[heap] New heuristics for starting of incremental marking.

src/heap/spaces.cc

 // Copyright 2011 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/spaces.h"
 
 #include <utility>
 
 #include "src/base/bits.h"
 #include "src/base/platform/platform.h"
@@ skipping 2871 matching lines @@
     // If sweeping is still in progress try to sweep pages on the main thread.
     int max_freed = collector->sweeper().ParallelSweepSpace(
         identity(), size_in_bytes, kMaxPagesToSweep);
     RefillFreeList();
     if (max_freed >= size_in_bytes) {
       object = free_list_.Allocate(size_in_bytes);
       if (object != nullptr) return object;
     }
   }
 
-  // Free list allocation failed and there is no next page.  Fail if we have
-  // hit the old generation size limit that should cause a garbage
-  // collection.
-  if (!heap()->always_allocate() &&
-      heap()->OldGenerationAllocationLimitReached()) {
-    // If sweeper threads are active, wait for them at that point and steal
-    // elements form their free-lists.
-    HeapObject* object = SweepAndRetryAllocation(size_in_bytes);
-    return object;
-  }
-
-  // Try to expand the space and allocate in the new next page.
-  if (Expand()) {
+  if (heap()->ShouldExpandOldGenerationOnAllocationFailure() && Expand()) {
     DCHECK((CountTotalPages() > 1) ||
            (size_in_bytes <= free_list_.Available()));
     return free_list_.Allocate(size_in_bytes);
   }
 
   // If sweeper threads are active, wait for them at that point and steal
   // elements form their free-lists. Allocation may still fail their which
   // would indicate that there is not enough memory for the given allocation.
   return SweepAndRetryAllocation(size_in_bytes);
 }
@@ skipping 366 matching lines @@
     object->ShortPrint();
     PrintF("\n");
   }
   printf(" --------------------------------------\n");
   printf(" Marked: %x, LiveCount: %x\n", mark_size, LiveBytes());
 }
 
 #endif  // DEBUG
 }  // namespace internal
 }  // namespace v8