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diff src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 8853:2e093b564241

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7014552: gc/lock/jni/jnilockXXX works too slow on 1-processor machine Summary: Keep a counter of how many times we were stalled by the GC locker, add a diagnostic flag which sets the limit. Reviewed-by: brutisso, ehelin, johnc
author mgerdin
date Thu, 28 Mar 2013 10:27:28 +0100
parents 3c226052f7dc
children 7b835924c31c
line wrap: on
line diff
--- a/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp	Wed Mar 27 10:55:37 2013 +0100
+++ b/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp	Thu Mar 28 10:27:28 2013 +0100
@@ -326,6 +326,7 @@
 
   uint loop_count = 0;
   uint gc_count = 0;
+  int gclocker_stalled_count = 0;
 
   while (result == NULL) {
     // We don't want to have multiple collections for a single filled generation.
@@ -354,6 +355,10 @@
         return result;
       }
 
+      if (gclocker_stalled_count > GCLockerRetryAllocationCount) {
+        return NULL;
+      }
+
       // Failed to allocate without a gc.
       if (GC_locker::is_active_and_needs_gc()) {
         // If this thread is not in a jni critical section, we stall
@@ -366,6 +371,7 @@
         if (!jthr->in_critical()) {
           MutexUnlocker mul(Heap_lock);
           GC_locker::stall_until_clear();
+          gclocker_stalled_count += 1;
           continue;
         } else {
           if (CheckJNICalls) {