Move the temporary private freelist closer to where it's used

BUG=v8:3104
R=hpayer@chromium.org
LOG=n

Review URL: https://codereview.chromium.org/143193002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@18707 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mark-compact.cc

@@ -3976,18 +3976,18 @@ intptr_t MarkCompactCollector::SweepConservatively(PagedSpace* space,
 }
 
 
-void MarkCompactCollector::SweepInParallel(PagedSpace* space,
-                                           FreeList* private_free_list) {
+void MarkCompactCollector::SweepInParallel(PagedSpace* space) {
   PageIterator it(space);
   FreeList* free_list = space == heap()->old_pointer_space()
                             ? free_list_old_pointer_space_.get()
                             : free_list_old_data_space_.get();
+  FreeList private_free_list(space);
   while (it.has_next()) {
     Page* p = it.next();
 
     if (p->TryParallelSweeping()) {
-      SweepConservatively<SWEEP_IN_PARALLEL>(space, private_free_list, p);
-      free_list->Concatenate(private_free_list);
+      SweepConservatively<SWEEP_IN_PARALLEL>(space, &private_free_list, p);
+      free_list->Concatenate(&private_free_list);
     }
   }
 }

src/mark-compact.h

@@ -717,8 +717,7 @@ class MarkCompactCollector {
   MarkingParity marking_parity() { return marking_parity_; }
 
   // Concurrent and parallel sweeping support.
-  void SweepInParallel(PagedSpace* space,
-                       FreeList* private_free_list);
+  void SweepInParallel(PagedSpace* space);
 
   void WaitUntilSweepingCompleted();
 

src/sweeper-thread.cc

@@ -44,10 +44,7 @@ SweeperThread::SweeperThread(Isolate* isolate)
        collector_(heap_->mark_compact_collector()),
        start_sweeping_semaphore_(0),
        end_sweeping_semaphore_(0),
-       stop_semaphore_(0),
-       private_free_list_old_data_space_(heap_->paged_space(OLD_DATA_SPACE)),
-       private_free_list_old_pointer_space_(
-           heap_->paged_space(OLD_POINTER_SPACE)) {
+       stop_semaphore_(0) {
   NoBarrier_Store(&stop_thread_, static_cast<AtomicWord>(false));
 }
 
@@ -66,10 +63,8 @@ void SweeperThread::Run() {
       return;
     }
 
-    collector_->SweepInParallel(heap_->old_data_space(),
-                                &private_free_list_old_data_space_);
-    collector_->SweepInParallel(heap_->old_pointer_space(),
-                                &private_free_list_old_pointer_space_);
+    collector_->SweepInParallel(heap_->old_data_space());
+    collector_->SweepInParallel(heap_->old_pointer_space());
     end_sweeping_semaphore_.Signal();
   }
 }

src/sweeper-thread.h

@@ -59,8 +59,6 @@ class SweeperThread : public Thread {
   Semaphore start_sweeping_semaphore_;
   Semaphore end_sweeping_semaphore_;
   Semaphore stop_semaphore_;
-  FreeList private_free_list_old_data_space_;
-  FreeList private_free_list_old_pointer_space_;
   volatile AtomicWord stop_thread_;
 };