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

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Message-ID: <20140702105737.GC6758@twins.programming.kicks-ass.net>
Date:	Wed, 2 Jul 2014 12:57:37 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Yan, Zheng" <zheng.z.yan@...el.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org, acme@...radead.org,
	eranian@...gle.com, andi@...stfloor.org
Subject: Re: [PATCH V4 10/16] perf, core: simplify need branch stack check

On Mon, Jun 30, 2014 at 04:50:47PM +0800, Yan, Zheng wrote:
> event->attr.branch_sample_type is non-zero no matter branch stack
> is enabled explicitly or is enabled implicitly. we can use it to
> replace intel_pmu_needs_lbr_smpl(). This avoids duplicating code
> that implicitly enables the LBR.

How so? I grep'ed for a minute but could not find what you're referring
to.

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