linux-kernel - Re: [PATCH 0/2] perf: Use LBR for machine/oops debugging

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Date:	Mon, 29 Mar 2010 15:08:03 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	mingo@...e.hu, Linus Torvalds <torvalds@...l.org>,
	linux-kernel@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 0/2] perf: Use LBR for machine/oops debugging

Peter Zijlstra <a.p.zijlstra@...llo.nl> writes:

> The LBRs are relatively cheap to keep enabled and provide some history
> to OOPSen, also some CPUs are reported to keep them over soft-reset,
> which allows us to use them to debug things like tripple faults.
>
> Therefore introduce a boot option: lbr_debug=on, which always enable
> the LBRs and will print the LBRs on CPU init and die().


die is too late. they will only contain the oops code then.

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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