From: David Rientjes <rientjes@google.com>
Date: Wed, 28 Dec 2022 06:05:48 +0000 (-0800)
Subject: mm, slab: periodically resched in drain_freelist()
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=cc2e9d2b26c86c1dd8687f6916e5f621bcacd6f7;p=linux.git

mm, slab: periodically resched in drain_freelist()

drain_freelist() can be called with a very large number of slabs to free,
such as for kmem_cache_shrink(), or depending on various settings of the
slab cache when doing periodic reaping.

If there is a potentially long list of slabs to drain, periodically
schedule to ensure we aren't saturating the cpu for too long.

Signed-off-by: David Rientjes <rientjes@google.com>
Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
---

diff --git a/mm/slab.c b/mm/slab.c
index 7a269db050eed..29300fc1289a8 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2211,6 +2211,8 @@ static int drain_freelist(struct kmem_cache *cache,
 		raw_spin_unlock_irq(&n->list_lock);
 		slab_destroy(cache, slab);
 		nr_freed++;
+
+		cond_resched();
 	}
 out:
 	return nr_freed;