Allow main thread to contribute to the sweeping phase.

src/sweeper-thread.cc

 // Copyright 2012 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/sweeper-thread.h"
 
 #include "src/v8.h"
 
 #include "src/isolate.h"
 #include "src/v8threads.h"
@@ skipping 23 matching lines @@
   DisallowHandleDereference no_deref;
 
   while (true) {
     start_sweeping_semaphore_.Wait();
 
     if (base::Acquire_Load(&stop_thread_)) {
       stop_semaphore_.Signal();
       return;
     }
 
-    collector_->SweepInParallel(heap_->old_data_space());
-    collector_->SweepInParallel(heap_->old_pointer_space());
+    collector_->SweepInParallel<MarkCompactCollector::SWEEP_IN_PARALLEL>(
+        heap_->old_data_space(), 0);
+    collector_->SweepInParallel<MarkCompactCollector::SWEEP_IN_PARALLEL>(
+        heap_->old_pointer_space(), 0);
     end_sweeping_semaphore_.Signal();
   }
 }
 
 
 void SweeperThread::Stop() {
   base::Release_Store(&stop_thread_, static_cast<base::AtomicWord>(true));
   start_sweeping_semaphore_.Signal();
   stop_semaphore_.Wait();
   Join();
@@ skipping 21 matching lines @@
 
 int SweeperThread::NumberOfThreads(int max_available) {
   if (!FLAG_concurrent_sweeping && !FLAG_parallel_sweeping) return 0;
   if (FLAG_sweeper_threads > 0) return FLAG_sweeper_threads;
   if (FLAG_concurrent_sweeping) return max_available - 1;
   ASSERT(FLAG_parallel_sweeping);
   return max_available;
 }
 
 } }  // namespace v8::internal