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Message-ID: <20160506115815.GW11069@kernel.org>
Date: Fri, 6 May 2016 08:58:15 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: He Kuang <hekuang@...wei.com>, Jiri Olsa <jolsa@...nel.org>
Cc: peterz@...radead.org, Ingo Molnar <mingo@...nel.org>,
alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
wangnan0@...wei.com, jpoimboe@...hat.com, ak@...ux.intel.com,
eranian@...gle.com, namhyung@...nel.org, adrian.hunter@...el.com,
sukadev@...ux.vnet.ibm.com, masami.hiramatsu.pt@...achi.com,
tumanova@...ux.vnet.ibm.com, kan.liang@...el.com,
penberg@...nel.org, dsahern@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/8] Add support for remote unwind
Em Fri, May 06, 2016 at 08:59:06AM +0000, He Kuang escreveu:
> Currently, perf script uses host unwind methods to parse perf.data
> callchain info regardless of the target architecture. So we get wrong
> result and no promotion when do remote unwind on other
> platforms/machines.
Thanks for working on this, being able to record on one machine and do
analysis in another, of a different hw architectures is indeed a goal
for the perf tools!
Jiri, if you could please take a look, that would be really great!
- Arnaldo
> This patch set adds build tests for the supported platforms for remote
> unwinding, and checks the map elf info for each thread, use remote
> unwind methods instead.
>
> Only x86 and aarch64 is added in this patch set to show the work flow,
> other platforms can be added easily.
>
> We can see the right result for unwind infos on different machines,
> for example: we record perf.data on i686 qemu with '-g' option and
> parse it on x86_64 machine.
>
> before this patchset:
>
> hello 1071 [000] 417.567832: probe:sys_close: (c1169d60)
> c1169d61 sys_close ([kernel.kallsyms])
> c189c0d7 sysenter_past_esp ([kernel.kallsyms])
> b77c8ba9 [unknown] ([vdso32])
>
> after:
>
> hello 1071 [000] 417.567832: probe:sys_close: (c1169d60)
> c1169d61 sys_close ([kernel.kallsyms])
> c189c0d7 sysenter_past_esp ([kernel.kallsyms])
> b77c8ba9 [unknown] ([vdso32])
> b76e51cc close (/lib/libc-2.22.so)
> 804842e fib (/tmp/hello)
> 804849d main (/tmp/hello)
> b762546e __libc_start_main (/lib/libc-2.22.so)
> 8048341 _start (/tmp/hello)
>
> Thanks, discussion welcomed.
>
> He Kuang (8):
> perf tools: Omit DWARF judgement when recording dwarf callchain
> perf script: Add options for custom vdso name
> perf build: Add build-test for libunwind cross-platforms support
> perf build: Add build-test for debug-frame on arm/arm64
> perf tools: Promote proper messages for cross-platform unwind
> perf callchain: Add support for cross-platform unwind
> perf callchain: Support x86 target platform
> perf callchain: Support aarch64 cross-platform
>
> tools/build/Makefile.feature | 11 +++-
> tools/build/feature/Makefile | 26 +++++++-
> tools/build/feature/test-libunwind-aarch64.c | 26 ++++++++
> tools/build/feature/test-libunwind-arm.c | 27 +++++++++
> .../feature/test-libunwind-debug-frame-aarch64.c | 16 +++++
> .../build/feature/test-libunwind-debug-frame-arm.c | 16 +++++
> tools/build/feature/test-libunwind-debug-frame.c | 16 -----
> tools/build/feature/test-libunwind-x86.c | 27 +++++++++
> tools/build/feature/test-libunwind-x86_64.c | 27 +++++++++
> .../arch/arm64/include/libunwind/libunwind-arch.h | 18 ++++++
> tools/perf/arch/arm64/util/unwind-libunwind.c | 5 +-
> .../arch/x86/include/libunwind/libunwind-arch.h | 18 ++++++
> tools/perf/arch/x86/util/unwind-libunwind.c | 42 +++++++++++++
> tools/perf/builtin-script.c | 2 +
> tools/perf/config/Makefile | 35 ++++++++++-
> tools/perf/util/Build | 13 +++-
> tools/perf/util/dso.c | 7 +++
> tools/perf/util/dso.h | 1 +
> tools/perf/util/symbol-elf.c | 16 +++++
> tools/perf/util/symbol.c | 50 ++++++++++++++++
> tools/perf/util/symbol.h | 3 +
> tools/perf/util/thread.c | 70 ++++++++++++++++++++--
> tools/perf/util/thread.h | 14 ++++-
> tools/perf/util/unwind-libunwind.c | 50 +++++++++++++---
> tools/perf/util/unwind-libunwind_common.c | 60 +++++++++++++++++++
> tools/perf/util/unwind.h | 30 ++++++++++
> tools/perf/util/util.c | 2 -
> 27 files changed, 589 insertions(+), 39 deletions(-)
> create mode 100644 tools/build/feature/test-libunwind-aarch64.c
> create mode 100644 tools/build/feature/test-libunwind-arm.c
> create mode 100644 tools/build/feature/test-libunwind-debug-frame-aarch64.c
> create mode 100644 tools/build/feature/test-libunwind-debug-frame-arm.c
> delete mode 100644 tools/build/feature/test-libunwind-debug-frame.c
> create mode 100644 tools/build/feature/test-libunwind-x86.c
> create mode 100644 tools/build/feature/test-libunwind-x86_64.c
> create mode 100644 tools/perf/arch/arm64/include/libunwind/libunwind-arch.h
> create mode 100644 tools/perf/arch/x86/include/libunwind/libunwind-arch.h
> create mode 100644 tools/perf/util/unwind-libunwind_common.c
>
> --
> 1.8.5.2
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