Added more detailed sweeping timing counters.

src/mark-compact.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/v8.h"
 
 #include "src/base/atomicops.h"
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/cpu-profiler.h"
@@ skipping 4206 matching lines @@
     if (how_to_sweep == PARALLEL_CONSERVATIVE ||
         how_to_sweep == CONCURRENT_CONSERVATIVE) {
       StartSweeperThreads();
     }
 
     if (how_to_sweep == PARALLEL_CONSERVATIVE) {
       WaitUntilSweepingCompleted();
     }
   }
   RemoveDeadInvalidatedCode();
-  SweepSpace(heap()->code_space(), PRECISE);
 
-  SweepSpace(heap()->cell_space(), PRECISE);
-  SweepSpace(heap()->property_cell_space(), PRECISE);
+  { GCTracer::Scope sweep_scope(tracer_, GCTracer::Scope::MC_SWEEP_CODE);
+    SweepSpace(heap()->code_space(), PRECISE);
+  }
+
+  { GCTracer::Scope sweep_scope(tracer_, GCTracer::Scope::MC_SWEEP_CELL);
+    SweepSpace(heap()->cell_space(), PRECISE);
+    SweepSpace(heap()->property_cell_space(), PRECISE);
+  }
 
   EvacuateNewSpaceAndCandidates();
 
   // ClearNonLiveTransitions depends on precise sweeping of map space to
   // detect whether unmarked map became dead in this collection or in one
   // of the previous ones.
-  SweepSpace(heap()->map_space(), PRECISE);
+  { GCTracer::Scope sweep_scope(tracer_, GCTracer::Scope::MC_SWEEP_MAP);
+    SweepSpace(heap()->map_space(), PRECISE);
+  }
 
   // Deallocate unmarked objects and clear marked bits for marked objects.
   heap_->lo_space()->FreeUnmarkedObjects();
 
   // Deallocate evacuated candidate pages.
   ReleaseEvacuationCandidates();
 }
 
 
 void MarkCompactCollector::ParallelSweepSpaceComplete(PagedSpace* space) {
@@ skipping 233 matching lines @@
   while (buffer != NULL) {
     SlotsBuffer* next_buffer = buffer->next();
     DeallocateBuffer(buffer);
     buffer = next_buffer;
   }
   *buffer_address = NULL;
 }
 
 
 } }  // namespace v8::internal