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From: Randy Dunlap <randy.dunlap@oracle.com>
To: Rik van Riel <riel@redhat.com>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
	lwoodman@redhat.com
Subject: Re: [PATCH] sysrq show-all-cpus
Date: Mon, 10 Mar 2008 11:09:09 -0700	[thread overview]
Message-ID: <47D57945.60204@oracle.com> (raw)
In-Reply-To: <20080310140315.1a451092@bree.surriel.com>

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@redhat.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

  reply	other threads:[~2008-03-10 18:10 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-03-10 17:32 Rik van Riel
2008-03-10 17:41 ` Andrew Morton
2008-03-10 17:57   ` Rik van Riel
2008-03-10 17:46 ` Randy Dunlap
2008-03-10 18:03   ` Rik van Riel
2008-03-10 18:09     ` Randy Dunlap [this message]
2008-03-11  7:18     ` Jon Masters
2008-03-11 14:07       ` Rik van Riel
2008-03-11 15:06         ` Jon Masters
2008-03-11  8:12     ` Nick Piggin

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