linux-kernel - Re: [PATCH 1/6] res_counter: handle limit change

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Message-ID: <48562AFF.9050804@linux.vnet.ibm.com>
Date:	Mon, 16 Jun 2008 14:27:35 +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>,
	LKML <linux-kernel@...r.kernel.org>,
	"menage@...gle.com" <menage@...gle.com>,
	"xemul@...nvz.org" <xemul@...nvz.org>,
	"yamamoto@...inux.co.jp" <yamamoto@...inux.co.jp>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>
Subject: Re: [PATCH 1/6] res_counter:  handle limit change

KAMEZAWA Hiroyuki wrote:
> Add a support to shrink_usage_at_limit_change feature to res_counter.
> memcg will use this to drop pages.
> 
> Change log: xxx -> v4 (new file.)
>  - cut out the limit-change part from hierarchy patch set.
>  - add "retry_count" arguments to shrink_usage(). This allows that we don't
>    have to set the default retry loop count.
>  - res_counter_check_under_val() is added to support subsystem.
>  - res_counter_init() is res_counter_init_ops(cnt, NULL)
> 
> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> 

Does shrink_usage() really belong to res_counters? Could a task limiter, a
CPU/IO bandwidth controller use this callback? Resource Counters were designed
to be generic and work across controllers. Isn't the memory controller a better
place for such ops.

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