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Fix extent_alloc_cache[_locked]() to support decommitted allocation.

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Fix extent_alloc_cache[_locked]() to support decommitted allocation, and
use this ability in arena_stash_dirty(), so that decommitted extents are
not needlessly committed during purging.  In practice this does not
happen on any currently supported systems, because both extent merging
and decommit must be implemented; all supported systems implement one
xor the other.
This commit is contained in:
Jason Evans 2016-11-03 17:25:54 -07:00
parent 4f7d8c2dee
commit 8dd5ea87ca
4 changed files with 19 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

11
src/arena.c
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@ -49,11 +49,12 @@ arena_extent_cache_alloc_locked(tsdn_t *tsdn, arena_t *arena,
extent_hooks_t **r_extent_hooks, void *new_addr, size_t usize, size_t pad,
size_t alignment, bool *zero, bool slab)
{
bool commit = true;
malloc_mutex_assert_owner(tsdn, &arena->lock);
return (extent_alloc_cache(tsdn, arena, r_extent_hooks, new_addr, usize,
pad, alignment, zero, slab));
pad, alignment, zero, &commit, slab));
}
extent_t *
@ -681,7 +682,7 @@ arena_stash_dirty(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
for (extent = qr_next(&arena->extents_dirty, qr_link); extent !=
&arena->extents_dirty; extent = next) {
size_t npages;
bool zero;
bool zero, commit;
UNUSED extent_t *textent;
npages = extent_size_get(extent) >> LG_PAGE;
@ -691,9 +692,10 @@ arena_stash_dirty(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
next = qr_next(extent, qr_link);
/* Allocate. */
zero = false;
commit = false;
textent = extent_alloc_cache_locked(tsdn, arena, r_extent_hooks,
extent_base_get(extent), extent_size_get(extent), 0, PAGE,
&zero, false);
&zero, &commit, false);
assert(textent == extent);
assert(zero == extent_zeroed_get(extent));
extent_ring_remove(extent);
@ -943,9 +945,8 @@ arena_slab_alloc(tsdn_t *tsdn, arena_t *arena, szind_t binind,
extent_t *slab;
arena_slab_data_t *slab_data;
extent_hooks_t *extent_hooks = EXTENT_HOOKS_INITIALIZER;
bool zero;
bool zero = false;
zero = false;
slab = arena_extent_cache_alloc_locked(tsdn, arena, &extent_hooks, NULL,
bin_info->slab_size, 0, PAGE, &zero, true);
if (slab == NULL) {