Add MemoryPurgeController.ReclaimedPartitionAllocInactiveTab

third_party/WebKit/Source/platform/MemoryPurgeController.cpp

 // Copyright 2015 The Chromium 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 "config.h"
 #include "platform/MemoryPurgeController.h"
 
 #include "platform/TraceEvent.h"
 #include "public/platform/Platform.h"
 #include "wtf/Partitions.h"
@@ skipping 27 matching lines @@
 }
 
 void MemoryPurgeController::pageBecameInactive()
 {
     if (!m_inactiveTimer.isActive())
         m_inactiveTimer.startOneShot(kInactiveTimerIntervalInSecond, BLINK_FROM_HERE);
 }
 
 void MemoryPurgeController::pageInactiveTask(Timer<MemoryPurgeController>*)
 {
+    static const size_t maxSizeInKB = 10 * 1024;
+
+    size_t totalSizeBefore = WTF::Partitions::totalSizeOfCommittedPages();
     purgeMemory(MemoryPurgeMode::InactiveTab);
+    size_t totalSizeAfter = WTF::Partitions::totalSizeOfCommittedPages();
+    if (totalSizeAfter >= totalSizeBefore)
+        return;
+    size_t reclaimedInKB = (totalSizeBefore - totalSizeAfter) / 1024 + 1;
+    if (reclaimedInKB >= maxSizeInKB)
+        reclaimedInKB = maxSizeInKB - 1;
+    Platform::current()->histogramCustomCounts("MemoryPurgeController.ReclaimedPartitionAllocInactiveTab", reclaimedInKB, 1, maxSizeInKB, 50);
 }
 
 void MemoryPurgeController::purgeMemory(MemoryPurgeMode purgeMode)
 {
     TRACE_EVENT0("blink", "MemoryPurgeController::purgeMemory");
     for (auto& client : m_clients)
         client->purgeMemory(purgeMode, m_deviceKind);
     WTF::Partitions::decommitFreeableMemory();
 }
 
 DEFINE_TRACE(MemoryPurgeController)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_clients);
 #endif
 }
 
 } // namespace blink