linux-kernel - Re: [PATCH 0/3] ARM64: add perf support

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Message-ID: <20131217110154.GA7602@mudshark.cambridge.arm.com>
Date:	Tue, 17 Dec 2013 11:01:54 +0000
From:	Will Deacon <will.deacon@....com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	"jean.pihet@...aro.org" <jean.pihet@...aro.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linaro-kernel@...ts.linaro.org" <linaro-kernel@...ts.linaro.org>,
	Arnaldo <acme@...stprotocols.net>,
	"patches@...aro.org" <patches@...aro.org>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH 0/3] ARM64: add perf support

On Tue, Dec 17, 2013 at 10:45:34AM +0000, Ingo Molnar wrote:
> * jean.pihet@...aro.org <jean.pihet@...aro.org> wrote:
> > From: Jean Pihet <jean.pihet@...aro.org>
> > 
> > Add perf support for the AARCH64 architecture. This includes the
> > support for:
> > - AARCH64 perf registers definition and hooks,
> > - compat mode registers use, i.e. profiling a 32-bit binary on
> >    a 64-bit system,
> > - unwinding using the dwarf information from the .debug_frame
> >    section of the ELF binary; only in 64-bit mode,
> > - unwinding using the frame pointer information; in 64-bit and
> >    compat modes.
> > 
> > ToDo:
> > - add support for unwinding using the dwarf information in compat
> >    mode. This requires some changes to the libunwind code.
> > 
> > Tested on ARMv7 and ARMv8 platforms. The compat mode has been tested
> > on ARMv8 using statically built 32-bit binaries.
> > 
> > 
> > Jean Pihet (3):
> >   ARM64: perf: add support for perf registers API
> >   ARM64: perf: wire up perf_regs and unwind support
> >   ARM64: perf: add support for frame pointer unwinding in compat mode
> > 
> >  arch/arm64/Kconfig                        |  2 +
> >  arch/arm64/include/asm/ptrace.h           |  1 +
> >  arch/arm64/include/uapi/asm/Kbuild        |  1 +
> >  arch/arm64/include/uapi/asm/perf_regs.h   | 40 ++++++++++++++
> >  arch/arm64/kernel/Makefile                |  1 +
> >  arch/arm64/kernel/perf_event.c            | 75 +++++++++++++++++++++++---
> >  arch/arm64/kernel/perf_regs.c             | 46 ++++++++++++++++
> >  tools/perf/arch/arm64/Makefile            |  7 +++
> >  tools/perf/arch/arm64/include/perf_regs.h | 88 +++++++++++++++++++++++++++++++
> >  tools/perf/arch/arm64/util/dwarf-regs.c   | 81 ++++++++++++++++++++++++++++
> >  tools/perf/arch/arm64/util/unwind.c       | 82 ++++++++++++++++++++++++++++
> >  tools/perf/config/Makefile                |  8 ++-
> >  12 files changed, 423 insertions(+), 9 deletions(-)
> >  create mode 100644 arch/arm64/include/uapi/asm/perf_regs.h
> >  create mode 100644 arch/arm64/kernel/perf_regs.c
> >  create mode 100644 tools/perf/arch/arm64/Makefile
> >  create mode 100644 tools/perf/arch/arm64/include/perf_regs.h
> >  create mode 100644 tools/perf/arch/arm64/util/dwarf-regs.c
> >  create mode 100644 tools/perf/arch/arm64/util/unwind.c
> 
> Arnaldo, AFAICS the main merging complexity will probably be on the 
> perf tooling side, so if you are happy with these bits, mind picking 
> them up into your tree?

Hold your horses! I've got a few review comments on the series...

Will
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