simpleperf: avoid errors/warnings caused by sepolicy.
If running in an app user id, sepolicy doesn't allow reading
many /proc and /sys files, like /proc/<pid> belonging to
other users, /sys/kernel/notes, /proc/sys/kernel/perf_event_paranoid,
/proc/sys/kernel/kptr_restrict.
With this patch, simpleperf doesn't read /proc/<pid> belonging to
other users, and doesn't report error/warning when failing to read
/proc/sys/* files.
Bug: http://b/32460013
Test: run `simpleperf record` in an app user id.
Test: run simpleperf_unit_test.
Test: run simpleperf runtest.py.
Change-Id: I6618fbd10a9112637c8e501ec76628c9ec4ccaa7
4 files changed