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

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Date:	Mon, 16 Jun 2008 12:59:23 +0400
From:	Pavel Emelyanov <xemul@...nvz.org>
To:	balbir@...ux.vnet.ibm.com
CC:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"menage@...gle.com" <menage@...gle.com>,
	"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

Balbir Singh wrote:
> 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.

Well, this was my point, I just couldn't express this in an understandable manner.
We're discussing this right now :)

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