linux-kernel - Re: [PATCH] perf report: fix off-by-one for non-activation frames

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Message-ID: <12254594.nNfBy6txoy@milian-kdab2>
Date:   Mon, 15 May 2017 17:13:06 +0200
From:   Milian Wolff <milian.wolff@...b.com>
To:     Milian Wolff <milian.wolff@...b.com>
Cc:     Linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        Milian Wolff <milian.wolff@...b.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        David Ahern <dsahern@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Yao Jin <yao.jin@...ux.intel.com>
Subject: Re: [PATCH] perf report: fix off-by-one for non-activation frames

On Monday, May 15, 2017 5:04:44 PM CEST Milian Wolff wrote:
> As the documentation for dwfl_frame_pc says, frames that
> are no activation frames need to have their program counter
> decremented by one to properly find the function of the caller.

Note that this leaves the perf build against libunwind in the current, broken 
state. I do not know how to detect the activation property there. Does anyone 
else? See elfutils source code for what it is doing:

https://sourceware.org/git/?p=elfutils.git;a=blob;f=libdwfl/
dwfl_frame_pc.c;h=296c815b9c73f42d79ac1778d2a0c420b89ee4eb;hb=HEAD

Cheers
-- 
Milian Wolff | milian.wolff@...b.com | Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt Experts
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