linux-kernel - Re: [-mm patch] Show memcg information during OOM

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Message-Id: <20090203102157.9f643965.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Tue, 3 Feb 2009 10:21:57 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"nishimura@....nes.nec.co.jp" <nishimura@....nes.nec.co.jp>,
	"lizf@...fujitsu.com" <lizf@...fujitsu.com>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [-mm patch] Show memcg information during OOM

On Mon, 2 Feb 2009 19:38:49 +0530
Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:

> * Balbir Singh <balbir@...ux.vnet.ibm.com> [2009-02-02 18:22:40]:
> 
> > Hi, All,
> > 
> > I found the following patch useful while debugging the memory
> > controller. It adds additional information if memcg invoked the OOM.
> > 
> > Comments, Suggestions?
> >
> 
> 
> Description: Add RSS and swap to OOM output from memcg
> 
> From: Balbir Singh <balbir@...ux.vnet.ibm.com>
> 

> This patch displays memcg values like failcnt, usage and limit
> when an OOM occurs due to memcg.
> 

please use "KB" not bytes in OOM killer information.

And the most important information is dropped..
Even if you show information, the most important information that
"where I am and where we hit limit ?" is not coverred.
Could you consider some way to show full-path ?

  OOM-Killer:
  Task in /memory/xxx/yyy/zzz is killed by
  Limit of /memory/xxxx
  RSS Limit :     Usage:     Failcnt....
  RSS+SWAP Limit: ....



Thanks,
-Kame

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