[PATCH 0/8] Add support for remote unwind

[He Kuang]

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.

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