--- old/src/share/vm/gc/g1/g1Allocator.cpp	2015-08-19 10:56:40.266627392 +0200
+++ new/src/share/vm/gc/g1/g1Allocator.cpp	2015-08-19 10:56:40.184624978 +0200
@@ -144,11 +144,20 @@
 HeapWord* G1Allocator::par_allocate_during_gc(InCSetState dest,
                                               size_t word_size,
                                               AllocationContext_t context) {
+  size_t temp;
+  return par_allocate_during_gc(dest, word_size, word_size, &temp, context);
+}
+
+HeapWord* G1Allocator::par_allocate_during_gc(InCSetState dest,
+                                              size_t min_word_size,
+                                              size_t desired_word_size,
+                                              size_t* actual_word_size,
+                                              AllocationContext_t context) {
   switch (dest.value()) {
     case InCSetState::Young:
-      return survivor_attempt_allocation(word_size, context);
+      return survivor_attempt_allocation(min_word_size, desired_word_size, actual_word_size, context);
     case InCSetState::Old:
-      return old_attempt_allocation(word_size, context);
+      return old_attempt_allocation(min_word_size, desired_word_size, actual_word_size, context);
     default:
       ShouldNotReachHere();
       return NULL; // Keep some compilers happy
@@ -171,37 +180,49 @@
   _old_is_full = true;
 }
 
-HeapWord* G1Allocator::survivor_attempt_allocation(size_t word_size,
+HeapWord* G1Allocator::survivor_attempt_allocation(size_t min_word_size,
+                                                   size_t desired_word_size,
+                                                   size_t* actual_word_size,
                                                    AllocationContext_t context) {
-  assert(!_g1h->is_humongous(word_size),
+  assert(!_g1h->is_humongous(desired_word_size),
          "we should not be seeing humongous-size allocations in this path");
 
-  HeapWord* result = survivor_gc_alloc_region(context)->attempt_allocation(word_size,
+  HeapWord* result = survivor_gc_alloc_region(context)->attempt_allocation(min_word_size,
+                                                                           desired_word_size,
+                                                                           actual_word_size,
                                                                            false /* bot_updates */);
   if (result == NULL && !survivor_is_full(context)) {
     MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
-    result = survivor_gc_alloc_region(context)->attempt_allocation_locked(word_size,
+    result = survivor_gc_alloc_region(context)->attempt_allocation_locked(min_word_size,
+                                                                          desired_word_size,
+                                                                          actual_word_size,
                                                                           false /* bot_updates */);
     if (result == NULL) {
       set_survivor_full(context);
     }
   }
   if (result != NULL) {
-    _g1h->dirty_young_block(result, word_size);
+    _g1h->dirty_young_block(result, *actual_word_size);
   }
   return result;
 }
 
-HeapWord* G1Allocator::old_attempt_allocation(size_t word_size,
+HeapWord* G1Allocator::old_attempt_allocation(size_t min_word_size,
+                                              size_t desired_word_size,
+                                              size_t* actual_word_size,
                                               AllocationContext_t context) {
-  assert(!_g1h->is_humongous(word_size),
+  assert(!_g1h->is_humongous(desired_word_size),
          "we should not be seeing humongous-size allocations in this path");
 
-  HeapWord* result = old_gc_alloc_region(context)->attempt_allocation(word_size,
+  HeapWord* result = old_gc_alloc_region(context)->attempt_allocation(min_word_size,
+                                                                      desired_word_size,
+                                                                      actual_word_size,
                                                                       true /* bot_updates */);
   if (result == NULL && !old_is_full(context)) {
     MutexLockerEx x(FreeList_lock, Mutex::_no_safepoint_check_flag);
-    result = old_gc_alloc_region(context)->attempt_allocation_locked(word_size,
+    result = old_gc_alloc_region(context)->attempt_allocation_locked(min_word_size,
+                                                                     desired_word_size,
+                                                                     actual_word_size,
                                                                      true /* bot_updates */);
     if (result == NULL) {
       set_old_full(context);
@@ -243,10 +264,15 @@
     G1PLAB* alloc_buf = alloc_buffer(dest, context);
     alloc_buf->retire();
 
-    HeapWord* buf = _allocator->par_allocate_during_gc(dest, plab_word_size, context);
+    size_t actual_plab_size;
+    HeapWord* buf = _allocator->par_allocate_during_gc(dest,
+                                                       required_in_plab,
+                                                       plab_word_size,
+                                                       &actual_plab_size,
+                                                       context);
     if (buf != NULL) {
       // Otherwise.
-      alloc_buf->set_buf(buf, plab_word_size);
+      alloc_buf->set_buf(buf, actual_plab_size);
 
       HeapWord* const obj = alloc_buf->allocate(word_sz);
       assert(obj != NULL, err_msg("PLAB should have been big enough, tried to allocate "