From: Kirill Korotaev <dev@openvz.org>
Date: Sat, 25 Mar 2006 11:07:45 +0000 (-0800)
Subject: [PATCH] Reduce sched latency in shrink_dcache_sb()
X-Git-Tag: firefly_0821_release~37212
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2ab13460852e65c2ec0e77000baba5e859a6a2cf;p=firefly-linux-kernel-4.4.55.git

[PATCH] Reduce sched latency in shrink_dcache_sb()

This patch reduces scheduling latency in shrink_dcache_sb() noticed during
remounting of big partitions with many cached dentries.  The same latency
fix was applied to select_parent() long ago.

Signed-off-by: Denis Lunev <den@sw.ru>
Signed-off-by: Pavel Emelianov <xemul@sw.ru>
Signed-off-by: Kirill Korotaev <dev@openvz.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/fs/dcache.c b/fs/dcache.c
index 0f7ec12d65ff..939584648504 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -489,6 +489,7 @@ repeat:
 			continue;
 		}
 		prune_one_dentry(dentry);
+		cond_resched_lock(&dcache_lock);
 		goto repeat;
 	}
 	spin_unlock(&dcache_lock);