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author | Treehugger Robot <treehugger-gerrit@google.com> | 2017-06-01 23:29:12 +0000 |
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committer | Gerrit Code Review <noreply-gerritcodereview@google.com> | 2017-06-01 23:29:14 +0000 |
commit | 668878b3b73878edb9bcf960bd44cc07ec136cb0 (patch) | |
tree | a75ee11953caa54ae80a8fd4b94db9e6c7b819b3 | |
parent | f4f68176b3127d3b71a66ec63197849e50de3e5d (diff) | |
parent | 1137a8c357b1e5eabca80f98c3f34f7907794ee0 (diff) | |
download | extras-668878b3b73878edb9bcf960bd44cc07ec136cb0.tar.gz |
Merge "simpleperf: write -1 to perf_event_paranoid when running as root."
-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; |