linux-kernel - Re: [RFC][mm] [PATCH 3/4] Memory cgroup hierarchical reclaim (v3)

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Message-ID: <491A7637.3050402@linux.vnet.ibm.com>
Date:	Wed, 12 Nov 2008 11:52:47 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
CC:	linux-mm@...ck.org, YAMAMOTO Takashi <yamamoto@...inux.co.jp>,
	Paul Menage <menage@...gle.com>, lizf@...fujitsu.com,
	linux-kernel@...r.kernel.org,
	Nick Piggin <nickpiggin@...oo.com.au>,
	David Rientjes <rientjes@...gle.com>,
	Pavel Emelianov <xemul@...nvz.org>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC][mm] [PATCH 3/4] Memory cgroup hierarchical reclaim (v3)

KAMEZAWA Hiroyuki wrote:
> On Wed, 12 Nov 2008 11:40:13 +0530
> Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
>> I think of it as easy to update - as in the modularity, you can plug out
>> hierarchical reclaim easily and implement your own hierarchical reclaim.
>>
> When I do so, I'll rewrite all, again.
> 

I don't intend to ask you to rewrite it, rewrite all, I meant you as in a
generic person. With hierarchy we will need weighted reclaim, which I'll add in
later.

>>> Can you make this code iterative rather than recursive ?
>>>
>>> I don't like this kind of recursive call with complexed lock/unlock.
>> I tried an iterative version, which ended up looking very ugly. I think the
>> recursive version is easier to understand. What we do is a DFS walk - pretty
>> standard algorithm.
>>
> But recursive one is not good for search-and-try algorithm.

OK, I'll post the iterative algorithm, but it is going to be dirty :)

-- 
	Balbir
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