linux-kernel - [RFC][PATCH 8/8] extends soft limit event filter

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Message-Id: <20090327141322.6606cabe.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 27 Mar 2009 14:13:22 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"balbir@...ux.vnet.ibm.com" <balbir@...ux.vnet.ibm.com>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>
Subject: [RFC][PATCH 8/8] extends soft limit event filter

Reduce softlimit update ratio depends on its priority(usage).

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
---
 mm/memcontrol.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Index: mmotm-2.6.29-Mar23/mm/memcontrol.c
===================================================================
--- mmotm-2.6.29-Mar23.orig/mm/memcontrol.c
+++ mmotm-2.6.29-Mar23/mm/memcontrol.c
@@ -945,11 +945,15 @@ static bool mem_cgroup_soft_limit_check(
 	bool ret = false;
 	int cpu = get_cpu();
 	s64 val;
+	int thresh;
 	struct mem_cgroup_stat_cpu *cpustat;
 
 	cpustat = &mem->stat.cpustat[cpu];
 	val = __mem_cgroup_stat_read_local(cpustat, MEM_CGROUP_STAT_EVENTS);
-	if (unlikely(val > SOFTLIMIT_EVENTS_THRESH)) {
+	/* If usage is big, this check can be rough */
+	thresh = SOFTLIMIT_EVENTS_THRESH;
+	thresh <<= (mem->soft_limit_priority >> 1);
+	if (unlikely(val > thresh)) {
 		__mem_cgroup_stat_reset_safe(cpustat, MEM_CGROUP_STAT_EVENTS);
 		ret = true;
 	}

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