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

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Date:	Tue, 11 Mar 2008 11:06:56 -0400
From:	Jon Masters <jonathan@...masters.org>
To:	Rik van Riel <riel@...hat.com>
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, 2008-03-11 at 10:07 -0400, Rik van Riel wrote:
> 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.

That's my point. I understand why there's a new command, because it is
different from 'p', but probably worth doing something on non-SMP too.

Jon.


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