base/trace_event/java_heap_dump_provider_android.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/trace_event/java_heap_dump_provider_android.h"
   6
   7 #include "base/android/java_runtime.h"
   8 #include "base/trace_event/process_memory_dump.h"
   9
  10 namespace base {
  11 namespace trace_event {
  12
  13 // static
  14 JavaHeapDumpProvider* JavaHeapDumpProvider::GetInstance() {
  15   return Singleton<JavaHeapDumpProvider,
  16                    LeakySingletonTraits<JavaHeapDumpProvider>>::get();
  17 }
  18
  19 JavaHeapDumpProvider::JavaHeapDumpProvider() {
  20 }
  21
  22 JavaHeapDumpProvider::~JavaHeapDumpProvider() {
  23 }
  24
  25 // Called at trace dump point time. Creates a snapshot with the memory counters
  26 // for the current process.
  27 bool JavaHeapDumpProvider::OnMemoryDump(const MemoryDumpArgs& args,
  28                                         ProcessMemoryDump* pmd) {
  29   // These numbers come from java.lang.Runtime stats.
  30   long total_heap_size = 0;
  31   long free_heap_size = 0;
  32   android::JavaRuntime::GetMemoryUsage(&total_heap_size, &free_heap_size);
  33
  34   MemoryAllocatorDump* outer_dump = pmd->CreateAllocatorDump("java_heap");
  35   outer_dump->AddScalar(MemoryAllocatorDump::kNameSize,
  36                         MemoryAllocatorDump::kUnitsBytes, total_heap_size);
  37
  38   MemoryAllocatorDump* inner_dump =
  39       pmd->CreateAllocatorDump("java_heap/allocated_objects");
  40   inner_dump->AddScalar(MemoryAllocatorDump::kNameSize,
  41                         MemoryAllocatorDump::kUnitsBytes,
  42                         total_heap_size - free_heap_size);
  43   return true;
  44 }
  45
  46 }  // namespace trace_event
  47 }  // namespace base