linux-kernel - Re: [PATCH 1/1] perf/x86: filter branches for PEBS event

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Message-ID: <20150327121742.GE23123@twins.programming.kicks-ass.net>
Date:	Fri, 27 Mar 2015 13:17:42 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	kan.liang@...el.com
Cc:	eranian@...gle.com, andi@...stfloor.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] perf/x86: filter branches for PEBS event

On Thu, Mar 26, 2015 at 02:13:23PM -0400, kan.liang@...el.com wrote:
> This patch move intel_shared_regs_constraints for branch_reg ahead of
> intel_pebs_constraints.

Why not all shared regs?

> intel_shared_regs_constraints for branch_reg doesn't modify event->hw,
> so it's safe to be called before intel_pebs_constraints.
> intel_shared_regs_constraints for branch_reg also special case when it
> returns &emptyconstraint. It put constraints for extra_reg. This patch
> remove it. Because it will never get constraints for extra_reg if return
> is &emptyconstraint.

-ENOPARSE.
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