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 namespace {
  15
  16 const char kDumperFriendlyName[] = "Malloc";
  17 const char kDumperName[] = "malloc";
  18
  19 }  // namespace
  20
  21 // static
  22 MallocDumpProvider* MallocDumpProvider::GetInstance() {
  23   return Singleton<MallocDumpProvider,
  24                    LeakySingletonTraits<MallocDumpProvider>>::get();
  25 }
  26
  27 MallocDumpProvider::MallocDumpProvider() {
  28 }
  29
  30 MallocDumpProvider::~MallocDumpProvider() {
  31 }
  32
  33 // Called at trace dump point time. Creates a snapshot the memory counters for
  34 // the current process.
  35 bool MallocDumpProvider::DumpInto(ProcessMemoryDump* pmd) {
  36   struct mallinfo info = mallinfo();
  37   DCHECK(info.uordblks > 0);
  38   DCHECK_GE(info.arena + info.hblkhd, info.uordblks);
  39
  40   MemoryAllocatorDump* dump = pmd->CreateAllocatorDump(kDumperName);
  41   if (!dump)
  42     return false;
  43
  44   // When the system allocator is implemented by tcmalloc, the total physical
  45   // size is given by |arena| and |hblkhd| is 0. In case of Android's jemalloc
  46   // |arena| is 0 and the outer pages size is reported by |hblkhd|. In case of
  47   // dlmalloc the total is given by |arena| + |hblkhd|.
  48   // For more details see link: http://goo.gl/fMR8lF.
  49   dump->set_physical_size_in_bytes(info.arena + info.hblkhd);
  50
  51   // mallinfo doesn't support any allocated object count.
  52   dump->set_allocated_objects_count(0);
  53
  54   // Total allocated space is given by |uordblks|.
  55   dump->set_allocated_objects_size_in_bytes(info.uordblks);
  56
  57   return true;
  58 }
  59
  60 const char* MallocDumpProvider::GetFriendlyName() const {
  61   return kDumperFriendlyName;
  62 }
  63
  64 }  // namespace trace_event
  65 }  // namespace base