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

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Date:	Fri, 27 Mar 2015 13:09:53 +0000
From:	"Liang, Kan" <kan.liang@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	"eranian@...gle.com" <eranian@...gle.com>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"linux-kernel@...r.kernel.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?

Yes, all shared regs can also be moved ahead.
The patch is named for modifying the branch filter. I didn't want to change 
other codes. So I keep them unchanged.  
I will do it in next version.

> 
> > 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.
Will remove the description, since it doesn't need in next version.

Thanks,
Kan
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