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Date: Wed, 26 Feb 2014 12:19:35 -0700
From: David Ahern <dsahern@gmail.com>
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To: Andy Lutomirski <luto@amacapital.net>, Andi Kleen <andi@firstfloor.org>
CC: Stephane Eranian <eranian@google.com>,
        "Yan, Zheng" <zheng.z.yan@intel.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Ingo Molnar <mingo@kernel.org>,
        Arnaldo Carvalho de Melo <acme@infradead.org>
Subject: Re: [PATCH v3 00/14] perf, x86: Haswell LBR call stack support
References: <1392703661-15104-1-git-send-email-zheng.z.yan@intel.com> <530D53EF.9090706@amacapital.net> <CABPqkBSECV6iG4T60-OTZsV2CrCtV=awUSt7SGLTdkX9i8T90g@mail.gmail.com> <CALCETrWXDYsxXBWPqNS8cK69756DNj5sUyk-Fho2r_5_wh-=mg@mail.gmail.com> <20140226185513.GL22728@two.firstfloor.org> <CALCETrVQ8SBg+YLuPmDevL+f2dzBjLJucfMvVHaB04E8QJSGXw@mail.gmail.com>
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On 2/26/14, 11:59 AM, Andy Lutomirski wrote:

> I wonder if anyone who uses perf for userspace profiling *ever* uses
> FP and gets away with it.  There's precious little userspace software
> compiled with frame pointers these days on most architectures.

yes and yes. With control over the entire stack we are making sure 
frame-pointers are enabled as much as possible.

David