linux-kernel - Re: [PATCH 0/3] perf: parse the dwarf backtrace info from .debug

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Date:	Tue, 10 Sep 2013 09:29:48 +0200
From:	Jean Pihet <jean.pihet@...aro.org>
To:	Will Deacon <will.deacon@....com>, Jiri Olsa <jolsa@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Cc:	Patch Tracking <patches@...aro.org>,
	Jean Pihet <jean.pihet@...aro.org>
Subject: Re: [PATCH 0/3] perf: parse the dwarf backtrace info from
 .debug_frame section

Hi!

FYI a wiki page has been added for perf-libunwind, at
https://wiki.linaro.org/LEG/Engineering/TOOLS/perf-libunwind

Any feedback is welcome!

Cheers,
Jean

On 9 September 2013 12:00, Jean Pihet <jean.pihet@...aro.org> wrote:
> On ARM the debug info is not present in the .eh_frame sections but
> in .debug_frame instead, in dwarf format.
>
> This patch set uses libunwind to load and parse the dwarf debug info from
> the .debug_frame section if no .eh_frame_hdr section is found; also it
> sets the hooks in the perf_regs and libunwind code for ARMv7.
>
> Dependencies:
>  . if present, libunwind >= 1.1 is needed to prevent a segfault when
>    parsing the dwarf info,
>  . libunwind needs to be configured with --enable-debug-frame
>    to prevent a linkage error. Note: --enable-debug-frame is automatically
>    selected on ARM).
>
> The generated perf has been tested on ARMv7/OMAP4 and x86_64, using the
> following commands:
>  perf record -g [dwarf] -- <binary>
>  perf report --sort symbol --call-graph --stdio
>
>
> Jean Pihet (1):
>   perf: parse the .debug_frame section in case .eh_frame is not present
>
> Will Deacon (2):
>   ARM: perf: add support for perf registers API
>   ARM: perf: wire up perf_regs and unwind support for ARM
>
>  arch/arm/Kconfig                        |  2 +
>  arch/arm/include/uapi/asm/Kbuild        |  1 +
>  arch/arm/include/uapi/asm/perf_regs.h   | 23 +++++++++++
>  arch/arm/kernel/Makefile                |  1 +
>  arch/arm/kernel/perf_regs.c             | 30 ++++++++++++++
>  tools/perf/arch/arm/Makefile            |  3 ++
>  tools/perf/arch/arm/include/perf_regs.h | 54 +++++++++++++++++++++++++
>  tools/perf/arch/arm/util/unwind.c       | 48 ++++++++++++++++++++++
>  tools/perf/config/Makefile              |  9 +++--
>  tools/perf/util/unwind.c                | 71 +++++++++++++++++++++++++--------
>  10 files changed, 223 insertions(+), 19 deletions(-)
>  create mode 100644 arch/arm/include/uapi/asm/perf_regs.h
>  create mode 100644 arch/arm/kernel/perf_regs.c
>  create mode 100644 tools/perf/arch/arm/include/perf_regs.h
>  create mode 100644 tools/perf/arch/arm/util/unwind.c
>
> --
> 1.7.11.7
>
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