Messages in this thread | | | Date | Mon, 29 Mar 2010 14:16:23 +0100 | Subject | Re: [PATCH 0/2] perf: Use LBR for machine/oops debugging | From | Stephane Eranian <> |
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On Mon, Mar 29, 2010 at 2:08 PM, Andi Kleen <andi@firstfloor.org> 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. > Most likely yes, especially with small LBR, such as on Intel Core.
> -Andi > > -- > ak@linux.intel.com -- Speaking for myself only. >
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