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

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Message-Id: <20100329122021.765109681@chello.nl>
Date:	Mon, 29 Mar 2010 14:20:21 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	mingo@...e.hu, Linus Torvalds <torvalds@...l.org>
Cc:	linux-kernel@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: [PATCH 0/2] perf: Use LBR for machine/oops debugging

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().

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