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

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Message-Id: <20080403184351.42de4f56.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 3 Apr 2008 18:43:51 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Balbir Singh <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 15:02:53 +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.

> 2. It sets all cached pages as inactive. We were by default marking
>    all pages as active, thus forcing us to go through two passes for
>    reclaiming pages
Agreed.

> 3. Removes congestion_wait(), since we already have that logic in
>    do_try_to_free_pages()
> 
Agreed.

Thanks,
-Kame

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