Oilpan: Discard unused system pages when sweeping NormalPageHeaps

third_party/WebKit/Source/platform/heap/Heap.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 12 matching lines @@
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "platform/heap/Heap.h"
 
+#include "base/sys_info.h"
 #include "platform/Histogram.h"
 #include "platform/ScriptForbiddenScope.h"
 #include "platform/TraceEvent.h"
 #include "platform/heap/BlinkGCMemoryDumpProvider.h"
 #include "platform/heap/CallbackStack.h"
 #include "platform/heap/MarkingVisitor.h"
 #include "platform/heap/PageMemory.h"
 #include "platform/heap/PagePool.h"
 #include "platform/heap/SafePoint.h"
 #include "platform/heap/ThreadState.h"
@@ skipping 124 matching lines @@
     s_allocatedSpace = 0;
     s_allocatedObjectSize = 0;
     s_objectSizeAtLastGC = 0;
     s_markedObjectSize = 0;
     s_markedObjectSizeAtLastCompleteSweep = 0;
     s_wrapperCount = 0;
     s_wrapperCountAtLastGC = 0;
     s_collectedWrapperCount = 0;
     s_partitionAllocSizeAtLastGC = WTF::Partitions::totalSizeOfCommittedPages();
     s_estimatedMarkingTimePerByte = 0.0;
+    s_isLowEndDevice = base::SysInfo::IsLowEndDevice();
 #if ENABLE(ASSERT)
     s_gcGeneration = 1;
 #endif
 
     GCInfoTable::init();
 
     if (Platform::current() && Platform::current()->currentThread())
         Platform::current()->registerMemoryDumpProvider(BlinkGCMemoryDumpProvider::instance(), "BlinkGC");
 }
 
@@ skipping 531 matching lines @@
 size_t Heap::s_allocatedSpace = 0;
 size_t Heap::s_allocatedObjectSize = 0;
 size_t Heap::s_objectSizeAtLastGC = 0;
 size_t Heap::s_markedObjectSize = 0;
 size_t Heap::s_markedObjectSizeAtLastCompleteSweep = 0;
 size_t Heap::s_wrapperCount = 0;
 size_t Heap::s_wrapperCountAtLastGC = 0;
 size_t Heap::s_collectedWrapperCount = 0;
 size_t Heap::s_partitionAllocSizeAtLastGC = 0;
 double Heap::s_estimatedMarkingTimePerByte = 0.0;
+bool Heap::s_isLowEndDevice = false;
 #if ENABLE(ASSERT)
 uint16_t Heap::s_gcGeneration = 0;
 #endif
 
 } // namespace blink