linux-kernel - Re: stable backport: sched: Fix migration thread runtime bogosity

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Date:	Thu, 11 Oct 2012 04:52:16 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	stable <stable@...r.kernel.org>,
	Ben Hutchings <ben@...adent.org.uk>,
	Mike Galbraith <mgalbraith@...e.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: stable backport: sched: Fix migration thread runtime bogosity

On Wed, Oct 10, 2012 at 03:24:03PM -0400, Steven Rostedt wrote:
> Greg, Ben,
> 
> Can you add this commit to the stable branches. Without it, the
> migration thread's accounting is just totally screwed up:
> 
> By running a simple shell while loop along with a ps loop, top shows:
> 
>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND            
>    17 root      RT   0     0    0    0 S 9999.0  0.0   9:27.50 migration/3    
>    13 root      RT   0     0    0    0 S 128.2  0.0   9:50.23 migration/2       
>  2805 root      20   0  105m 1904 1416 S 13.9  0.1   0:06.69 bash               
>  4090 root      20   0  105m 1904 1416 S  2.0  0.1   0:00.90 bash               
>  2773 root      20   0 85484 3372 2620 S  0.3  0.2   0:00.03 sshd               
> 
> 
> For 3.4, the commit can be directly cherry picked:
> 
> commit 8f6189684eb4e85e6c593cd710693f09c944450a
> Author: Mike Galbraith <mgalbraith@...e.de>
> Date:   Sat Aug 4 05:44:14 2012 +0200
> 
>     sched: Fix migration thread runtime bogosity

Now applied to 3.4-stable queue.

greg k-h
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