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Refactor purging and splitting/merging.

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Split purging into lazy and forced variants.  Use the forced variant for
zeroing dss.

Add support for NULL function pointers as an opt-out mechanism for the
dalloc, commit, decommit, purge_lazy, purge_forced, split, and merge
fields of extent_hooks_t.

Add short-circuiting checks in large_ralloc_no_move_{shrink,expand}() so
that no attempt is made if splitting/merging is not supported.

This resolves #268.
This commit is contained in:
Jason Evans
2016-12-03 15:38:25 -08:00
parent 884fa22b8c
commit a6e86810d8
11 changed files with 258 additions and 84 deletions
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35
include/jemalloc/internal/pages.h
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@@ -24,6 +24,23 @@
#define HUGEPAGE_CEILING(s) \
(((s) + HUGEPAGE_MASK) & ~HUGEPAGE_MASK)
/* PAGES_CAN_PURGE_LAZY is defined if lazy purging is supported. */
#if defined(_WIN32) || defined(JEMALLOC_PURGE_MADVISE_FREE)
# define PAGES_CAN_PURGE_LAZY
#endif
/*
* PAGES_CAN_PURGE_FORCED is defined if forced purging is supported.
*
* The only supported way to hard-purge on Windows is to decommit and then
* re-commit, but doing so is racy, and if re-commit fails it's a pain to
* propagate the "poisoned" memory state. Since we typically decommit as the
* next step after purging on Windows anyway, there's no point in adding such
* complexity.
*/
#if !defined(_WIN32) && defined(JEMALLOC_PURGE_MADVISE_DONTNEED)
# define PAGES_CAN_PURGE_FORCED
#endif
#endif /* JEMALLOC_H_TYPES */
/******************************************************************************/
#ifdef JEMALLOC_H_STRUCTS
@@ -32,13 +49,29 @@
/******************************************************************************/
#ifdef JEMALLOC_H_EXTERNS
static const bool pages_can_purge_lazy =
#ifdef PAGES_CAN_PURGE_LAZY
true
#else
false
#endif
;
static const bool pages_can_purge_forced =
#ifdef PAGES_CAN_PURGE_FORCED
true
#else
false
#endif
;
void *pages_map(void *addr, size_t size, bool *commit);
void pages_unmap(void *addr, size_t size);
void *pages_trim(void *addr, size_t alloc_size, size_t leadsize,
size_t size, bool *commit);
bool pages_commit(void *addr, size_t size);
bool pages_decommit(void *addr, size_t size);
bool pages_purge(void *addr, size_t size);
bool pages_purge_lazy(void *addr, size_t size);
bool pages_purge_forced(void *addr, size_t size);
bool pages_huge(void *addr, size_t size);
bool pages_nohuge(void *addr, size_t size);
void pages_boot(void);