linux-kernel - Re: [PATCH 11/11] memcg: show reclaim

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Message-ID: <17466.10.75.179.62.1228320932.squirrel@webmail-b.css.fujitsu.com>
Date:	Thu, 4 Dec 2008 01:15:32 +0900 (JST)
From:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>,
	"LKML" <linux-kernel@...r.kernel.org>,
	"linux-mm" <linux-mm@...ck.org>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Rik van Riel" <riel@...hat.com>
Subject: Re: [PATCH 11/11] memcg: show reclaim_stat

Balbir Singh said:
> * KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> [2008-12-02
> 18:05:25]:
>
>> On Mon,  1 Dec 2008 21:19:49 +0900 (JST)
>> KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:
>>
>> > added following four field to memory.stat file.
>> >
>> >   - recent_rotated_anon
>> >   - recent_rotated_file
>> >   - recent_scanned_anon
>> >   - recent_scanned_file
>> >
>> > it is useful for memcg reclaim debugging.
>> >
>> I'll put this under CONFIG_DEBUG_VM.
>>
>
> I think they'll be useful even outside for tasks that need to take
> decisions, it will be nice to see what sort of reclaim is going on.
There are already pgin/pgout value.

> I
> would like to see them outside, there is no cost associated with them
> and assuming we'll not change the LRU logic very frequently, we don't
> need to be afraid of breaking ABI either :)
>
There are 2 reasons to put this under DEBUG
 1. This is not exported as this value under /proc by global VM management.
 2. Few people can explain what this really means. No documentation in
    Docunemtation/ directory. I can't add precise explanation by myself.
    As Kosaki wrote, this is for his debug, IMHO.

If you want to show this, please add above two first.

Thanks,
-Kame







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