From: Peter Zijlstra <peterz@infradead.org>
To: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: "Ingo Molnar" <mingo@elte.hu>,
"Robert Richter" <robert.richter@amd.com>,
LKML <linux-kernel@vger.kernel.org>,
"Lin Ming" <ming.m.lin@intel.com>,
"Arnaldo Carvalho de Melo" <acme@redhat.com>,
"Frédéric Weisbecker" <fweisbec@gmail.com>
Subject: Re: [PATCH -tip] perf, x86: Make a second write to performance counter if needed
Date: Mon, 07 Jun 2010 11:48:05 +0200 [thread overview]
Message-ID: <1275904085.1645.555.camel@laptop> (raw)
In-Reply-To: <20100602212304.GC5264@lenovo>
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.
next prev parent reply other threads:[~2010-06-07 9:48 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-02 21:23 [PATCH -tip] perf, x86: Make a second write to performance counter if needed Cyrill Gorcunov
2010-06-07 9:48 ` Peter Zijlstra [this message]
2010-06-08 9:18 ` Lin Ming
2010-06-09 10:16 ` [tip:perf/core] " tip-bot for Cyrill Gorcunov
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