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// 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 "src/base/optional.h"
#include "src/base/platform/time.h"
#include "src/base/ring-buffer.h"
namespace heap::base {
struct BytesAndDuration final {
constexpr BytesAndDuration() = default;
constexpr BytesAndDuration(size_t bytes, v8::base::TimeDelta duration)
: bytes(bytes), duration(duration) {}
size_t bytes = 0;
v8::base::TimeDelta duration;
};
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,
v8::base::Optional<v8::base::TimeDelta> selected_duration,
size_t min_non_empty_speed = 0,
size_t max_speed = std::numeric_limits<size_t>::max()) {
const BytesAndDuration sum = buffer.Reduce(
[selected_duration](const BytesAndDuration& a,
const BytesAndDuration& b) {
if (selected_duration.has_value() &&
a.duration >= selected_duration.value()) {
return a;
}
return BytesAndDuration(a.bytes + b.bytes, a.duration + b.duration);
},
initial);
const auto duration = sum.duration;
// TODO(v8:14140): The return value should really be an optional double to
// indicate no speed.
if (duration.IsZero()) {
return 0.0;
}
return std::max(
std::min(static_cast<double>(sum.bytes) / duration.InMillisecondsF(),
static_cast<double>(max_speed)),
static_cast<double>(min_non_empty_speed));
}
} // namespace heap::base
#endif // V8_HEAP_BASE_BYTES_H_
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