linux-kernel - Re: [PATCH] oom_adj/oom

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Message-Id: <20060801093224.bb3736fe.rdunlap@xenotime.net>
Date:	Tue, 1 Aug 2006 09:32:24 -0700
From:	"Randy.Dunlap" <rdunlap@...otime.net>
To:	Jan-Frode Myklebust <mykleb@...ibm.com>
Cc:	akpm@...l.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] oom_adj/oom_score documentation

On Tue, 1 Aug 2006 16:13:08 +0200 Jan-Frode Myklebust wrote:

> I was looking for the a way around an OOM-problem, and found
> a couple of undocumented new features for tuning the OOM-score
> of individual processes. Here's a small documentation patch for
> /proc/<pid>/oom_adj and /proc/<pid>/oom_score.

Thanks, it's needed.

A few comments below.


> Signed-off-by: Jan-Frode Myklebust <mykleb@...ibm.com>
> 
> ---
> 
> diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
> index 99902ae..81bb8ea 100644
> --- a/Documentation/filesystems/proc.txt
> +++ b/Documentation/filesystems/proc.txt
> @@ -39,6 +39,8 @@ Table of Contents
>    2.9	Appletalk
>    2.10	IPX
>    2.11	/proc/sys/fs/mqueue - POSIX message queues filesystem
> +  2.12	/proc/<pid>/oom_adj - Adjust the oom-killer score
> +  2.13	/proc/<pid>/oom_score - Display current oom-killer score
>  
>  ------------------------------------------------------------------------------
>  Preface
> @@ -1958,6 +1960,21 @@ a queue must be less or equal then msg_m
>  maximum  message size value (it is every  message queue's attribute set during
>  its creation).
>  
> +2.12 /proc/<pid>/oom_adj - Adjust the oom-killer score
> +------------------------------------------------------
> +
> +This file can be used to adjust the score used to select which processes shall
> +be killed in an out-of-memory situation.  Giving it a high score, increase the

Drop the comma.  "increases"

> +likelihood of this process being killed by the oom-killer. Valid values are in
> +the range [-16:15], plus the special value '-17', which defeat the  oom-killer

"defeats"

> +altogether.
> +
> +2.13 /proc/<pid>/oom_score - Display current oom-killer score
> +-------------------------------------------------------------
> +
> +This file can be used to check what the  current score  used by the oom-killer
> +is for any given <pid>. Use it together with /proc/<pid>/oom_adj to tune which
> +process will be killed in an out-of-memory situation.
>  
>  ------------------------------------------------------------------------------
>  Summary


---
~Randy
-
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