base/trace_event/trace_event_memory_overhead.h

   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 #ifndef BASE_TRACE_EVENT_TRACE_EVENT_MEMORY_OVERHEAD_H_
   6 #define BASE_TRACE_EVENT_TRACE_EVENT_MEMORY_OVERHEAD_H_
   7
   8 #include "base/base_export.h"
   9 #include "base/containers/hash_tables.h"
  10 #include "base/containers/small_map.h"
  11
  12 namespace base {
  13
  14 class RefCountedString;
  15 class Value;
  16
  17 namespace trace_event {
  18
  19 class ProcessMemoryDump;
  20
  21 // Used to estimate the memory overhead of the tracing infrastructure.
  22 class BASE_EXPORT TraceEventMemoryOverhead {
  23  public:
  24   TraceEventMemoryOverhead();
  25   ~TraceEventMemoryOverhead();
  26
  27   void Add(const char* object_type, size_t size_in_bytes);
  28   void AddString(const std::string& str);
  29   void AddValue(const Value& value);
  30   void AddRefCountedString(const RefCountedString& str);
  31
  32   // Call this after all the Add* methods above to account the memory used by
  33   // this TraceEventMemoryOverhead instance itself.
  34   void AddSelf();
  35
  36   // Adds up and merges all the values from |other| to this instance.
  37   void Update(const TraceEventMemoryOverhead& other);
  38
  39   void DumpInto(const char* base_name, ProcessMemoryDump* pmd) const;
  40
  41  private:
  42   struct ObjectCountAndSize {
  43     size_t count;
  44     size_t size_in_bytes;
  45   };
  46 #define TRACE_EVENT_MEMORY_OVERHEAD_MAP_SIZE 16
  47   using map_type = SmallMap<hash_map<const char*, ObjectCountAndSize>,
  48                             TRACE_EVENT_MEMORY_OVERHEAD_MAP_SIZE>;
  49   map_type allocated_objects_;
  50
  51   void AddOrCreateInternal(const char* object_type,
  52                            size_t count,
  53                            size_t size_in_bytes);
  54
  55   DISALLOW_COPY_AND_ASSIGN(TraceEventMemoryOverhead);
  56 };
  57
  58 }  // namespace trace_event
  59 }  // namespace base
  60
  61 #endif  // BASE_TRACE_EVENT_TRACE_EVENT_MEMORY_OVERHEAD_H_