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

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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-06-07 14:25:18 -04:00
parent 2760bfe388
commit bf2b356afd
1 changed files with 8 additions and 0 deletions
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8
fs/bcachefs/btree_key_cache.c
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@ -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);
}