# HG changeset patch
# User zgu
# Date 1373562912 14400
# Node ID c9a5fab392345759d9f26f087ed04837cf09cc9c
# Parent  e79a9f26ba2e49540bc1e1d26f44b3945b282882
8012241: NMT huge memory footprint, it usually leads to OOME
Summary: Enforce memory limitation on NMT to prevent JVM OOM
Reviewed-by: acorn, dcubed, minqi

diff -r e79a9f26ba2e -r c9a5fab39234 src/share/vm/services/memTracker.cpp
--- a/src/share/vm/services/memTracker.cpp	Mon Jul 08 18:26:26 2013 -0700
+++ b/src/share/vm/services/memTracker.cpp	Thu Jul 11 13:15:12 2013 -0400
@@ -385,6 +385,7 @@
 #define SAFE_SEQUENCE_THRESHOLD    30
 #define HIGH_GENERATION_THRESHOLD  60
 #define MAX_RECORDER_THREAD_RATIO  30
+#define MAX_RECORDER_PER_THREAD    100
 
 void MemTracker::sync() {
   assert(_tracking_level > NMT_off, "NMT is not enabled");
@@ -437,6 +438,11 @@
         // means that worker thread is lagging behind in processing them.
         if (!AutoShutdownNMT) {
           _slowdown_calling_thread = (MemRecorder::_instance_count > MAX_RECORDER_THREAD_RATIO * _thread_count);
+        } else {
+          // If auto shutdown is on, enforce MAX_RECORDER_PER_THREAD threshold to prevent OOM
+          if (MemRecorder::_instance_count >= _thread_count * MAX_RECORDER_PER_THREAD) {
+            shutdown(NMT_out_of_memory);
+          }
         }
 
         // check _worker_thread with lock to avoid racing condition