Only dump suspend all histogram if we have samples
Helps fix gcstress ThreadStress.
Bug: 18576985
Change-Id: Ibebc0fed8a21e7b149f4b6e5154fb86deddcc68f
diff --git a/runtime/thread_list.cc b/runtime/thread_list.cc
index 968e89d..9707c7b 100644
--- a/runtime/thread_list.cc
+++ b/runtime/thread_list.cc
@@ -101,9 +101,12 @@
void ThreadList::DumpForSigQuit(std::ostream& os) {
{
ScopedObjectAccess soa(Thread::Current());
- Histogram<uint64_t>::CumulativeData data;
- suspend_all_historam_.CreateHistogram(&data);
- suspend_all_historam_.PrintConfidenceIntervals(os, 0.99, data); // Dump time to suspend.
+ // Only print if we have samples.
+ if (suspend_all_historam_.SampleSize() > 0) {
+ Histogram<uint64_t>::CumulativeData data;
+ suspend_all_historam_.CreateHistogram(&data);
+ suspend_all_historam_.PrintConfidenceIntervals(os, 0.99, data); // Dump time to suspend.
+ }
}
Dump(os);
DumpUnattachedThreads(os);