linux-kernel - Re: [PATCH][memcg+dirtylimit] Fix overwriting global vm dirty limit setting by memcg (Re: [PATCH v3 00/11] memcg: per cgroup dirty page accounting

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Message-Id: <20101020131427.a4998c33.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 20 Oct 2010 13:14:27 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Greg Thelen <gthelen@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	containers@...ts.osdl.org, Andrea Righi <arighi@...eler.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Minchan Kim <minchan.kim@...il.com>,
	Ciju Rajan K <ciju@...ux.vnet.ibm.com>,
	David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH][memcg+dirtylimit] Fix  overwriting global vm dirty
 limit setting by memcg (Re: [PATCH v3 00/11] memcg: per cgroup dirty page
 accounting

On Wed, 20 Oct 2010 12:21:44 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> 
> One bug fix here.
> ==
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 
> Now, at calculating dirty limit, vm_dirty_param() is called.
> This function returns dirty-limit related parameters considering
> memory cgroup settings.
> 
> Now, assume that vm_dirty_bytes=100M (global dirty limit) and
> memory cgroup has 1G of pages and 40 dirty_ratio, dirtyable memory is
> 500MB.
> 
> In this case, global_dirty_limits will consider dirty_limt as
> 500 *0.4 = 200MB. This is bad...memory cgroup is not back door.
> 
> This patch limits the return value of vm_dirty_param() considring
> global settings.
> 
> 

Sorry, this one is buggy. I'll post a new one later.

Thanks,
-Kame

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