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

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Date:	Tue, 17 Dec 2013 12:08:56 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Will Deacon <will.deacon@....com>
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


* Will Deacon <will.deacon@....com> wrote:

> 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...

Sure :-)

Thanks,

	Ingo
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