tree a4c97c1237353d10ff105b2017a012356c9a868a
parent cee718a1c68eaaf7c3cc81be9a4c89fca1ea96ad
author Yabin Cui <yabinc@google.com> 1466622885 -0700
committer Yabin Cui <yabinc@google.com> 1466622885 -0700

Simpleperf: check root privilege for system wide profiling.

Giving the suggestion to run as root is better than reporting
a bunch of failures trying to open perf_event files.

Bug: 29574526
Change-Id: Id7b7586a5aa7e79e4ef821f9ab710ccdf550ed94
Test: run `simpleperf record -a` with non root and check the error message.