linux-kernel - Re: [-mm] Make the memory controller more desktop responsive

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Date:	Thu, 3 Apr 2008 18:55:55 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Hugh Dickins <hugh@...itas.com>,
	Sudhir Kumar <skumar@...ux.vnet.ibm.com>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	Paul Menage <menage@...gle.com>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org, taka@...inux.co.jp,
	linux-mm@...ck.org, David Rientjes <rientjes@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>
Subject: Re: [-mm] Make the memory controller more desktop responsive

On Thu, 03 Apr 2008 15:14:32 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> KAMEZAWA Hiroyuki wrote:
> > On Thu, 03 Apr 2008 15:02:53 +0530
> > Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
> >> This patch makes the memory controller more responsive on my desktop.
> >>
> >> Here is what the patch does
> >>
> >> 1. Reduces the number of retries to 2. We had 5 earlier, since we
> >>    were controlling swap cache as well. We pushed data from mappings
> >>    to swap cache and we needed additional passes to clear out the cache.
> > 
> > Hmm, what this change improves ?
> > I don't want to see OOM.
> > 
> 
> I had set it to 5 earlier, since the swap cache came back to our memory
> controller, where it was accounted. I have not seen OOM with it on my desktop,
> but at some point if the memory required is so much that we cannot fulfill it,
> we do OOM. I have not seen any OOM so far with these changes.
> 
Hmm, I'm now testing swap-cache accounting patch.
It seems I should check this value again.

Thanks,
-Kame

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