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Implement guard pages.

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Adding guarded extents, which are regular extents surrounded by guard pages
(mprotected).  To reduce syscalls, small guarded extents are cached as a
separate eset in ecache, and decay through the dirty / muzzy / retained pipeline
as usual.
This commit is contained in:
Qi Wang 2021-04-26 14:22:25 -07:00 • committed by Qi Wang
parent 7bb05e04be
commit deb8e62a83
41 changed files with 920 additions and 251 deletions
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4
include/jemalloc/internal/extent.h
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@ -21,10 +21,10 @@ extern size_t opt_lg_extent_max_active_fit;
edata_t *ecache_alloc(tsdn_t *tsdn, pac_t *pac, ehooks_t *ehooks,
ecache_t *ecache, edata_t *expand_edata, size_t size, size_t alignment,
bool zero);
bool zero, bool guarded);
edata_t *ecache_alloc_grow(tsdn_t *tsdn, pac_t *pac, ehooks_t *ehooks,
ecache_t *ecache, edata_t *expand_edata, size_t size, size_t alignment,
bool zero);
bool zero, bool guarded);
void ecache_dalloc(tsdn_t *tsdn, pac_t *pac, ehooks_t *ehooks,
ecache_t *ecache, edata_t *edata);
edata_t *ecache_evict(tsdn_t *tsdn, pac_t *pac, ehooks_t *ehooks,