linux-kernel - Re: [RFC 5/5] Memory controller soft limit reclaim on contention

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Date:	Mon, 30 Jun 2008 13:41:19 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	Paul Menage <menage@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [RFC 5/5] Memory controller soft limit reclaim on contention

KOSAKI Motohiro wrote:
> yes, memcg used only one page.
> but mem_cgroup_reclaim_on_contention() reclaim for generic alloc_pages(), instead for memcg.
> we can't assume memcg usage.
> isn't it?

Yes, but the reclaim is from memcg pages (memcg groups that are over their soft
limit). I am not sure if I understand your point? If your claim is that we don't
free up pages of at-least order (as desired by __alloc_pages_internal()), that
is correct. We can ensure that we do a pass over memcg and generic zone LRU.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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