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 const char MallocDumpProvider::kAllocatedObjects[] = "malloc/allocated_objects";
  16
  17 // static
  18 MallocDumpProvider* MallocDumpProvider::GetInstance() {
  19   return Singleton<MallocDumpProvider,
  20                    LeakySingletonTraits<MallocDumpProvider>>::get();
  21 }
  22
  23 MallocDumpProvider::MallocDumpProvider() {
  24 }
  25
  26 MallocDumpProvider::~MallocDumpProvider() {
  27 }
  28
  29 // Called at trace dump point time. Creates a snapshot the memory counters for
  30 // the current process.
  31 bool MallocDumpProvider::OnMemoryDump(ProcessMemoryDump* pmd) {
  32   struct mallinfo info = mallinfo();
  33   DCHECK_GE(info.arena + info.hblkhd, info.uordblks);
  34
  35   // When the system allocator is implemented by tcmalloc, the total heap
  36   // size is given by |arena| and |hblkhd| is 0. In case of Android's jemalloc
  37   // |arena| is 0 and the outer pages size is reported by |hblkhd|. In case of
  38   // dlmalloc the total is given by |arena| + |hblkhd|.
  39   // For more details see link: http://goo.gl/fMR8lF.
  40   MemoryAllocatorDump* outer_dump = pmd->CreateAllocatorDump("malloc");
  41   outer_dump->AddScalar("heap_virtual_size",
  42                         MemoryAllocatorDump::kUnitsBytes,
  43                         info.arena + info.hblkhd);
  44
  45   // Total allocated space is given by |uordblks|.
  46   MemoryAllocatorDump* inner_dump = pmd->CreateAllocatorDump(kAllocatedObjects);
  47   inner_dump->AddScalar(MemoryAllocatorDump::kNameSize,
  48                         MemoryAllocatorDump::kUnitsBytes, info.uordblks);
  49
  50   return true;
  51 }
  52
  53 }  // namespace trace_event
  54 }  // namespace base