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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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6
src/extent.c
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@ -481,7 +481,7 @@ extents_dalloc(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
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) {
extents_t *extents, size_t npages_min) {
rtree_ctx_t rtree_ctx_fallback;
rtree_ctx_t *rtree_ctx = tsdn_rtree_ctx(tsdn, &rtree_ctx_fallback);
@ -499,11 +499,9 @@ extents_evict(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
goto label_return;
}
/* Check the eviction limit. */
size_t npages = extent_size_get(extent) >> LG_PAGE;
size_t extents_npages = atomic_load_zu(&extents->npages,
ATOMIC_RELAXED);
if (extents_npages - npages < npages_min ||
npages > npages_max) {
if (extents_npages <= npages_min) {
extent = NULL;
goto label_return;
}