linux-kernel - Re: additional oom-killer tuneable worth submitting?

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Message-Id: <1165519292.14110.2.camel@lappy>
Date:	Thu, 07 Dec 2006 20:21:32 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Chris Friesen <cfriesen@...tel.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: additional oom-killer tuneable worth submitting?

On Thu, 2006-12-07 at 12:30 -0600, Chris Friesen wrote:
> The kernel currently has a way to adjust the oom-killer score via 
> /proc/<pid>/oomadj.
> 
> However, to adjust this effectively requires knowledge of the scores of 
> all the other processes on the system.
> 
> I'd like to float an idea (which we've implemented and been using for 
> some time) where the semantics are slightly different:
> 
> We add a new "oom_thresh" member to the task struct.
> We introduce a new proc entry "/proc/<pid>/oomthresh" to control it.
> 
> The "oom-thresh" value maps to the max expected memory consumption for 
> that process.  As long as a process uses less memory than the specified 
> threshold, then it is immune to the oom-killer.

You would need to specify the measure of memory used by your process;
see the (still not resolved) RSS debate.

> On an embedded platform this allows the designer to engineer the system 
> and protect critical apps based on their expected memory consumption. 
> If one of those apps goes crazy and starts chewing additional memory 
> then it becomes vulnerable to the oom killer while the other apps remain 
> protected.
> 
> If a patch for the above feature was submitted, would there be any 
> chance of getting it included?  Maybe controlled by a config option?


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