From: Dimitri Sivanich <sivanich@sgi.com>
Date: Mon, 28 Apr 2008 09:13:37 +0000 (-0700)
Subject: vmstats: add cond_resched() to refresh_cpu_vm_stats()
X-Git-Tag: v2.6.26-rc1~925
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=468fd62ed9090ccbe872489df5d0d099510df4b5;p=linux-2.6

vmstats: add cond_resched() to refresh_cpu_vm_stats()

We've found that it can take quite a bit of time (100's of usec) to get
through the zone loop in refresh_cpu_vm_stats().

Adding a cond_resched() to allow other threads to run in the non-preemptive
case.

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 4c21670f8d..ec6035eda9 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -322,6 +322,7 @@ void refresh_cpu_vm_stats(int cpu)
 				p->expire = 3;
 #endif
 			}
+		cond_resched();
 #ifdef CONFIG_NUMA
 		/*
 		 * Deal with draining the remote pageset of this