linux-kernel - Re: [PATCH] perf, x86: Optimize intel_pmu_pebs_fixup

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Message-ID: <20131025170306.GF19466@laptop.lan>
Date:	Fri, 25 Oct 2013 19:03:06 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Don Zickus <dzickus@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <ak@...ux.intel.com>, dave.hansen@...ux.intel.com,
	Stephane Eranian <eranian@...gle.com>, jmario@...hat.com,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH] perf, x86: Optimize intel_pmu_pebs_fixup_ip()

On Fri, Oct 25, 2013 at 12:33:03PM -0400, Don Zickus wrote:
> Hi Peter,
> 
> I finally had a chance to run this on my machine.  From my testing, it
> looks good.  Better performance numbers.  I think my longest latency went
> from 300K cycles down to 150K cycles and very few of those (most are under
> 100K cycles).
> 
> I also don't see perf throttling me down to 1500 samples, it stops around
> 7000.  So I see progress with this patch. :-)

Awesome.. I'll write up a proper patch when I'm back home.
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