[heap] Print more info in incremental marking tracing.

src/heap/heap.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/heap/heap.h"
 
 #include "src/accessors.h"
 #include "src/api.h"
 #include "src/ast/context-slot-cache.h"
 #include "src/base/bits.h"
@@ skipping 946 matching lines @@
   // for this is that we have a lot of allocation sequences and we
   // assume that a garbage collection will allow the subsequent
   // allocation attempts to go through.
   allocation_timeout_ = Max(6, FLAG_gc_interval);
 #endif
 
   EnsureFillerObjectAtTop();
 
   if (collector == SCAVENGER && !incremental_marking()->IsStopped()) {
     if (FLAG_trace_incremental_marking) {
-      PrintF("[IncrementalMarking] Scavenge during marking.\n");
+      isolate()->PrintWithTimestamp(
+          "[IncrementalMarking] Scavenge during marking.\n");
     }
   }
 
   if (collector == MARK_COMPACTOR && !ShouldFinalizeIncrementalMarking() &&
       !ShouldAbortIncrementalMarking() && !incremental_marking()->IsStopped() &&
       !incremental_marking()->should_hurry() && FLAG_incremental_marking &&
       OldGenerationAllocationLimitReached()) {
     if (!incremental_marking()->IsComplete() &&
         !mark_compact_collector()->marking_deque_.IsEmpty() &&
         !FLAG_gc_global) {
       if (FLAG_trace_incremental_marking) {
-        PrintF("[IncrementalMarking] Delaying MarkSweep.\n");
+        isolate()->PrintWithTimestamp(
+            "[IncrementalMarking] Delaying MarkSweep.\n");
       }
       collector = SCAVENGER;
       collector_reason = "incremental marking delaying mark-sweep";
     }
   }
 
   bool next_gc_likely_to_collect_more = false;
   intptr_t committed_memory_before = 0;
 
   if (collector == MARK_COMPACTOR) {
@@ skipping 5511 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8