commit 6d1a047b4b3f9707d4ee1cc19e99717ee021ef48
author Mathieu Chartier <mathieuc@google.com> Fri Dec 19 02:32:37 2014 +0000
committer Gerrit Code Review <noreply-gerritcodereview@google.com> Fri Dec 19 02:32:37 2014 +0000
tree 38d80321f7132212d358c1f4f851906a50886d7a
parent 16b10882f4ce9e5822b278ef0b0adf83afa1b334
parent 23f6e69e374ce4a7fd0d45f633a3c9efcc8e8a07

Merge "Only dump suspend all histogram if we have samples"

runtime/thread_list.cc

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);