From: Milian Wolff <milian.wolff@kdab.com>
To: Milian Wolff <milian.wolff@kdab.com>
Cc: Linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Milian Wolff <milian.wolff@kdab.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
David Ahern <dsahern@gmail.com>,
Namhyung Kim <namhyung@kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Yao Jin <yao.jin@linux.intel.com>
Subject: Re: [PATCH] perf report: fix off-by-one for non-activation frames
Date: Mon, 15 May 2017 17:13:06 +0200 [thread overview]
Message-ID: <12254594.nNfBy6txoy@milian-kdab2> (raw)
In-Reply-To: <20170515150444.6841-1-milian.wolff@kdab.com>
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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@kdab.com | Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt Experts
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WARNING: multiple messages have this Message-ID (diff)
From: Milian Wolff <milian.wolff@kdab.com>
Cc: Linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
Milian Wolff <milian.wolff@kdab.com>,
Arnaldo Carvalho de Melo <acme@redhat.com>,
David Ahern <dsahern@gmail.com>,
Namhyung Kim <namhyung@kernel.org>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Yao Jin <yao.jin@linux.intel.com>
Subject: Re: [PATCH] perf report: fix off-by-one for non-activation frames
Date: Mon, 15 May 2017 17:13:06 +0200 [thread overview]
Message-ID: <12254594.nNfBy6txoy@milian-kdab2> (raw)
In-Reply-To: <20170515150444.6841-1-milian.wolff@kdab.com>
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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@kdab.com | Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt Experts
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next prev parent reply other threads:[~2017-05-15 15:13 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-15 15:04 [PATCH] perf report: fix off-by-one for non-activation frames Milian Wolff
2017-05-15 15:13 ` Milian Wolff [this message]
2017-05-15 15:13 ` Milian Wolff
2017-05-16 1:57 ` Namhyung Kim
2017-05-16 9:00 ` Milian Wolff
2017-06-16 6:14 ` Jan Kratochvil
2017-06-16 11:51 ` Milian Wolff
2017-06-16 11:57 ` Jan Kratochvil
2017-06-16 19:54 ` Milian Wolff
2017-06-17 7:56 ` Namhyung Kim
2017-06-17 8:04 ` Jan Kratochvil
2017-06-17 11:13 ` Milian Wolff
2017-06-19 18:59 ` Arnaldo Carvalho de Melo
2017-07-04 7:59 ` Milian Wolff
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