Hello Reinette,
Thank you for your comments.
> Just to confirm, does "not supported on Arm" imply that perf_event_open()
> fails when
> exclude_idle is 1? Thus encountering:
> EPERM Returned on many (but not all) architectures when an
> unsupported
> exclude_hv, exclude_idle, exclude_user, or exclude_kernel
> setting is
> specified.
perf_event_open() fails and returns EOPNOTSUPP.
perf_event_open({type=PERF_TYPE_RAW, size=0x88 /* PERF_ATTR_SIZE_??? */,
config=0x3, sample_period=0, sample_type=PERF_SAMPLE_IDENTIFIER,
read_format=PERF_FORMAT_GROUP, disabled=1, inherit=1, exclude_kernel=1,
exclude_hv=1, exclude_idle=1, precise_ip=0 /* arbitrary skid */,
exclude_guest=1, exclude_callchain_kernel=1, ...}, 14260, 1, -1,
PERF_FLAG_FD_CLOEXEC) = -1 EOPNOTSUPP
Other suggestions will be addressed in the next patch series. Thank you.
Best regards,
Shaopeng TAN
