEFAULT, 0,
CONF_CHECK_MIN, CONF_DONT_CHECK_MAX, true);
CONF_HANDLE_SIZE_T(opt_pac_sec_opts.nshards,
"experimental_pac_sec_nshards", 0, 0,
CONF_CHECK_MIN, CONF_DONT_CHECK_MAX, true);
CONF_HANDLE_SIZE_T(opt_pac_sec_opts.max_alloc,
"experimental_pac_sec_max_alloc", PAGE,
USIZE_GROW_SLOW_THRESHOLD, CONF_CHECK_MIN,
CONF_CHECK_MAX, true);
CONF_HANDLE_SIZE_T(opt_pac_sec_opts.max_bytes,
"experimental_pac_sec_max_bytes",
SEC_OPTS_MAX_BYTES_DEFAULT, 0,
CONF_CHECK_MIN, CONF_DONT_CHECK_MAX, true);
if (CONF_MATCH("slab_sizes")) {
if (CONF_MATCH_VALUE("default")) {