linux-kernel - Re: [PATCH] sysrq show-all-cpus

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Date:	Mon, 10 Mar 2008 11:09:09 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Rik van Riel <riel@...hat.com>
CC:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	lwoodman@...hat.com
Subject: Re: [PATCH] sysrq show-all-cpus

Rik van Riel wrote:
> SysRQ-P is not always useful on SMP systems, since it usually ends up showing the
> backtrace of a CPU that is doing just fine, instead of the backtrace of the CPU
> that is having problems.
> 
> This patch adds SysRQ show-all-cpus(L), which shows the backtrace of every active
> CPU in the system.  It skips idle CPUs because some SMP systems are just too large
> and we already know what the backtrace of the idle task looks like.
>  
> Signed-off-by: Rik van Riel <riel@...hat.com>
> 
> diff -up linux-2.6.25-rc3-mm1/Documentation/sysrq.txt.multicpu linux-2.6.25-rc3-mm1/Documentation/sysrq.txt
> --- linux-2.6.25-rc3-mm1/Documentation/sysrq.txt.multicpu	2008-03-10 13:49:18.000000000 -0400
> +++ linux-2.6.25-rc3-mm1/Documentation/sysrq.txt	2008-03-10 13:51:09.000000000 -0400
> @@ -85,6 +85,8 @@ On all -  write a character to /proc/sys
>  'k'     - Secure Access Key (SAK) Kills all programs on the current virtual
>            console. NOTE: See important comments below in SAK section.
>  
> +'l'     - Shows a stack backtrace for all active CPUs.
> +
>  'm'     - Will dump current memory info to your console.
>  
>  'n'	- Used to make RT tasks nice-able

Yep, thanks.
A diffstat is also appreciated (in the future).

-- 
~Randy
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