linux-kernel - Re: [PATCH v5 1/1] powerpc/perf: Adjust callchain based on DWARF debug info

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Message-ID: <20140922213345.GB666@drone.musicnaut.iki.fi>
Date:	Tue, 23 Sep 2014 00:33:45 +0300
From:	Aaro Koskinen <aaro.koskinen@....fi>
To:	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>
Cc:	Jiri Olsa <jolsa@...hat.com>,
	Michael Ellerman <michaele@....ibm.com>,
	linuxppc-dev@...abs.org, Anton Blanchard <anton@....ibm.com>,
	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	ulrich.weigand@...ibm.com, Maynard Johnson <mpjohn@...ibm.com>
Subject: Re: [PATCH v5 1/1] powerpc/perf: Adjust callchain based on DWARF
 debug info

Hi,

On Wed, Jun 25, 2014 at 08:49:03AM -0700, Sukadev Bhattiprolu wrote:
> powerpc/perf: Adjust callchain based on DWARF debug info
> 
> When saving the callchain on Power, the kernel conservatively saves excess
> entries in the callchain. A few of these entries are needed in some cases
> but not others. We should use the DWARF debug information to determine
> when the entries are  needed.

This patch breaks perf compilation if DWARF support is not present.
DWARF support is auto-detected early in the build, so IMHO either user
should be informed to install the needed stuff, or the build should
succeed with limited functionality.

arch/powerpc/util/skip-callchain-idx.c:13:19: fatal error: dwarf.h: No such file or directory #include <dwarf.h>
                   ^
compilation terminated.

A.
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