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Date: Mon, 22 Nov 2010 13:47:59 +0100 From: Stephane Eranian <eranian@...gle.com> To: Lin Ming <lin@...g.vg> Cc: Andi Kleen <andi@...stfloor.org>, a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org, x86@...nel.org, Andi Kleen <ak@...ux.intel.com> Subject: Re: [PATCH 3/4] perf-events: Add support for supplementary event registers v3 On Mon, Nov 22, 2010 at 1:23 PM, Lin Ming <lin@...g.vg> wrote: > On Thu, Nov 18, 2010 at 6:47 PM, Andi Kleen <andi@...stfloor.org> wrote: >> From: Andi Kleen <ak@...ux.intel.com> >> >> Intel Nehalem/Westmere have a special OFFCORE_RESPONSE event >> that can be used to monitor any offcore accesses from a core. >> This is a very useful event for various tunings, and it's >> also needed to implement the generic LLC-* events correctly. >> >> Unfortunately this event requires programming a mask in a separate >> register. And worse this separate register is per core, not per >> CPU thread. > > This "separate register" is MSR_OFFCORE_RSP_0, right? > But from the SDM, MSR_OFFCORE_RSP_0 is "thread" scope, > see SDM 3b, Appendix B.4 MSRS IN THE INTEL® MICROARCHITECTURE CODENAME NEHALEM > > Or am I missing some obvious thing? > The manual is wrong on this. > Thanks, > Lin Ming > -- 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/
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