1 // Copyright 2013 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/scheduler/rolling_time_delta_history.h"
11 RollingTimeDeltaHistory::RollingTimeDeltaHistory(size_t max_size)
12 : max_size_(max_size) {
15 RollingTimeDeltaHistory::~RollingTimeDeltaHistory() {
18 void RollingTimeDeltaHistory::InsertSample(base::TimeDelta time) {
22 if (sample_set_.size() == max_size_) {
23 sample_set_.erase(chronological_sample_deque_.front());
24 chronological_sample_deque_.pop_front();
27 TimeDeltaMultiset::iterator it = sample_set_.insert(time);
28 chronological_sample_deque_.push_back(it);
31 void RollingTimeDeltaHistory::Clear() {
32 chronological_sample_deque_.clear();
36 base::TimeDelta RollingTimeDeltaHistory::Percentile(double percent) const {
37 if (sample_set_.size() == 0)
38 return base::TimeDelta();
40 double fraction = percent / 100.0;
43 return *(sample_set_.begin());
46 return *(sample_set_.rbegin());
48 size_t num_smaller_samples =
49 static_cast<size_t>(std::ceil(fraction * sample_set_.size())) - 1;
51 if (num_smaller_samples > sample_set_.size() / 2) {
52 size_t num_larger_samples = sample_set_.size() - num_smaller_samples - 1;
53 TimeDeltaMultiset::const_reverse_iterator it = sample_set_.rbegin();
54 for (size_t i = 0; i < num_larger_samples; i++)
59 TimeDeltaMultiset::const_iterator it = sample_set_.begin();
60 for (size_t i = 0; i < num_smaller_samples; i++)