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Eagerly purge oversized merged extents.

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This change improves memory usage slightly, at virtually no CPU cost.
This commit is contained in:
Qi Wang 2019-03-12 15:02:41 -07:00 • committed by Qi Wang
parent f6c30cbafa
commit fb56766ca9
3 changed files with 36 additions and 3 deletions
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7
src/extent.c
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@ -1708,6 +1708,7 @@ extent_record(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
extent = extent_try_coalesce(tsdn, arena, r_extent_hooks,
rtree_ctx, extents, extent, NULL, growing_retained);
} else if (extent_size_get(extent) >= SC_LARGE_MINCLASS) {
assert(extents == &arena->extents_dirty);
/* Always coalesce large extents eagerly. */
bool coalesced;
do {
@ -1716,6 +1717,12 @@ extent_record(tsdn_t *tsdn, arena_t *arena, extent_hooks_t **r_extent_hooks,
r_extent_hooks, rtree_ctx, extents, extent,
&coalesced, growing_retained);
} while (coalesced);
if (extent_size_get(extent) >= oversize_threshold) {
/* Shortcut to purge the oversize extent eagerly. */
malloc_mutex_unlock(tsdn, &extents->mtx);
arena_decay_extent(tsdn, arena, r_extent_hooks, extent);
return;
}
}
extent_deactivate_locked(tsdn, arena, extents, extent);