Low memory page navigation GC for low end devices

third_party/WebKit/Source/platform/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 99 matching lines @@
   PartitionDumpStatsGeneric(FastMallocPartition(), "fast_malloc", is_light_dump,
                             partition_stats_dumper);
   PartitionDumpStatsGeneric(ArrayBufferPartition(), "array_buffer",
                             is_light_dump, partition_stats_dumper);
   PartitionDumpStatsGeneric(BufferPartition(), "buffer", is_light_dump,
                             partition_stats_dumper);
   PartitionDumpStats(LayoutPartition(), "layout", is_light_dump,
                      partition_stats_dumper);
 }
 
+namespace {
+
+class LightPartitionStatsDumperImpl : public WTF::PartitionStatsDumper {
+ public:
+  LightPartitionStatsDumperImpl() : total_active_bytes_(0) {}
+
+  void PartitionDumpTotals(
+      const char* partition_name,
+      const WTF::PartitionMemoryStats* memory_stats) override {
+    total_active_bytes_ += memory_stats->total_active_bytes;
+  }
+
+  void PartitionsDumpBucketStats(
+      const char* partition_name,
+      const WTF::PartitionBucketMemoryStats*) override {}
+
+  size_t TotalActiveBytes() const { return total_active_bytes_; }
+
+ private:
+  size_t total_active_bytes_;
+};
+
+}  // namespace
+
+size_t Partitions::TotalActiveBytes() {
+  LightPartitionStatsDumperImpl dumper;
+  WTF::Partitions::DumpMemoryStats(true, &dumper);
+  return dumper.TotalActiveBytes();
+}
+
 static NEVER_INLINE void PartitionsOutOfMemoryUsing2G() {
   size_t signature = 2UL * 1024 * 1024 * 1024;
   base::debug::Alias(&signature);
   OOM_CRASH();
 }
 
 static NEVER_INLINE void PartitionsOutOfMemoryUsing1G() {
   size_t signature = 1UL * 1024 * 1024 * 1024;
   base::debug::Alias(&signature);
   OOM_CRASH();
@@ skipping 60 matching lines @@
   if (total_usage >= 64 * 1024 * 1024)
     PartitionsOutOfMemoryUsing64M();
   if (total_usage >= 32 * 1024 * 1024)
     PartitionsOutOfMemoryUsing32M();
   if (total_usage >= 16 * 1024 * 1024)
     PartitionsOutOfMemoryUsing16M();
   PartitionsOutOfMemoryUsingLessThan16M();
 }
 
 }  // namespace WTF