Messages in this thread | | | Subject | Re: [PATCH 0/2] perf: Use LBR for machine/oops debugging | From | Peter Zijlstra <> | Date | Mon, 29 Mar 2010 16:14:19 +0200 |
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On Mon, 2010-03-29 at 15:08 +0200, Andi Kleen wrote: > 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.
We do an lbr_off() in oops_begin(), or is there a better/earlier place we can do that?
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