[heap] Relax condition for forced finalization of incremental marking.

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 247 matching lines @@
     *reason = "GC in old space requested";
     return MARK_COMPACTOR;
   }
 
   if (FLAG_gc_global || (FLAG_stress_compaction && (gc_count_ & 1) != 0)) {
     *reason = "GC in old space forced by flags";
     return MARK_COMPACTOR;
   }
 
   if (incremental_marking()->NeedsFinalization() &&
-      OldGenerationSpaceAvailable() == 0) {
+      AllocationLimitOvershotByLargeMargin()) {
     *reason = "Incremental marking needs finalization";
     return MARK_COMPACTOR;
   }
 
   // Is there enough space left in OLD to guarantee that a scavenge can
   // succeed?
   //
   // Note that MemoryAllocator->MaxAvailable() undercounts the memory available
   // for object promotion. It counts only the bytes that the memory
   // allocator has not yet allocated from the OS and assigned to any space,
@@ skipping 5034 matching lines @@
 // major GC. It happens when the old generation allocation limit is reached and
 // - either we need to optimize for memory usage,
 // - or the incremental marking is not in progress and we cannot start it.
 bool Heap::ShouldExpandOldGenerationOnSlowAllocation() {
   if (always_allocate() || OldGenerationSpaceAvailable() > 0) return true;
   // We reached the old generation allocation limit.
 
   if (ShouldOptimizeForMemoryUsage()) return false;
 
   if (incremental_marking()->NeedsFinalization()) {
-    return false;
+    return !AllocationLimitOvershotByLargeMargin();
   }
 
   if (incremental_marking()->IsStopped() &&
       IncrementalMarkingLimitReached() == IncrementalMarkingLimit::kNoLimit) {
     // We cannot start incremental marking.
     return false;
   }
   return true;
 }
 
@@ skipping 1160 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8