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Subject[PATCH v4 0/2] perf: arm/arm64: Improve completeness for kernel address space
This patch set is to improve completeness for kernel address space for
arm/arm64; it adds architecture specific tweaking for the kernel start
address, thus can include the memory regions which are prior to '_stext'
symbol. With this change, we can see the eBPF program can be parsed
properly on arm64.

This patch set is a following up version for the old patch "perf cs-etm:
Improve completeness for kernel address space" [1]; the old patch was
only to fix the issue for CoreSight ETM event; but the kernel address space
issue is not only limited to CoreSight event, it should be a common issue
for other events (e.g. PMU events), clock events for profiling eBPF
program. So this patch set tries to resolve it as a common issue for
arm/arm64 archs.

When implemented related code, I tried to use the API
machine__create_extra_kernel_maps(); but I found the 'perf script' tool
directly calls machine__get_kernel_start() instead of running into
the flow for machine__create_extra_kernel_maps(); this is the reason I
don't use machine__create_extra_kernel_maps() for tweaking kernel start
address and refactor machine__get_kernel_start() alternatively.

If there have better method to resolve this issue, any suggestions and
comments are very welcome!


Leo Yan (2):
perf machine: Support arch's specific kernel start address
perf machine: arm/arm64: Improve completeness for kernel address space

tools/perf/Makefile.config | 22 ++++++++++++++++++++++
tools/perf/arch/arm/util/Build | 2 ++
tools/perf/arch/arm/util/machine.c | 17 +++++++++++++++++
tools/perf/arch/arm64/util/Build | 1 +
tools/perf/arch/arm64/util/machine.c | 17 +++++++++++++++++
tools/perf/arch/x86/util/machine.c | 10 ++++++++++
tools/perf/util/machine.c | 13 +++++++------
tools/perf/util/machine.h | 2 ++
8 files changed, 78 insertions(+), 6 deletions(-)
create mode 100644 tools/perf/arch/arm/util/machine.c
create mode 100644 tools/perf/arch/arm64/util/machine.c


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