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Fix unbounded increase in stash_decayed.

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Added an upper bound on how many pages we can decay during the current run.
Without this, decay could have unbounded increase in stashed, since other
threads could add new pages into the extents.
This commit is contained in:
Qi Wang 2017-11-08 13:59:21 -08:00 • committed by Qi Wang
parent 6dd5681ab7
commit b5d071c266
3 changed files with 23 additions and 15 deletions
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5
src/extent.c
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@ -472,7 +472,7 @@ 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) {
extents_t *extents, size_t npages_min, size_t npages_max) {
rtree_ctx_t rtree_ctx_fallback;
rtree_ctx_t *rtree_ctx = tsdn_rtree_ctx(tsdn, &rtree_ctx_fallback);
@ -493,7 +493,8 @@ extents_evict(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
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) {
if (extents_npages - npages < npages_min ||
npages > npages_max) {
extent = NULL;
goto label_return;
}