Messages in this thread | | | From | James Clark <> | Subject | [PATCH v2 0/2] perf: arm64: Kernel support for Dwarf unwinding through SVE functions | Date | Tue, 17 May 2022 11:07:41 +0100 |
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Changes since v1:
* Add Mark's review tag * Clarify in docs that it's the SVE register length * Split patchset into kernel side and Perf tool changes
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.
These first two patches add support for sampling the VG register to the kernel and the docs. There is another 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 (2): perf: arm64: Add SVE vector granule register to user regs arm64/sve: Add Perf extensions documentation
Documentation/arm64/sve.rst | 20 +++++++++++++++++ arch/arm64/include/uapi/asm/perf_regs.h | 7 +++++- arch/arm64/kernel/perf_regs.c | 30 +++++++++++++++++++++++-- drivers/perf/arm_pmu.c | 2 +- 4 files changed, 55 insertions(+), 4 deletions(-)
-- 2.28.0
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