Re: [PATCH v2 0/2] perf: arm64: Tools support for Dwarf unwinding through SVE functions

Em Tue, May 17, 2022 at 11:20:01AM +0100, James Clark escreveu:

Changes since v1:

  * Split patchset into kernel side and Perf tool changes

Thanks, now I'll wait for the kernel side to be merged.

- Arnaldo
 

When SVE registers are pushed onto the stack the VG register is required to
unwind because the stack offsets would vary by the SVE register width at the
time when the sample was taken.

The patches ("[PATCH v2 0/2] perf: arm64: Kernel support for Dwarf unwinding
through SVE functions") add support for sampling the VG register to the kernel
and the docs. This is the patchset to add support to userspace perf.

A small change is also required to libunwind or libdw depending on which
unwinder is used, and these will be published later. Without these changes Perf
continues to work with both libraries, although the VG register is still not
used for unwinding. 

Thanks
James

James Clark (4):
  perf tools: arm64: Copy perf_regs.h from the kernel
  perf tools: Use dynamic register set for Dwarf unwind
  perf tools: arm64: Decouple Libunwind register names from Perf
  perf tools: arm64: Add support for VG register

 tools/arch/arm64/include/uapi/asm/perf_regs.h |  7 +-
 tools/perf/arch/arm64/util/perf_regs.c        | 34 +++++++++
 tools/perf/arch/arm64/util/unwind-libunwind.c | 73 +------------------
 tools/perf/util/evsel.c                       |  2 +-
 tools/perf/util/perf_regs.c                   |  2 +
 5 files changed, 45 insertions(+), 73 deletions(-)

-- 
2.28.0

-- 

- Arnaldo

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