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Date: Wed, 26 Feb 2014 19:55:13 +0100
From: Andi Kleen <andi@firstfloor.org>
To: Andy Lutomirski <luto@amacapital.net>
Cc: Stephane Eranian <eranian@google.com>,
        "Yan, Zheng" <zheng.z.yan@intel.com>,
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        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Ingo Molnar <mingo@kernel.org>,
        Arnaldo Carvalho de Melo <acme@infradead.org>,
        Andi Kleen <andi@firstfloor.org>
Subject: Re: [PATCH v3 00/14] perf, x86: Haswell LBR call stack support
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> 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