Messages in this thread | | | Subject | Re: [PATCH -tip] perf, x86: Make a second write to performance counter if needed | From | Lin Ming <> | Date | Tue, 08 Jun 2010 17:18:39 +0800 |
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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
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