linux-kernel - Re: [RFC][PATCH 2/5] add softlimit to res

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Message-Id: <20090312131419.5250cdaf.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 12 Mar 2009 13:14:19 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"kosaki.motohiro@...fujitsu.com" <kosaki.motohiro@...fujitsu.com>
Subject: Re: [RFC][PATCH 2/5] add softlimit to res_counter

On Thu, 12 Mar 2009 09:40:38 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> Correct me if I am wrong, but this boils down to checking if the top
> root is above it's soft limit? 

  Level_1    soft limit=400M
    Level_2  soft limit=200M
      Level_3  no soft limit
      Level_3  softlimit=100M
    Level_2  soft limit=200M
    Level_2  soft limit=200M

When checking Level3, we need to check Level_2 and Level_1.


> Instead of checking all the way up in
> the hierarchy, can't we do a conditional check for
> 
>         c->parent == NULL && (c->softlimit < c->usage)
> 
> BTW, I would prefer to split the word softlimit to soft_limit, it is
> more readable that way.
> 
Ok, it will give me tons of HUNK but will do ;)

Thanks,
-Kame

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