From: Balbir Singh <balbir@linux.vnet.ibm.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: robm@fastmail.fm, linux-kernel@vger.kernel.org,
Bron Gondwana <brong@fastmail.fm>, linux-mm <linux-mm@kvack.org>,
Christoph Lameter <cl@linux-foundation.org>,
Mel Gorman <mel@csn.ul.ie>
Subject: Re: Default zone_reclaim_mode = 1 on NUMA kernel is bad for file/email/web servers
Date: Thu, 23 Sep 2010 17:14:42 +0530 [thread overview]
Message-ID: <20100923114442.GK3952@balbir.in.ibm.com> (raw)
In-Reply-To: <20100916184240.3BC9.A69D9226@jp.fujitsu.com>
* KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> [2010-09-16 19:01:32]:
> + if (!(zone_reclaim_mode & RECLAIM_CACHE) &&
> + (gfp_mask & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK) {
> + inc_zone_state(zone, NR_ZONE_CACHE_AVOID);
> + goto try_next_zone;
> + }
> +
Interesting approach, so for page cache related applications we expect
RECLAIM_CACHE to be set and hence zone_reclaim to occur. I have
another variation, a new gfp flag called __GFP_FREE_CACHE. You can
find the patches at
http://lwn.net/Articles/391293/
http://article.gmane.org/gmane.linux.kernel.mm/49155
--
Three Cheers,
Balbir
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next prev parent reply other threads:[~2010-09-23 11:44 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1284349152.15254.1394658481@webmail.messagingengine.com>
2010-09-16 10:01 ` Default zone_reclaim_mode = 1 on NUMA kernel is bad for file/email/web servers KOSAKI Motohiro
2010-09-16 17:06 ` Christoph Lameter
2010-09-17 0:50 ` Robert Mueller
2010-09-17 6:01 ` Shaohua Li
2010-09-17 7:32 ` Robert Mueller
2010-09-17 13:56 ` Christoph Lameter
2010-09-17 14:09 ` Bron Gondwana
2010-09-17 14:22 ` Christoph Lameter
2010-09-17 23:01 ` Bron Gondwana
2010-09-20 9:34 ` Mel Gorman
2010-09-20 23:41 ` Default zone_reclaim_mode = 1 on NUMA kernel is bad forfile/email/web servers Rob Mueller
2010-09-21 9:04 ` Mel Gorman
2010-09-21 14:14 ` Christoph Lameter
2010-09-22 3:44 ` Rob Mueller
2010-09-27 2:01 ` KOSAKI Motohiro
2010-09-27 13:53 ` Christoph Lameter
2010-09-27 23:17 ` Robert Mueller
2010-09-28 12:35 ` Christoph Lameter
2010-09-28 12:42 ` Bron Gondwana
2010-09-28 12:49 ` Christoph Lameter
2010-09-30 7:05 ` Andi Kleen
2010-10-04 12:45 ` KOSAKI Motohiro
2010-10-04 13:07 ` Christoph Lameter
2010-10-05 5:32 ` KOSAKI Motohiro
2010-10-04 19:43 ` David Rientjes
2010-09-21 1:05 ` Default zone_reclaim_mode = 1 on NUMA kernel is bad for file/email/web servers KAMEZAWA Hiroyuki
2010-09-27 2:04 ` KOSAKI Motohiro
2010-09-27 2:06 ` KAMEZAWA Hiroyuki
2010-09-23 11:44 ` Balbir Singh [this message]
2010-09-30 8:38 ` Bron Gondwana
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