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Message-ID: <4A369F3F.5060600@redhat.com> Date: Mon, 15 Jun 2009 22:21:35 +0300 From: Avi Kivity <avi@...hat.com> To: Peter Zijlstra <a.p.zijlstra@...llo.nl> CC: Ingo Molnar <mingo@...e.hu>, Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>, "H. Peter Anvin" <hpa@...or.com>, Linus Torvalds <torvalds@...ux-foundation.org>, mingo@...hat.com, paulus@...ba.org, acme@...hat.com, linux-kernel@...r.kernel.org, penberg@...helsinki.fi, vegard.nossum@...il.com, efault@....de, jeremy@...p.org, npiggin@...e.de, tglx@...utronix.de, linux-tip-commits@...r.kernel.org Subject: Re: [tip:perfcounters/core] perf_counter: x86: Fix call-chain support to use NMI-safe methods On 06/15/2009 10:10 PM, Peter Zijlstra wrote: >> But one thing is sure: it is certainly going to be faster than the >> INVLPG(s!) we have to do with the GUP solution. >> > > Sure, but we only pay that price when we do the callchain bit, not on > every NMI. > You can read cr2 on nmi entry and nmi exit, and only write it if it has changed (if it turns out that writing cr2 is expensive; ISTR that it isn't). -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain. -- 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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