[PATCH v2 0/9] Add support for remote unwind

[He Kuang]

v1 url:
   http://thread.gmane.org/gmane.linux.kernel/2216256

Currently, perf script uses host unwind methods(local unwind) 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.

This patchset adds build tests for the supported platforms for remote
unwinding, and checks whether a dso is 32-bit or 64-bit according to
elf class info for each thread to let perf use the correct remote
unwind methods instead.

Only x86 and aarch64 is added in this patchset to show the work flow,
other platforms can be added easily.

We can see the right result for unwind info on different machines, for
example: perf.data recorded on i686 qemu with '-g' option and parsed
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)

v2:

 - Explain the reason why we can omit dwarf judgement when recording
   in commit message.
 - Elaborate on why we need to add a custom vdso path option, and
   change the type name to DSO_BINARY_TYPE__VDSO.
 - Hide the build tests status for cross platform unwind.
 - Keep generic version of libunwind-debug-frame test.
 - Put 32/64-bit test functions into separate patch.
 - Extract unwind related functions to unwind-libunwind.c and add new
   file for common parts used by both local and remote unwind.
 - Eliminate most of the ifdefs in .c file.

Thanks.

He Kuang (9):
  perf tools: Omit DWARF judgement when recording dwarf callchain
  perf script: Add options for custom vdso path
  perf build: Add build-test for libunwind cross-platforms support
  perf build: Add build-test for debug-frame on arm/arm64
  perf tools: Add methods to test dso is 64-bit or 32-bit
  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                       |   8 +-
 tools/build/feature/Makefile                       |  23 +++++
 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-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                           |   7 +-
 tools/perf/util/thread.h                           |  14 ++-
 tools/perf/util/unwind-libunwind.c                 |  49 +++++++--
 tools/perf/util/unwind-libunwind_common.c          | 113 +++++++++++++++++++++
 tools/perf/util/unwind.h                           |  48 +++++++--
 tools/perf/util/util.c                             |   2 -
 26 files changed, 585 insertions(+), 28 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
 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

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1.8.5.2