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// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "tools/memory/simulator/memory_simulator.h"
#include <cstdint>
#include "base/check.h"
#include "base/debug/alias.h"
#include "base/logging.h"
#include "base/memory/page_size.h"
#include "base/time/time.h"
#include "tools/memory/simulator/contiguous_memory_holder.h"
namespace memory_simulator {
MemorySimulator::MemorySimulator() = default;
MemorySimulator::~MemorySimulator() = default;
void MemorySimulator::Start(int64_t page_alloc_per_sec,
int64_t page_read_per_sec,
int64_t page_write_per_sec,
int64_t max_pages_allocated,
base::TimeTicks read_deadline,
base::TimeTicks write_deadline) {
memory_holder_ =
std::make_unique<ContiguousMemoryHolder>(max_pages_allocated);
max_pages_allocated_ = max_pages_allocated;
if (page_alloc_per_sec != 0) {
alloc_timer_.Start(FROM_HERE, base::Hertz(page_alloc_per_sec), this,
&MemorySimulator::Allocate);
}
if (page_read_per_sec != 0) {
read_timer_.Start(FROM_HERE, base::Hertz(page_read_per_sec), this,
&MemorySimulator::Read);
read_deadline_ = read_deadline;
}
if (page_write_per_sec != 0) {
write_timer_.Start(FROM_HERE, base::Hertz(page_write_per_sec), this,
&MemorySimulator::Write);
write_deadline_ = write_deadline;
}
}
void MemorySimulator::StopAndFree() {
memory_holder_.reset();
alloc_timer_.Stop();
read_timer_.Stop();
write_timer_.Stop();
pages_allocated_ = 0;
}
int64_t MemorySimulator::GetPagesAllocated() const {
return pages_allocated_;
}
int64_t MemorySimulator::GetPagesRead() const {
return pages_read_;
}
int64_t MemorySimulator::GetPagesWritten() const {
return pages_written_;
}
void MemorySimulator::Allocate() {
CHECK_LE(pages_allocated_, max_pages_allocated_);
if (pages_allocated_ == max_pages_allocated_) {
alloc_timer_.Stop();
return;
}
memory_holder_->Allocate();
++pages_allocated_;
}
void MemorySimulator::Read() {
if (base::TimeTicks::Now() >= read_deadline_) {
read_timer_.Stop();
return;
}
if (pages_allocated_ == 0) {
return;
}
memory_holder_->Read();
++pages_read_;
}
void MemorySimulator::Write() {
if (base::TimeTicks::Now() >= write_deadline_) {
write_timer_.Stop();
return;
}
if (pages_allocated_ == 0) {
return;
}
memory_holder_->Write();
++pages_written_;
}
} // namespace memory_simulator
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