From: David Rientjes <rientjes@google.com>
To: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Rik van Riel <riel@redhat.com>,
Lee Schermerhorn <Lee.Schermerhorn@hp.com>,
Nick Piggin <npiggin@suse.de>
Subject: Re: [RFC][PATCH] page reclaim throttle take2
Date: Wed, 27 Feb 2008 00:47:17 -0800 (PST) [thread overview]
Message-ID: <alpine.DEB.1.00.0802270045400.31372@chino.kir.corp.google.com> (raw)
In-Reply-To: <47C51856.7060408@linux.vnet.ibm.com>
On Wed, 27 Feb 2008, Balbir Singh wrote:
> Let's forget node hotplug for the moment, but what if someone
>
> 1. Changes the machine configuration and adds more nodes, do we expect the
> kernel to be recompiled? Or is it easier to update /etc/sysctl.conf?
> 2. Uses fake NUMA nodes and increases/decreases the number of nodes across
> reboots. Should the kernel be recompiled?
>
That is why the proposal was made to make this a static configuration
option, such as CONFIG_NUM_RECLAIM_THREADS_PER_NODE, that will handle both
situations.
> I am afraid it doesn't. Consider as you scale number of CPU's with the same
> amount of memory, we'll end up making the reclaim problem worse.
>
The benchmark that have been posted suggest that memory locality is more
important than lock contention, as I've already mentioned.
David
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next prev parent reply other threads:[~2008-02-27 8:47 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-02-26 2:32 KOSAKI Motohiro
2008-02-26 21:18 ` Peter Zijlstra
2008-02-27 0:50 ` KAMEZAWA Hiroyuki
2008-02-27 4:26 ` KOSAKI Motohiro
2008-02-27 4:27 ` Balbir Singh
2008-02-27 4:45 ` KOSAKI Motohiro
2008-02-27 5:00 ` KAMEZAWA Hiroyuki
2008-02-27 5:04 ` KOSAKI Motohiro
2008-02-27 5:03 ` Balbir Singh
2008-02-27 5:13 ` KOSAKI Motohiro
2008-02-27 5:19 ` David Rientjes
2008-02-27 5:33 ` KOSAKI Motohiro
2008-02-27 5:47 ` David Rientjes
2008-02-27 5:48 ` Balbir Singh
2008-02-27 6:09 ` David Rientjes
2008-02-27 7:10 ` KOSAKI Motohiro
2008-02-27 7:19 ` David Rientjes
2008-02-27 7:51 ` KAMEZAWA Hiroyuki
2008-02-27 7:56 ` David Rientjes
2008-02-27 8:09 ` KAMEZAWA Hiroyuki
2008-02-27 15:30 ` Rik van Riel
2008-02-27 7:59 ` Balbir Singh
2008-02-27 8:47 ` David Rientjes [this message]
2008-02-27 9:01 ` Balbir Singh
2008-02-27 9:44 ` Peter Zijlstra
2008-02-27 6:52 ` KOSAKI Motohiro
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