linux-kernel - Re: [PATCH V4 10/16] perf, core: simplify need branch stack check

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Message-ID: <20140702132856.GF19379@twins.programming.kicks-ass.net>
Date:	Wed, 2 Jul 2014 15:28:56 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	"Yan, Zheng" <zheng.z.yan@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH V4 10/16] perf, core: simplify need branch stack check

On Wed, Jul 02, 2014 at 03:00:52PM +0200, Stephane Eranian wrote:
> He is probably talking about precise=2 for non HSW PMU.
> But it is true,  you need to look at x86_pmu_hw_config()
>  *br_type = PERF_SAMPLE_BRANCH_ANY;

Ah! indeed. And that is why I didn't find it, I was looking:
"branch_sample_type[[:space:]]*=" and we've obscured it with that
br_type thing.

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