linux-kernel - Re: [git-pull -tip] x86: msr architecture debug code

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Message-ID: <20090305182318.GE7347@alberich.amd.com>
Date:	Thu, 5 Mar 2009 19:23:18 +0100
From:	Andreas Herrmann <andreas.herrmann3@....com>
To:	Jaswinder Singh Rajput <jaswinder@...nel.org>
CC:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [git-pull -tip] x86: msr architecture debug code

On Thu, Mar 05, 2009 at 09:17:37PM +0530, Jaswinder Singh Rajput wrote:
> 
> On Thu, 2009-03-05 at 15:37 +0100, Andreas Herrmann wrote:
> > On Thu, Mar 05, 2009 at 07:42:26PM +0530, Jaswinder Singh Rajput wrote:
> > > On Thu, 2009-03-05 at 14:54 +0100, Andreas Herrmann wrote:
> > > 
> > > > All nice suggestions but why in-kernel?
> > > > 
> > > 
> > > In Kernel Space:
> > > 
> > > We can read/write MSRs and can change the bits and see it effect without
> > > writing any code.
> > 
> > Sorry, I can't (or maybe I don't like to) follow.
> > 
> > (BTW, you don't even need to write C-code. You can use a one-liner in perl
> > or python to seek and read any MSR using /dev/cpu/*/msr.)
> > 
> 
> You are running these commands on shell when every thing is working.
> 
> What you will do if you are not getting the shell and kernel is dumping
> or rebooting before that.

In this case a deep debugfs tree with all the MSR details is not of
use either.


Andreas

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