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diff src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp @ 453:c96030fff130

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6684579: SoftReference processing can be made more efficient Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not. Reviewed-by: jmasa
author ysr
date Thu, 20 Nov 2008 16:56:09 -0800
parents 0166ac265d53
children 27a80744a83b
line wrap: on
line diff
--- a/src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp	Thu Nov 20 12:27:41 2008 -0800
+++ b/src/share/vm/gc_implementation/parallelScavenge/psParallelCompact.cpp	Thu Nov 20 16:56:09 2008 -0800
@@ -1578,6 +1578,7 @@
     COMPILER2_PRESENT(DerivedPointerTable::clear());
 
     ref_processor()->enable_discovery();
+    ref_processor()->snap_policy(maximum_heap_compaction);
 
     bool marked_for_unloading = false;
 
@@ -1894,26 +1895,14 @@
   // Process reference objects found during marking
   {
     TraceTime tm_r("reference processing", print_phases(), true, gclog_or_tty);
-    ReferencePolicy *soft_ref_policy;
-    if (maximum_heap_compaction) {
-      soft_ref_policy = new AlwaysClearPolicy();
-    } else {
-#ifdef COMPILER2
-      soft_ref_policy = new LRUMaxHeapPolicy();
-#else
-      soft_ref_policy = new LRUCurrentHeapPolicy();
-#endif // COMPILER2
-    }
-    assert(soft_ref_policy != NULL, "No soft reference policy");
     if (ref_processor()->processing_is_mt()) {
       RefProcTaskExecutor task_executor;
       ref_processor()->process_discovered_references(
-        soft_ref_policy, is_alive_closure(), &mark_and_push_closure,
-        &follow_stack_closure, &task_executor);
+        is_alive_closure(), &mark_and_push_closure, &follow_stack_closure,
+        &task_executor);
     } else {
       ref_processor()->process_discovered_references(
-        soft_ref_policy, is_alive_closure(), &mark_and_push_closure,
-        &follow_stack_closure, NULL);
+        is_alive_closure(), &mark_and_push_closure, &follow_stack_closure, NULL);
     }
   }