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diff src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp @ 263:12eea04c8b06

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6672698: mangle_unused_area() should not remangle the entire heap at each collection. Summary: Maintain a high water mark for the allocations in a space and mangle only up to that high water mark. Reviewed-by: ysr, apetrusenko
author jmasa
date Wed, 09 Jul 2008 15:08:55 -0700
parents ba764ed4b6f2
children 850fdf70db2b
line wrap: on
line diff
--- a/src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp	Fri Jun 27 19:12:11 2008 -0700
+++ b/src/share/vm/gc_implementation/parallelScavenge/psScavenge.cpp	Wed Jul 09 15:08:55 2008 -0700
@@ -265,6 +265,11 @@
     young_gen->eden_space()->accumulate_statistics();
   }
 
+  if (ZapUnusedHeapArea) {
+    // Save information needed to minimize mangling
+    heap->record_gen_tops_before_GC();
+  }
+
   if (PrintHeapAtGC) {
     Universe::print_heap_before_gc();
   }
@@ -315,7 +320,7 @@
     if (!ScavengeWithObjectsInToSpace) {
       assert(young_gen->to_space()->is_empty(),
              "Attempt to scavenge with live objects in to_space");
-      young_gen->to_space()->clear();
+      young_gen->to_space()->clear(SpaceDecorator::Mangle);
     } else if (ZapUnusedHeapArea) {
       young_gen->to_space()->mangle_unused_area();
     }
@@ -437,8 +442,10 @@
 
     if (!promotion_failure_occurred) {
       // Swap the survivor spaces.
-      young_gen->eden_space()->clear();
-      young_gen->from_space()->clear();
+
+
+      young_gen->eden_space()->clear(SpaceDecorator::Mangle);
+      young_gen->from_space()->clear(SpaceDecorator::Mangle);
       young_gen->swap_spaces();
 
       size_t survived = young_gen->from_space()->used_in_bytes();
@@ -600,6 +607,12 @@
     Universe::print_heap_after_gc();
   }
 
+  if (ZapUnusedHeapArea) {
+    young_gen->eden_space()->check_mangled_unused_area_complete();
+    young_gen->from_space()->check_mangled_unused_area_complete();
+    young_gen->to_space()->check_mangled_unused_area_complete();
+  }
+
   scavenge_exit.update();
 
   if (PrintGCTaskTimeStamps) {