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

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Message-ID: <4EDD26B9.8070007@fb.com>
Date:	Mon, 5 Dec 2011 12:16:57 -0800
From:	Arun Sharma <asharma@...com>
To:	Stephane Eranian <eranian@...gle.com>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, <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 12/2/11 2:22 PM, Stephane Eranian wrote:
> Have you tried with inheritance disabled?
> I don't remember if perf stat has it enabled buy default.

Disabling inheritance using the -i switch as in:

(for i in `seq 1 10`; do numactl --cpunodebind 1 perf stat -i -e 
instructions ./lat_ctx -P1 -s32k 4; done)

shows numbers closer to baseline, since the threads used for 
benchmarking are not counting events.

This suggests that:

jump_label_dec(&perf_task_events);

itself doesn't hurt much.

  -Arun
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