src/share/vm/gc/g1/g1SATBCardTableModRefBS.cpp

rev 8796 : imported patch usenewfun

*** 25,34 ****
--- 25,35 ----
  #include "precompiled.hpp"
  #include "gc/g1/g1CollectedHeap.inline.hpp"
  #include "gc/g1/g1SATBCardTableModRefBS.hpp"
  #include "gc/g1/heapRegion.hpp"
  #include "gc/g1/satbQueue.hpp"
+ #include "gc/shared/memset_with_concurrent_readers.hpp"
  #include "oops/oop.inline.hpp"
  #include "runtime/atomic.inline.hpp"
  #include "runtime/mutexLocker.hpp"
  #include "runtime/orderAccess.inline.hpp"
  #include "runtime/thread.inline.hpp"
*** 106,124 ****
  
  void G1SATBCardTableModRefBS::g1_mark_as_young(const MemRegion& mr) {
    jbyte *const first = byte_for(mr.start());
    jbyte *const last = byte_after(mr.last());
  
!   // Below we may use an explicit loop instead of memset() because on
!   // certain platforms memset() can give concurrent readers phantom zeros.
!   if (UseMemSetInBOT) {
!     memset(first, g1_young_gen, last - first);
!   } else {
!     for (jbyte* i = first; i < last; i++) {
!       *i = g1_young_gen;
!     }
!   }
  }
  
  #ifndef PRODUCT
  void G1SATBCardTableModRefBS::verify_g1_young_region(MemRegion mr) {
    verify_region(mr, g1_young_gen,  true);
--- 107,117 ----
  
  void G1SATBCardTableModRefBS::g1_mark_as_young(const MemRegion& mr) {
    jbyte *const first = byte_for(mr.start());
    jbyte *const last = byte_after(mr.last());
  
!   memset_with_concurrent_readers(first, g1_young_gen, last - first);
  }
  
  #ifndef PRODUCT
  void G1SATBCardTableModRefBS::verify_g1_young_region(MemRegion mr) {
    verify_region(mr, g1_young_gen,  true);