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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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9
src/sec.c
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@ -4,7 +4,7 @@
#include "jemalloc/internal/sec.h"
static edata_t *sec_alloc(tsdn_t *tsdn, pai_t *self, size_t size,
size_t alignment, bool zero, bool *deferred_work_generated);
size_t alignment, bool zero, bool guarded, bool *deferred_work_generated);
static bool sec_expand(tsdn_t *tsdn, pai_t *self, edata_t *edata,
size_t old_size, size_t new_size, bool zero, bool *deferred_work_generated);
static bool sec_shrink(tsdn_t *tsdn, pai_t *self, edata_t *edata,
@ -218,8 +218,9 @@ sec_batch_fill_and_alloc(tsdn_t *tsdn, sec_t *sec, sec_shard_t *shard,
static edata_t *
sec_alloc(tsdn_t *tsdn, pai_t *self, size_t size, size_t alignment, bool zero,
bool *deferred_work_generated) {
bool guarded, bool *deferred_work_generated) {
assert((size & PAGE_MASK) == 0);
assert(!guarded);
sec_t *sec = (sec_t *)self;
*deferred_work_generated = false;
@ -227,7 +228,7 @@ sec_alloc(tsdn_t *tsdn, pai_t *self, size_t size, size_t alignment, bool zero,
if (zero || alignment > PAGE || sec->opts.nshards == 0
|| size > sec->opts.max_alloc) {
return pai_alloc(tsdn, sec->fallback, size, alignment, zero,
deferred_work_generated);
/* guarded */ false, deferred_work_generated);
}
pszind_t pszind = sz_psz2ind(size);
sec_shard_t *shard = sec_shard_pick(tsdn, sec);
@ -250,7 +251,7 @@ sec_alloc(tsdn_t *tsdn, pai_t *self, size_t size, size_t alignment, bool zero,
size);
} else {
edata = pai_alloc(tsdn, sec->fallback, size, alignment,
zero, deferred_work_generated);
zero, /* guarded */ false, deferred_work_generated);
}
}
return edata;