linux-kernel - Re: [patch 2/2] mm: memcg: hierarchical soft limit reclaim

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Message-ID: <4F17BA58.2090403@gmail.com>
Date:	Thu, 19 Jan 2012 14:38:16 +0800
From:	Sha <handai.szj@...il.com>
To:	Michal Hocko <mhocko@...e.cz>
CC:	Johannes Weiner <hannes@...xchg.org>,
	Ying Han <yinghan@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <bsingharora@...il.com>, cgroups@...r.kernel.org,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [patch 2/2] mm: memcg: hierarchical soft limit reclaim

On 01/18/2012 11:27 PM, Michal Hocko wrote:
> On Wed 18-01-12 19:25:27, Sha wrote:
> [...]
>> Er... I'm even more confused: mem_cgroup_soft_limit_reclaim indeed
>> choses the biggest soft-limit excessor first, but in the succeeding reclaim
>> mem_cgroup_hierarchical_reclaim just selects a child cgroup  by css_id
> mem_cgroup_soft_limit_reclaim picks up the hierarchy root (most
> excessing one) and mem_cgroup_hierarchical_reclaim reclaims from that
> subtree). It doesn't care who exceeds the soft limit under that
> hierarchy it just tries to push the root under its limit as much as it
> can. This is what Johannes tried to explain in the other email in the
> thred.
yeah, I finally twig what  he meant... I'm not quite familiar with this 
part.
Thanks a lot for the explanation. :-)

Sha
>> which has nothing to do with soft limit (see mem_cgroup_select_victim).
>> IMHO, it's not a genuine hierarchical reclaim.
> It is hierarchical because it iterates over hierarchy it is not and
> never was recursively soft-hierarchical...
>

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