chromium/v8/src/heap/base/bytes.h

// Copyright 2023 the V8 project 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 V8_HEAP_BASE_BYTES_H_
#define V8_HEAP_BASE_BYTES_H_

#include <algorithm>
#include <cstddef>
#include <limits>
#include <optional>

#include "src/base/platform/time.h"
#include "src/base/ring-buffer.h"

namespace heap::base {

struct BytesAndDuration final { … };

using BytesAndDurationBuffer = v8::base::RingBuffer<BytesAndDuration>;

// Returns the average speed of events recorded in `buffer` including an
// `initial` event in Bytes/ms. If provided, `selected_duration` will bound the
// events considered (which uses the order of events in
// `BytesAndDurationBuffer`). The bounds are in Bytes/ms and can be used to
// bound non-zero speeds.
inline double AverageSpeed(
    const BytesAndDurationBuffer& buffer, const BytesAndDuration& initial,
    std::optional<v8::base::TimeDelta> selected_duration,
    size_t min_non_empty_speed = 0,
    size_t max_speed = std::numeric_limits<size_t>::max()) { … }

}  // namespace heap::base

#endif  // V8_HEAP_BASE_BYTES_H_