Wait for sweeper threads when a scan on scavenge page is not swept.

src/store-buffer.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/store-buffer.h"
 
 #include <algorithm>
 
 #include "src/v8.h"
 
@@ skipping 487 matching lines @@
                  heap_object = iterator.Next()) {
               // We skip free space objects.
               if (!heap_object->IsFiller()) {
                 FindPointersToNewSpaceInRegion(
                     heap_object->address() + HeapObject::kHeaderSize,
                     heap_object->address() + heap_object->Size(), slot_callback,
                     clear_maps);
               }
             }
           } else {
+            if (page->parallel_sweeping() > MemoryChunk::SWEEPING_FINALIZE) {
+              heap_->mark_compact_collector()->SweepInParallel(page, owner);
+              if (page->parallel_sweeping() > MemoryChunk::SWEEPING_FINALIZE) {
+                // We were not able to sweep that page, i.e., a concurrent
+                // sweeper thread currently owns this page.
+                // TODO(hpayer): This may introduce a huge pause here. We
+                // just care about finish sweeping of the scan on scavenge page.
+                heap_->mark_compact_collector()->EnsureSweepingCompleted();
+              }
+            }
             FindPointersToNewSpaceInRegion(
                 start, end, slot_callback, clear_maps);
           }
         }
       }
     }
     if (callback_ != NULL) {
       (*callback_)(heap_, NULL, kStoreBufferScanningPageEvent);
     }
   }
@@ skipping 47 matching lines @@
     }
     old_buffer_is_sorted_ = false;
     old_buffer_is_filtered_ = false;
     *old_top_++ = reinterpret_cast<Address>(int_addr << kPointerSizeLog2);
     ASSERT(old_top_ <= old_limit_);
   }
   heap_->isolate()->counters()->store_buffer_compactions()->Increment();
 }
 
 } }  // namespace v8::internal