[heap] Reland "Add a guard for restarting the memory reducer after mark-compact."

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 995 matching lines @@
       event.type = MemoryReducer::kMarkCompact;
       event.time_ms = MonotonicallyIncreasingTimeInMs();
       // Trigger one more GC if
       // - this GC decreased committed memory,
       // - there is high fragmentation,
       // - there are live detached contexts.
       event.next_gc_likely_to_collect_more =
           (committed_memory_before > committed_memory_after + MB) ||
           HasHighFragmentation(used_memory_after, committed_memory_after) ||
           (detached_contexts()->length() > 0);
+      event.committed_memory = committed_memory_after;
       if (deserialization_complete_) {
         memory_reducer_->NotifyMarkCompact(event);
       }
       memory_pressure_level_.SetValue(MemoryPressureLevel::kNone);
     }
 
     tracer()->Stop(collector);
   }
 
   if (collector == MARK_COMPACTOR &&
@@ skipping 5432 matching lines @@
 }
 
 
 // static
 int Heap::GetStaticVisitorIdForMap(Map* map) {
   return StaticVisitorBase::GetVisitorId(map);
 }
 
 }  // namespace internal
 }  // namespace v8