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diff src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.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/cardTableExtension.cpp	Fri Jun 27 19:12:11 2008 -0700
+++ b/src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.cpp	Wed Jul 09 15:08:55 2008 -0700
@@ -666,9 +666,9 @@
 
     HeapWord* new_end_for_commit =
       MIN2(cur_committed.end(), _guard_region.start());
-    MemRegion new_committed =
-      MemRegion(new_start_aligned, new_end_for_commit);
-    if(!new_committed.is_empty()) {
+    if(new_start_aligned < new_end_for_commit) {
+      MemRegion new_committed =
+        MemRegion(new_start_aligned, new_end_for_commit);
       if (!os::commit_memory((char*)new_committed.start(),
                              new_committed.byte_size())) {
         vm_exit_out_of_memory(new_committed.byte_size(),