diff options
| -rw-r--r-- | simpleperf/environment.cpp | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/simpleperf/environment.cpp b/simpleperf/environment.cpp index d0cb8351..7fff85f1 100644 --- a/simpleperf/environment.cpp +++ b/simpleperf/environment.cpp @@ -361,8 +361,11 @@ static const char* GetLimitLevelDescription(int limit_level) { } bool CheckPerfEventLimit() { - // root is not limited by /proc/sys/kernel/perf_event_paranoid. - if (IsRoot()) { + // Root is not limited by /proc/sys/kernel/perf_event_paranoid. However, the monitored threads + // may create child processes not running as root. To make sure the child processes have + // enough permission to create inherited tracepoint events, write -1 to perf_event_paranoid. + // See http://b/62230699. + if (IsRoot() && android::base::WriteStringToFile("-1", "/proc/sys/kernel/perf_event_paranoid")) { return true; } int limit_level; |