linux-kernel - Re: [RFC][PATCH 0/6] perf: x86 RDPMC and RDTSC support

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Message-ID: <4EDE8EBD.2070104@fb.com>
Date:	Tue, 6 Dec 2011 13:53:01 -0800
From:	Arun Sharma <asharma@...com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Stephane Eranian <eranian@...gle.com>, <mingo@...e.hu>,
	William Cohen <wcohen@...hat.com>,
	Vince Weaver <vince@...ter.net>, <linux-kernel@...r.kernel.org>
Subject: Re: [RFC][PATCH 0/6] perf: x86 RDPMC and RDTSC support

On 12/6/11 1:42 AM, Peter Zijlstra wrote:
> On Mon, 2011-12-05 at 15:17 -0800, Arun Sharma wrote:
>>
>> I suspect that some optimizations are possible in perf_rotate_context
>> that don't involve enabling/disabling the PMU via an IPI for simple
>> cases that involve one or two hardware events (eg: fixed counters).
>
> I've got a patch queued that does exactly that.

Verified that this fixes the lat_ctx regression. Thanks.

  -Arun

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