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Introduce pinned extents to contain unpurgeable pages

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Some pages (e.g., hugetlb pages) cannot be purged, and should be
prioritized for reuse.  A custom extent_alloc hook signals this by
OR'ing EXTENT_ALLOC_FLAG_PINNED into the low bits of the returned
pointer; jemalloc strips the flag bits and caches pinned extents in
a dedicated ecache_pinned, separate from the dirty/muzzy decay
pipeline.

Pinned extents do not coalesce eagerly, except for ones larger than
SC_LARGE_MINCLASS.  A prefer-small policy reuses the smallest fitting
pinned extent, to avoid unnecessary split/fragmentation.
This commit is contained in:
Bin Liu 2026-04-19 22:56:22 -07:00 • committed by Guangli Dai
parent 7638093c73
commit be2de8ccd8
22 changed files with 977 additions and 86 deletions
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src/arena.c
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@ -797,6 +797,8 @@ arena_prepare_base_deletion(tsd_t *tsd, base_t *base_to_destroy) {
tsd, &pac->ecache_muzzy.mtx, delayed_mtx, &n_delayed);
arena_prepare_base_deletion_sync(
tsd, &pac->ecache_retained.mtx, delayed_mtx, &n_delayed);
arena_prepare_base_deletion_sync(
tsd, &pac->ecache_pinned.mtx, delayed_mtx, &n_delayed);
}
arena_prepare_base_deletion_sync_finish(tsd, delayed_mtx, n_delayed);
}