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diff src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.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 a61af66fc99e
children 9ee9cf798b59 a4b729f5b611
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line diff
--- a/src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp	Fri Jun 27 19:12:11 2008 -0700
+++ b/src/share/vm/gc_implementation/parallelScavenge/psMarkSweep.cpp	Wed Jul 09 15:08:55 2008 -0700
@@ -98,6 +98,9 @@
   // Increment the invocation count
   heap->increment_total_collections(true /* full */);
 
+  // Save information needed to minimize mangling
+  heap->record_gen_tops_before_GC();
+
   // We need to track unique mark sweep invocations as well.
   _total_invocations++;
 
@@ -188,6 +191,12 @@
 
     deallocate_stacks();
 
+    if (ZapUnusedHeapArea) {
+      // Do a complete mangle (top to end) because the usage for
+      // scratch does not maintain a top pointer.
+      young_gen->to_space()->mangle_unused_area_complete();
+    }
+
     eden_empty = young_gen->eden_space()->is_empty();
     if (!eden_empty) {
       eden_empty = absorb_live_data_from_eden(size_policy, young_gen, old_gen);
@@ -198,7 +207,7 @@
     Universe::update_heap_info_at_gc();
 
     survivors_empty = young_gen->from_space()->is_empty() &&
-      young_gen->to_space()->is_empty();
+                      young_gen->to_space()->is_empty();
     young_gen_empty = eden_empty && survivors_empty;
 
     BarrierSet* bs = heap->barrier_set();
@@ -344,6 +353,11 @@
     perm_gen->verify_object_start_array();
   }
 
+  if (ZapUnusedHeapArea) {
+    old_gen->object_space()->check_mangled_unused_area_complete();
+    perm_gen->object_space()->check_mangled_unused_area_complete();
+  }
+
   NOT_PRODUCT(ref_processor()->verify_no_references_recorded());
 
   if (PrintHeapAtGC) {