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From: Rakib Mullick <rakib.mullick@gmail.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: akpm@linux-foundation.org, Christoph Lameter <cl@linux.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
	Mel Gorman <mel@csn.ul.ie>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Subject: [PATCH] mm, vmstat: Use cond_resched only when !CONFIG_PREEMPT
Date: Mon, 30 May 2011 22:59:04 +0600	[thread overview]
Message-ID: <1306774744.4061.5.camel@localhost.localdomain> (raw)

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@gmail.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



WARNING: multiple messages have this Message-ID (diff)
From: Rakib Mullick <rakib.mullick@gmail.com>
To: linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: akpm@linux-foundation.org, Christoph Lameter <cl@linux.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
	Mel Gorman <mel@csn.ul.ie>,
	KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Subject: [PATCH] mm, vmstat: Use cond_resched only when !CONFIG_PREEMPT
Date: Mon, 30 May 2011 22:59:04 +0600	[thread overview]
Message-ID: <1306774744.4061.5.camel@localhost.localdomain> (raw)

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@gmail.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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             reply	other threads:[~2011-05-30 17:06 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-30 16:59 Rakib Mullick [this message]
2011-05-30 16:59 ` [PATCH] mm, vmstat: Use cond_resched only when !CONFIG_PREEMPT Rakib Mullick
2011-05-30 23:38 ` KAMEZAWA Hiroyuki
2011-05-30 23:38   ` KAMEZAWA Hiroyuki
2011-05-31  3:13   ` Rakib Mullick
2011-05-31  3:13     ` Rakib Mullick
2011-05-31  3:18     ` KAMEZAWA Hiroyuki
2011-05-31  3:18       ` KAMEZAWA Hiroyuki
2011-05-31  3:58       ` Rakib Mullick
2011-05-31  3:58         ` Rakib Mullick
2011-05-31  4:29         ` KAMEZAWA Hiroyuki
2011-05-31  4:29           ` KAMEZAWA Hiroyuki
2011-05-31  2:23 ` KOSAKI Motohiro
2011-05-31  2:23   ` KOSAKI Motohiro
2011-05-31  3:19   ` Rakib Mullick
2011-05-31  3:19     ` Rakib Mullick
2011-05-31  5:55 ` Minchan Kim
2011-05-31  5:55   ` Minchan Kim
2011-05-31  5:57   ` Minchan Kim
2011-05-31  5:57     ` Minchan Kim

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