linux-kernel - Re: [PATCH v3 00/14] perf, x86: Haswell LBR call stack support

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Message-ID: <20140226185513.GL22728@two.firstfloor.org>
Date:	Wed, 26 Feb 2014 19:55:13 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Stephane Eranian <eranian@...gle.com>,
	"Yan, Zheng" <zheng.z.yan@...el.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH v3 00/14] perf, x86: Haswell LBR call stack support

> I'm suggesting a perf event option, just like the way that PEBS works.

Right now it's a somewhat experimental feature and just having 
the sysctl is fine. If it turns out that is what everyone uses
such an option could be still added later.

I suspect most people would still use FP if they can, just use
the LBRs if that doesn't work.

-Andi
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