linux-kernel - Re: [RFC][PATCH 0/7][memcg] towards I/O aware memory cgroup

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Message-ID: <20100728144229.GD14369@balbir.in.ibm.com>
Date:	Wed, 28 Jul 2010 20:12:29 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	gthelen@...gle.com, m-ikeda@...jp.nec.com,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 0/7][memcg] towards I/O aware memory cgroup

* KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2010-07-27 16:51:55]:

> 
> From a view of patch management, this set is a mixture of a few features for
> memcg, and I should divide them to some groups. But, at first, I'd like to
> show the total view. This set is consists from 5 sets. Main purpose is
> create a room in page_cgroup for I/O tracking and add light-weight access method
> for file-cache related accounting. 
> 
> 1.   An virtual-indexed array.
> 2,3. Use virtual-indexed array for id-to-memory_cgroup detection.
> 4.   modify page_cgroup to use ID instead of pointer, this gives us enough
>      spaces for further memory tracking.

Yes, this is good, I've been meaning to merge the flags and the
pointer. Thanks for looking into this.

> 5,6   Use light-weight locking mechanism for file related accounting.
> 7.   use spin_lock instead of bit_spinlock.
> 
> 
> As a function,  patch 5,6 can be an independent patch and I'll accept
> reordering series of patch if someone requests.
> But we'll need all, I think.
> (irq_save for patch 7 will be required later.)
> 

-- 
	Three Cheers,
	Balbir
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