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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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13
include/jemalloc/internal/ecache.h
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@ -2,12 +2,14 @@
#define JEMALLOC_INTERNAL_ECACHE_H
#include "jemalloc/internal/eset.h"
#include "jemalloc/internal/guard.h"
#include "jemalloc/internal/mutex.h"
typedef struct ecache_s ecache_t;
struct ecache_s {
malloc_mutex_t mtx;
eset_t eset;
eset_t guarded_eset;
/* All stored extents must be in the same state. */
extent_state_t state;
/* The index of the ehooks the ecache is associated with. */
@ -21,17 +23,22 @@ struct ecache_s {
static inline size_t
ecache_npages_get(ecache_t *ecache) {
return eset_npages_get(&ecache->eset);
return eset_npages_get(&ecache->eset) +
eset_npages_get(&ecache->guarded_eset);
}
/* Get the number of extents in the given page size index. */
static inline size_t
ecache_nextents_get(ecache_t *ecache, pszind_t ind) {
return eset_nextents_get(&ecache->eset, ind);
return eset_nextents_get(&ecache->eset, ind) +
eset_nextents_get(&ecache->guarded_eset, ind);
}
/* Get the sum total bytes of the extents in the given page size index. */
static inline size_t
ecache_nbytes_get(ecache_t *ecache, pszind_t ind) {
return eset_nbytes_get(&ecache->eset, ind);
return eset_nbytes_get(&ecache->eset, ind) +
eset_nbytes_get(&ecache->guarded_eset, ind);
}
static inline unsigned