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Eagerly coalesce large extents.

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Coalescing is a small price to pay for large allocations since they happen less
frequently.  This reduces fragmentation while also potentially improving
locality.
This commit is contained in:
Qi Wang 2017-11-15 14:48:55 -08:00 committed by Qi Wang
parent eb1b08daae
commit 3e64dae802
1 changed files with 15 additions and 1 deletions
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16
src/extent.c
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@ -1586,8 +1586,22 @@ extent_record(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
if (!extents->delay_coalesce) {
extent = extent_try_coalesce(tsdn, arena, r_extent_hooks,
rtree_ctx, extents, extent, NULL, growing_retained);
} else if (extent_size_get(extent) >= LARGE_MINCLASS) {
/* Always coalesce large extents eagerly. */
bool coalesced;
size_t prev_size;
do {
prev_size = extent_size_get(extent);
assert(extent_state_get(extent) == extent_state_active);
extent = extent_try_coalesce(tsdn, arena,
r_extent_hooks, rtree_ctx, extents, extent,
&coalesced, growing_retained);
if (coalesced) {
extent_list_remove(&extents->lru, extent);
}
} while (coalesced &&
extent_size_get(extent) >= prev_size + LARGE_MINCLASS);
}
extent_deactivate_locked(tsdn, arena, extents, extent, false);
malloc_mutex_unlock(tsdn, &extents->mtx);