linux-kernel - Re: [PATCH] oom: add tracepoints for oom_score

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Date:	Tue, 6 Dec 2011 17:22:12 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	dchinner@...hat.com
Subject: Re: [PATCH] oom: add tracepoints for oom_score_adj

On Wed, 7 Dec 2011, KAMEZAWA Hiroyuki wrote:

> From 28189e4622fd97324893a0b234183f64472a54d6 Mon Sep 17 00:00:00 2001
> From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Date: Wed, 7 Dec 2011 09:58:16 +0900
> Subject: [PATCH] oom: trace point for oom_score_adj
> 
> oom_score_adj is set to prevent a task from being killed by OOM-Killer.
> Some daemons sets this value and their children inerit it sometimes.
> Because inheritance of oom_score_adj is done automatically, users
> can be confused at seeing the value and finds it's hard to debug.
> 
> This patch adds trace point for oom_score_adj. This adds 3 trace
> points. at
> 	- update oom_score_adj
> 	- fork()
> 	- rename task->comm(typically, exec())
> 
> Outputs will be following.
>    bash-2404  [006]   199.620841: oom_score_adj_update: task 2404[bash] updates oom_score_ad  j=-1000
>    bash-2404  [006]   205.861287: oom_score_adj_inherited: new_task=2442 oom_score_adj=-1000
>    su-2442  [003]   205.861761: oom_score_task_rename: rename task 2442[bash] to [su] oom_  score_adj=-1000
>    su-2442  [003]   205.866737: oom_score_adj_inherited: new_task=2444 oom_score_adj=-1000
>    bash-2444  [007]   205.868136: oom_score_task_rename: rename task 2444[su] to [bash] oom_  score_adj=-1000
>    bash-2444  [007]   205.870407: oom_score_adj_inherited: new_task=2445 oom_score_adj=-1000
>    bash-2445  [001]   205.870975: oom_score_adj_inherited: new_task=2446 oom_score_adj=-1000
> 

Little bit of whitespace damage there, but looks good in the code itself.

> Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

Just minor alterations to the format of the tracepoints from the first 
version, so carry over my

Acked-by: David Rientjes <rientjes@...gle.com>
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