From: Andi Kleen <andi@firstfloor.org>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: mingo@elte.hu, Linus Torvalds <torvalds@osdl.org>,
linux-kernel@vger.kernel.org,
Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH 0/2] perf: Use LBR for machine/oops debugging
Date: Mon, 29 Mar 2010 15:08:03 +0200 [thread overview]
Message-ID: <87bpe7qnrg.fsf@basil.nowhere.org> (raw)
In-Reply-To: <20100329122021.765109681@chello.nl> (Peter Zijlstra's message of "Mon, 29 Mar 2010 14:20:21 +0200")
Peter Zijlstra <a.p.zijlstra@chello.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@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2010-03-29 13:08 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-29 12:20 [PATCH 0/2] perf: Use LBR for machine/oops debugging Peter Zijlstra
2010-03-29 12:20 ` [PATCH 1/2] perf, x86: fix __initconst vs const Peter Zijlstra
2010-03-29 12:20 ` [RFC,PATCH 2/2] perf, x86: Utilize the LBRs for machine/oops debugging Peter Zijlstra
2010-03-29 12:47 ` Stephane Eranian
2010-03-29 14:13 ` Peter Zijlstra
2010-03-29 14:20 ` Stephane Eranian
2010-03-29 17:02 ` Ingo Molnar
2010-03-29 17:12 ` Peter Zijlstra
2010-04-02 20:44 ` Ingo Molnar
2010-03-29 13:08 ` Andi Kleen [this message]
2010-03-29 13:16 ` [PATCH 0/2] perf: Use LBR " Stephane Eranian
2010-03-29 14:14 ` Peter Zijlstra
2010-03-29 20:09 ` Andi Kleen
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