Commit bf2b356a authored by Kent Overstreet's avatar Kent Overstreet
Browse files

bcachefs: Leave a buffer in the btree key cache to avoid lock thrashing 



Signed-off-by: default avatarKent Overstreet <kent.overstreet@linux.dev>
parent 2760bfe3

fs/bcachefs/btree_key_cache.c

+8 −0
Original line number Diff line number Diff line
@@ -915,6 +915,14 @@ static unsigned long bch2_btree_key_cache_count(struct shrinker *shrink, 
	long nr = atomic_long_read(&bc->nr_keys) -

		atomic_long_read(&bc->nr_dirty);



	/*

	 * Avoid hammering our shrinker too much if it's nearly empty - the

	 * shrinker code doesn't take into account how big our cache is, if it's

	 * mostly empty but the system is under memory pressure it causes nasty

	 * lock contention:

	 */

	nr -= 128;



	return max(0L, nr);

}