linux-kernel - [PATCH] mm, vmstat: Use cond_resched only when !CONFIG

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Date:	Mon, 30 May 2011 22:59:04 +0600
From:	Rakib Mullick <rakib.mullick@...il.com>
To:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:	akpm@...ux-foundation.org, Christoph Lameter <cl@...ux.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: [PATCH] mm, vmstat: Use cond_resched only when !CONFIG_PREEMPT

commit 468fd62ed9 (vmstats: add cond_resched() to refresh_cpu_vm_stats()) added cond_resched() in refresh_cpu_vm_stats. Purpose of that patch was to allow other threads to run in non-preemptive case. This patch, makes sure that cond_resched() gets called when !CONFIG_PREEMPT is set. In a preemptiable kernel we don't need to call cond_resched().

Signed-off-by: Rakib Mullick <rakib.mullick@...il.com>
---

diff --git a/mm/vmstat.c b/mm/vmstat.c
index 20c18b7..72cf857 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -461,7 +461,11 @@ void refresh_cpu_vm_stats(int cpu)
 				p->expire = 3;
 #endif
 			}
+
+#ifndef CONFIG_PREEMPT
 		cond_resched();
+#endif
+
 #ifdef CONFIG_NUMA
 		/*
 		 * Deal with draining the remote pageset of this


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