1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
7 #include "cc/base/rolling_time_delta_history.h"
11 RollingTimeDeltaHistory::RollingTimeDeltaHistory(size_t max_size)
12 : max_size_(max_size) {}
14 RollingTimeDeltaHistory::~RollingTimeDeltaHistory() {}
16 void RollingTimeDeltaHistory::InsertSample(base::TimeDelta time) {
20 if (sample_set_.size() == max_size_) {
21 sample_set_.erase(chronological_sample_deque_.front());
22 chronological_sample_deque_.pop_front();
25 TimeDeltaMultiset::iterator it = sample_set_.insert(time);
26 chronological_sample_deque_.push_back(it);
29 size_t RollingTimeDeltaHistory::SampleCount() {
30 return sample_set_.size();
33 void RollingTimeDeltaHistory::Clear() {
34 chronological_sample_deque_.clear();
38 base::TimeDelta RollingTimeDeltaHistory::Percentile(double percent) const {
39 if (sample_set_.size() == 0)
40 return base::TimeDelta();
42 double fraction = percent / 100.0;
45 return *(sample_set_.begin());
48 return *(sample_set_.rbegin());
50 size_t num_smaller_samples =
51 static_cast<size_t>(std::ceil(fraction * sample_set_.size())) - 1;
53 if (num_smaller_samples > sample_set_.size() / 2) {
54 size_t num_larger_samples = sample_set_.size() - num_smaller_samples - 1;
55 TimeDeltaMultiset::const_reverse_iterator it = sample_set_.rbegin();
56 for (size_t i = 0; i < num_larger_samples; i++)
61 TimeDeltaMultiset::const_iterator it = sample_set_.begin();
62 for (size_t i = 0; i < num_smaller_samples; i++)