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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <87bpe7qnrg.fsf@basil.nowhere.org>
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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/