Create a dedicated partition for array buffers

third_party/WebKit/Source/wtf/allocator/Partitions.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 25 matching lines @@
 
 namespace WTF {
 
 const char* const Partitions::kAllocatedObjectPoolName =
     "partition_alloc/allocated_objects";
 
 base::subtle::SpinLock Partitions::s_initializationLock;
 bool Partitions::s_initialized = false;
 
 base::PartitionAllocatorGeneric Partitions::m_fastMallocAllocator;
+base::PartitionAllocatorGeneric Partitions::m_arrayBufferAllocator;
 base::PartitionAllocatorGeneric Partitions::m_bufferAllocator;
 base::SizeSpecificPartitionAllocator<1024> Partitions::m_layoutAllocator;
 Partitions::ReportPartitionAllocSizeFunction Partitions::m_reportSizeFunction =
     nullptr;
 
 void Partitions::initialize(
     ReportPartitionAllocSizeFunction reportSizeFunction) {
   base::subtle::SpinLock::Guard guard(s_initializationLock);
 
   if (!s_initialized) {
     base::PartitionAllocGlobalInit(&Partitions::handleOutOfMemory);
     m_fastMallocAllocator.init();
+    m_arrayBufferAllocator.init();
     m_bufferAllocator.init();
     m_layoutAllocator.init();
     m_reportSizeFunction = reportSizeFunction;
     s_initialized = true;
   }
 }
 
 void Partitions::decommitFreeableMemory() {
   RELEASE_ASSERT(isMainThread());
   if (!s_initialized)
     return;
 
+  PartitionPurgeMemoryGeneric(arrayBufferPartition(),
+                              base::PartitionPurgeDecommitEmptyPages);
   PartitionPurgeMemoryGeneric(bufferPartition(),
                               base::PartitionPurgeDecommitEmptyPages);
   PartitionPurgeMemoryGeneric(fastMallocPartition(),
                               base::PartitionPurgeDecommitEmptyPages);
   PartitionPurgeMemory(layoutPartition(),
                        base::PartitionPurgeDecommitEmptyPages);
 }
 
 void Partitions::reportMemoryUsageHistogram() {
   static size_t observedMaxSizeInMB = 0;
@@ skipping 14 matching lines @@
 void Partitions::dumpMemoryStats(
     bool isLightDump,
     base::PartitionStatsDumper* partitionStatsDumper) {
   // Object model and rendering partitions are not thread safe and can be
   // accessed only on the main thread.
   DCHECK(isMainThread());
 
   decommitFreeableMemory();
   PartitionDumpStatsGeneric(fastMallocPartition(), "fast_malloc", isLightDump,
                             partitionStatsDumper);
+  PartitionDumpStatsGeneric(arrayBufferPartition(), "array_buffer", isLightDump,
+                            partitionStatsDumper);
   PartitionDumpStatsGeneric(bufferPartition(), "buffer", isLightDump,
                             partitionStatsDumper);
   PartitionDumpStats(layoutPartition(), "layout", isLightDump,
                      partitionStatsDumper);
 }
 
 static NEVER_INLINE void partitionsOutOfMemoryUsing2G() {
   size_t signature = 2UL * 1024 * 1024 * 1024;
   base::debug::Alias(&signature);
   OOM_CRASH();
@@ skipping 66 matching lines @@
   if (totalUsage >= 64 * 1024 * 1024)
     partitionsOutOfMemoryUsing64M();
   if (totalUsage >= 32 * 1024 * 1024)
     partitionsOutOfMemoryUsing32M();
   if (totalUsage >= 16 * 1024 * 1024)
     partitionsOutOfMemoryUsing16M();
   partitionsOutOfMemoryUsingLessThan16M();
 }
 
 }  // namespace WTF