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Date: Tue, 22 Jun 2010 09:55:05 +0200 From: Peter Zijlstra <peterz@...radead.org> To: "Zhang, Yanmin" <yanmin_zhang@...ux.intel.com> Cc: Jes Sorensen <Jes.Sorensen@...hat.com>, Avi Kivity <avi@...hat.com>, LKML <linux-kernel@...r.kernel.org>, kvm@...r.kernel.org, Ingo Molnar <mingo@...e.hu>, Fr??d??ric Weisbecker <fweisbec@...il.com>, Arnaldo Carvalho de Melo <acme@...hat.com>, Cyrill Gorcunov <gorcunov@...il.com>, Lin Ming <ming.m.lin@...el.com>, Sheng Yang <sheng@...ux.intel.com>, Marcelo Tosatti <mtosatti@...hat.com>, oerg Roedel <joro@...tes.org>, Gleb Natapov <gleb@...hat.com>, Zachary Amsden <zamsden@...hat.com>, zhiteng.huang@...el.com, tim.c.chen@...el.com Subject: Re: [PATCH V2 1/5] ara virt interface of perf to support kvm guest os statistics collection in guest os On Tue, 2010-06-22 at 15:47 +0800, Zhang, Yanmin wrote: > Besides the para virt perf interface, I'm also considering the direct exposition > of PMU hardware to guest os. NAK NAK NAK NAK, we've been over that, its not going to happen, full stop! Use MSR read/write traps and host perf to emulate the hardware. In some cases we could allow the reads without trap but that's a later optimization. -- 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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