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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.
#include "base/trace_event/trace_event_memory_overhead.h"
#include <algorithm>
#include "base/memory/ref_counted_memory.h"
#include "base/strings/stringprintf.h"
#include "base/trace_event/memory_allocator_dump.h"
#include "base/trace_event/process_memory_dump.h"
#include "base/values.h"
namespace {
size_t RoundUp(size_t size, size_t alignment) {
return (size + alignment - 1) & ~(alignment - 1);
}
} // namespace
namespace base {
namespace trace_event {
TraceEventMemoryOverhead::TraceEventMemoryOverhead() {
}
TraceEventMemoryOverhead::~TraceEventMemoryOverhead() {
}
void TraceEventMemoryOverhead::AddOrCreateInternal(
const char* object_type,
size_t count,
size_t allocated_size_in_bytes,
size_t resident_size_in_bytes) {
auto it = allocated_objects_.find(object_type);
if (it == allocated_objects_.end()) {
allocated_objects_.insert(std::make_pair(
object_type,
ObjectCountAndSize(
{count, allocated_size_in_bytes, resident_size_in_bytes})));
return;
}
it->second.count += count;
it->second.allocated_size_in_bytes += allocated_size_in_bytes;
it->second.resident_size_in_bytes += resident_size_in_bytes;
}
void TraceEventMemoryOverhead::Add(const char* object_type,
size_t allocated_size_in_bytes) {
Add(object_type, allocated_size_in_bytes, allocated_size_in_bytes);
}
void TraceEventMemoryOverhead::Add(const char* object_type,
size_t allocated_size_in_bytes,
size_t resident_size_in_bytes) {
AddOrCreateInternal(object_type, 1, allocated_size_in_bytes,
resident_size_in_bytes);
}
void TraceEventMemoryOverhead::AddString(const std::string& str) {
// The number below are empirical and mainly based on profiling of real-world
// std::string implementations:
// - even short string end up malloc()-inc at least 32 bytes.
// - longer stings seem to malloc() multiples of 16 bytes.
Add("std::string",
sizeof(std::string) + std::max<size_t>(RoundUp(str.capacity(), 16), 32u));
}
void TraceEventMemoryOverhead::AddRefCountedString(
const RefCountedString& str) {
Add("RefCountedString", sizeof(RefCountedString));
AddString(str.data());
}
void TraceEventMemoryOverhead::AddValue(const Value& value) {
switch (value.GetType()) {
case Value::TYPE_NULL:
case Value::TYPE_BOOLEAN:
case Value::TYPE_INTEGER:
case Value::TYPE_DOUBLE:
Add("FundamentalValue", sizeof(Value));
break;
case Value::TYPE_STRING: {
const StringValue* string_value = nullptr;
value.GetAsString(&string_value);
Add("StringValue", sizeof(StringValue));
AddString(string_value->GetString());
} break;
case Value::TYPE_BINARY: {
const BinaryValue* binary_value = nullptr;
value.GetAsBinary(&binary_value);
Add("BinaryValue", sizeof(BinaryValue) + binary_value->GetSize());
} break;
case Value::TYPE_DICTIONARY: {
const DictionaryValue* dictionary_value = nullptr;
value.GetAsDictionary(&dictionary_value);
Add("DictionaryValue", sizeof(DictionaryValue));
for (DictionaryValue::Iterator it(*dictionary_value); !it.IsAtEnd();
it.Advance()) {
AddString(it.key());
AddValue(it.value());
}
} break;
case Value::TYPE_LIST: {
const ListValue* list_value = nullptr;
value.GetAsList(&list_value);
Add("ListValue", sizeof(ListValue));
for (const Value* v : *list_value)
AddValue(*v);
} break;
default:
NOTREACHED();
}
}
void TraceEventMemoryOverhead::AddSelf() {
size_t estimated_size = sizeof(*this);
// If the SmallMap did overflow its static capacity, its elements will be
// allocated on the heap and have to be accounted separately.
if (allocated_objects_.UsingFullMap())
estimated_size += sizeof(map_type::value_type) * allocated_objects_.size();
Add("TraceEventMemoryOverhead", estimated_size);
}
void TraceEventMemoryOverhead::Update(const TraceEventMemoryOverhead& other) {
for (const auto& it : other.allocated_objects_) {
AddOrCreateInternal(it.first, it.second.count,
it.second.allocated_size_in_bytes,
it.second.resident_size_in_bytes);
}
}
void TraceEventMemoryOverhead::DumpInto(const char* base_name,
ProcessMemoryDump* pmd) const {
for (const auto& it : allocated_objects_) {
std::string dump_name = StringPrintf("%s/%s", base_name, it.first);
MemoryAllocatorDump* mad = pmd->CreateAllocatorDump(dump_name);
mad->AddScalar(MemoryAllocatorDump::kNameSize,
MemoryAllocatorDump::kUnitsBytes,
it.second.allocated_size_in_bytes);
mad->AddScalar("resident_size", MemoryAllocatorDump::kUnitsBytes,
it.second.resident_size_in_bytes);
mad->AddScalar(MemoryAllocatorDump::kNameObjectsCount,
MemoryAllocatorDump::kUnitsObjects, it.second.count);
}
}
} // namespace trace_event
} // namespace base
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