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Date: Tue, 08 Jun 2010 17:18:39 +0800 From: Lin Ming <ming.m.lin@...el.com> To: Peter Zijlstra <peterz@...radead.org> Cc: Cyrill Gorcunov <gorcunov@...nvz.org>, Ingo Molnar <mingo@...e.hu>, Robert Richter <robert.richter@....com>, LKML <linux-kernel@...r.kernel.org>, Arnaldo Carvalho de Melo <acme@...hat.com>, Frédéric Weisbecker <fweisbec@...il.com> Subject: Re: [PATCH -tip] perf, x86: Make a second write to performance counter if needed On Mon, 2010-06-07 at 17:48 +0800, Peter Zijlstra wrote: > On Thu, 2010-06-03 at 01:23 +0400, Cyrill Gorcunov wrote: > > On Netburst PMU we need a second write to a performance counter > > due to cpu erratum. > > > > A simple flag test instead of alternative instructions was choosen > > because wrmsrl is already a macro and if virtualization is turned > > on will need an additional wrapper call which is more expencise. > > > > nb: we should propably switch to jump-labels as only this facility > > reach the mainline. > > OK. Thanks Cyrill. I tested this patch and it works well for pre-defined events. 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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