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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef BASE_TRACE_EVENT_TRACE_EVENT_MEMORY_OVERHEAD_H_
#define BASE_TRACE_EVENT_TRACE_EVENT_MEMORY_OVERHEAD_H_
#include "base/base_export.h"
#include "base/containers/hash_tables.h"
#include "base/containers/small_map.h"
namespace base {
class RefCountedString;
class Value;
namespace trace_event {
class ProcessMemoryDump;
// Used to estimate the memory overhead of the tracing infrastructure.
class BASE_EXPORT TraceEventMemoryOverhead {
public:
TraceEventMemoryOverhead();
~TraceEventMemoryOverhead();
// Use this method to account the overhead of an object for which an estimate
// is known for both the allocated and resident memory.
void Add(const char* object_type,
size_t allocated_size_in_bytes,
size_t resident_size_in_bytes);
// Similar to Add() above, but assumes that
// |resident_size_in_bytes| == |allocated_size_in_bytes|.
void Add(const char* object_type, size_t allocated_size_in_bytes);
// Specialized profiling functions for commonly used object types.
void AddString(const std::string& str);
void AddValue(const Value& value);
void AddRefCountedString(const RefCountedString& str);
// Call this after all the Add* methods above to account the memory used by
// this TraceEventMemoryOverhead instance itself.
void AddSelf();
// Adds up and merges all the values from |other| to this instance.
void Update(const TraceEventMemoryOverhead& other);
void DumpInto(const char* base_name, ProcessMemoryDump* pmd) const;
private:
struct ObjectCountAndSize {
size_t count;
size_t allocated_size_in_bytes;
size_t resident_size_in_bytes;
};
using map_type = SmallMap<hash_map<const char*, ObjectCountAndSize>, 16>;
map_type allocated_objects_;
void AddOrCreateInternal(const char* object_type,
size_t count,
size_t allocated_size_in_bytes,
size_t resident_size_in_bytes);
DISALLOW_COPY_AND_ASSIGN(TraceEventMemoryOverhead);
};
} // namespace trace_event
} // namespace base
#endif // BASE_TRACE_EVENT_TRACE_EVENT_MEMORY_OVERHEAD_H_
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