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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
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4
src/large.c
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@ -143,8 +143,8 @@ large_ralloc_no_move_expand(tsdn_t *tsdn, extent_t *extent, size_t usize,
extent_t *trail;
if ((trail = arena_extent_cache_alloc(tsdn, arena, &extent_hooks,
extent_past_get(extent), trailsize, CACHELINE, &is_zeroed_trail))
== NULL) {
extent_past_get(extent), trailsize, CACHELINE, &is_zeroed_trail)) ==
NULL) {
bool commit = true;
if ((trail = extent_alloc_wrapper(tsdn, arena, &extent_hooks,
extent_past_get(extent), trailsize, 0, CACHELINE,