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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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5
src/base.c
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@ -52,8 +52,9 @@ base_map(tsdn_t *tsdn, ehooks_t *ehooks, unsigned ind, size_t size) {
if (ehooks_are_default(ehooks)) {
addr = extent_alloc_mmap(NULL, size, alignment, &zero, &commit);
} else {
addr = ehooks_alloc(
tsdn, ehooks, NULL, size, alignment, &zero, &commit);
UNUSED unsigned flags;
addr = ehooks_alloc(tsdn, ehooks, NULL, size, alignment, &zero,
&commit, &flags);
}
return addr;