From: Rik van Riel <riel@redhat.com>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: Robin Holt <holt@sgi.com>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
LKML <linux-kernel@vger.kernel.org>,
linux-mm <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 4/4] zone_reclaim_mode is always 0 by default
Date: Thu, 14 May 2009 16:23:18 -0400 [thread overview]
Message-ID: <4A0C7DB6.6010601@redhat.com> (raw)
In-Reply-To: <alpine.DEB.1.10.0905141602010.1381@qirst.com>
Christoph Lameter wrote:
> Not having zone reclaim on a NUMA system often means that per node
> allocations will fall back. Optimized node local allocations become very
> difficult for the page allocator. If the latency penalties are not
> significant then this may not matter. The larger the system, the larger
> the NUMA latencies become.
>
> One possibility would be to disable zone reclaim for low node numbers.
> Eanble it only if more than 4 nodes exist?
I suspect that patches 1/4 through 3/4 will cause the
system to behave better already, by only reclaiming
the easiest to reclaim pages from zone reclaim and
falling back after that - or am overlooking something?
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next prev parent reply other threads:[~2009-05-14 20:23 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-13 3:06 [PATCH 0/4] various zone_reclaim cleanup KOSAKI Motohiro
2009-05-13 3:06 ` [PATCH 1/4] vmscan: change the number of the unmapped files in zone reclaim KOSAKI Motohiro
2009-05-13 13:31 ` Rik van Riel
2009-05-14 19:52 ` Christoph Lameter
2009-05-18 3:15 ` Wu Fengguang
2009-05-18 3:35 ` KOSAKI Motohiro
2009-05-18 3:53 ` Wu Fengguang
2009-05-19 1:11 ` KOSAKI Motohiro
2009-05-13 3:06 ` [PATCH 2/4] vmscan: drop PF_SWAPWRITE from zone_reclaim KOSAKI Motohiro
2009-05-13 13:35 ` Rik van Riel
2009-05-14 19:57 ` Christoph Lameter
2009-05-18 3:33 ` Wu Fengguang
2009-05-13 3:07 ` [PATCH 3/4] vmscan: zone_reclaim use may_swap KOSAKI Motohiro
2009-05-13 11:26 ` Johannes Weiner
2009-05-13 14:43 ` Rik van Riel
2009-05-14 19:59 ` Christoph Lameter
2009-05-18 3:35 ` Wu Fengguang
2009-05-13 3:08 ` [PATCH 4/4] zone_reclaim_mode is always 0 by default KOSAKI Motohiro
2009-05-13 14:47 ` Rik van Riel
2009-05-14 8:20 ` KOSAKI Motohiro
2009-05-14 11:48 ` Robin Holt
2009-05-14 12:02 ` KOSAKI Motohiro
2009-05-13 15:22 ` Robin Holt
2009-05-14 20:05 ` Christoph Lameter
2009-05-14 20:23 ` Rik van Riel [this message]
2009-05-14 20:31 ` Christoph Lameter
2009-05-15 1:02 ` KOSAKI Motohiro
2009-05-15 10:51 ` Robin Holt
2009-05-19 2:53 ` KOSAKI Motohiro
2009-05-20 14:00 ` Robin Holt
2009-05-21 2:44 ` KOSAKI Motohiro
2009-05-21 13:31 ` Christoph Lameter
2009-05-21 13:57 ` Robin Holt
2009-05-24 13:44 ` KOSAKI Motohiro
2009-05-15 18:01 ` Christoph Lameter
2009-05-18 3:49 ` Wu Fengguang
2009-05-19 1:16 ` Zhang, Yanmin
2009-05-19 2:53 ` KOSAKI Motohiro
2009-05-19 2:57 ` KOSAKI Motohiro
2009-05-19 3:38 ` Zhang, Yanmin
2009-05-19 4:30 ` KOSAKI Motohiro
2009-05-19 5:06 ` Zhang, Yanmin
2009-05-19 7:09 ` KOSAKI Motohiro
2009-05-19 7:15 ` Zhang, Yanmin
2009-05-18 9:09 ` Wu Fengguang
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