base/trace_event/malloc_dump_provider.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/malloc_dump_provider.h"
   6
   7 #include <malloc.h>
   8
   9 #include "base/trace_event/process_memory_dump.h"
  10
  11 namespace base {
  12 namespace trace_event {
  13
  14 // static
  15 MallocDumpProvider* MallocDumpProvider::GetInstance() {
  16   return Singleton<MallocDumpProvider,
  17                    LeakySingletonTraits<MallocDumpProvider>>::get();
  18 }
  19
  20 MallocDumpProvider::MallocDumpProvider() {
  21 }
  22
  23 MallocDumpProvider::~MallocDumpProvider() {
  24 }
  25
  26 // Called at trace dump point time. Creates a snapshot the memory counters for
  27 // the current process.
  28 bool MallocDumpProvider::OnMemoryDump(ProcessMemoryDump* pmd) {
  29   struct mallinfo info = mallinfo();
  30   DCHECK_GE(info.arena + info.hblkhd, info.uordblks);
  31
  32   MemoryAllocatorDump* dump = pmd->CreateAllocatorDump("malloc");
  33   if (!dump)
  34     return false;
  35
  36   // When the system allocator is implemented by tcmalloc, the total physical
  37   // size is given by |arena| and |hblkhd| is 0. In case of Android's jemalloc
  38   // |arena| is 0 and the outer pages size is reported by |hblkhd|. In case of
  39   // dlmalloc the total is given by |arena| + |hblkhd|.
  40   // For more details see link: http://goo.gl/fMR8lF.
  41   dump->AddScalar(MemoryAllocatorDump::kNameOuterSize,
  42                   MemoryAllocatorDump::kUnitsBytes, info.arena + info.hblkhd);
  43
  44   // Total allocated space is given by |uordblks|.
  45   dump->AddScalar(MemoryAllocatorDump::kNameInnerSize,
  46                   MemoryAllocatorDump::kUnitsBytes, info.uordblks);
  47
  48   return true;
  49 }
  50
  51 }  // namespace trace_event
  52 }  // namespace base