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diff src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp @ 1027:39b01ab7035a

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6888898: CMS: ReduceInitialCardMarks unsafe in the presence of cms precleaning 6889757: G1: enable card mark elision for initializing writes from compiled code (ReduceInitialCardMarks) Summary: Defer the (compiler-elided) card-mark upon a slow-path allocation until after the store and before the next subsequent safepoint; G1 now answers yes to can_elide_tlab_write_barriers(). Reviewed-by: jcoomes, kvn, never
author ysr
date Fri, 16 Oct 2009 02:05:46 -0700
parents 148e5441d916
children 7b0e9cba0307
line wrap: on
line diff
--- a/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp	Wed Oct 07 19:01:55 2009 -0400
+++ b/src/share/vm/gc_implementation/parallelScavenge/parallelScavengeHeap.cpp	Fri Oct 16 02:05:46 2009 -0700
@@ -314,41 +314,6 @@
   return false;
 }
 
-// Static method
-bool ParallelScavengeHeap::is_in_young(oop* p) {
-  ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
-  assert(heap->kind() == CollectedHeap::ParallelScavengeHeap,
-                                            "Must be ParallelScavengeHeap");
-
-  PSYoungGen* young_gen = heap->young_gen();
-
-  if (young_gen->is_in_reserved(p)) {
-    return true;
-  }
-
-  return false;
-}
-
-// Static method
-bool ParallelScavengeHeap::is_in_old_or_perm(oop* p) {
-  ParallelScavengeHeap* heap = (ParallelScavengeHeap*)Universe::heap();
-  assert(heap->kind() == CollectedHeap::ParallelScavengeHeap,
-                                            "Must be ParallelScavengeHeap");
-
-  PSOldGen* old_gen = heap->old_gen();
-  PSPermGen* perm_gen = heap->perm_gen();
-
-  if (old_gen->is_in_reserved(p)) {
-    return true;
-  }
-
-  if (perm_gen->is_in_reserved(p)) {
-    return true;
-  }
-
-  return false;
-}
-
 // There are two levels of allocation policy here.
 //
 // When an allocation request fails, the requesting thread must invoke a VM
@@ -764,6 +729,13 @@
   CollectedHeap::resize_all_tlabs();
 }
 
+bool ParallelScavengeHeap::can_elide_initializing_store_barrier(oop new_obj) {
+  // We don't need barriers for stores to objects in the
+  // young gen and, a fortiori, for initializing stores to
+  // objects therein.
+  return is_in_young(new_obj);
+}
+
 // This method is used by System.gc() and JVMTI.
 void ParallelScavengeHeap::collect(GCCause::Cause cause) {
   assert(!Heap_lock->owned_by_self(),