linux-kernel - Re: [PATCH] perf, tools: Disable branch flags/cycles for --callgraph lbr

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Message-ID: <20151214151249.GG6843@kernel.org>
Date:	Mon, 14 Dec 2015 12:12:49 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Andi Kleen <andi@...stfloor.org>, jolsa@...nel.org,
	mingo@...nel.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf, tools: Disable branch flags/cycles for --callgraph
 lbr

Em Mon, Dec 14, 2015 at 10:55:38AM +0100, Jiri Olsa escreveu:
> On Fri, Dec 11, 2015 at 04:12:24PM -0800, Andi Kleen wrote:
> > From: Andi Kleen <ak@...ux.intel.com>
> > 
> > [The kernel patch needed for this is in tip now
> > (b16a5b52eb9 perf/x86: Add option to disable ...)
> > So this user tools patch to make use of it should be merged now]
> > 
> > Automatically disable collecting branch flags and cycles with
> > --call-graph lbr. This allows avoiding a bunch of extra MSR
> > reads in the PMI on Skylake.
> > 
> > When the kernel doesn't support the new flags they are automatically
> > cleared in the fallback code.
> > 
> > v2: Switch to use branch_sample_type instead of sample_type.
> > Adjust description.
> > Fix the fallback logic.
> > Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> 
> Acked-by: Jiri Olsa <jolsa@...nel.org>

Thanks, applied to perf/core.

- Arnaldo
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