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Over purge by 1 extent always.

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When purging, large allocations are usually the ones that cross the npages_limit
threshold, simply because they are "large".  This means we often leave the large
extent around for a while, which has the downsides of: 1) high RSS and 2) more
chance of them getting fragmented.  Given that they are not likely to be reused
very soon (LRU), let's over purge by 1 extent (which is often large and not
reused frequently).
This commit is contained in:
Qi Wang
2017-12-08 12:13:50 -08:00
committed by Qi Wang
parent f70785de91
commit 740bdd68b1
3 changed files with 5 additions and 8 deletions
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3
include/jemalloc/internal/extent_externs.h
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@@ -38,8 +38,7 @@ extent_t *extents_alloc(tsdn_t *tsdn, arena_t *arena,
void extents_dalloc(tsdn_t *tsdn, arena_t *arena,
extent_hooks_t **r_extent_hooks, extents_t *extents, extent_t *extent);
extent_t *extents_evict(tsdn_t *tsdn, arena_t *arena,
extent_hooks_t **r_extent_hooks, extents_t *extents, size_t npages_min,
size_t npages_max);
extent_hooks_t **r_extent_hooks, extents_t *extents, size_t npages_min);
void extents_prefork(tsdn_t *tsdn, extents_t *extents);
void extents_postfork_parent(tsdn_t *tsdn, extents_t *extents);
void extents_postfork_child(tsdn_t *tsdn, extents_t *extents);