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

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Message-ID: <20080311100750.01464a5c@bree.surriel.com>
Date:	Tue, 11 Mar 2008 10:07:50 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Jon Masters <jonathan@...masters.org>
Cc:	Randy Dunlap <randy.dunlap@...cle.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, lwoodman@...hat.com
Subject: Re: [PATCH] sysrq show-all-cpus

On Tue, 11 Mar 2008 03:18:24 -0400
Jon Masters <jonathan@...masters.org> wrote:

> On Mon, 2008-03-10 at 14:03 -0400, 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>
> 
> Why not have it just print the local CPU on non-SMP anyway?

Sysrq p already does exactly that.

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