1 /* 2 * Copyright 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #pragma once 18 19 #include "tuningfork_internal.h" 20 21 #include <inttypes.h> 22 #include <vector> 23 #include <string> 24 25 namespace tuningfork { 26 27 class Histogram { 28 typedef double Sample; 29 static constexpr int kAutoSizeNumStdDev = 3; 30 static constexpr double kAutoSizeMinBucketSizeMs = 0.1; 31 Sample start_ms_, end_ms_, bucket_dt_ms_; 32 uint32_t num_buckets_; 33 std::vector<uint32_t> buckets_; 34 std::vector<Sample> samples_; 35 bool auto_range_; 36 size_t count_; 37 public: 38 static constexpr int kDefaultNumBuckets = 30; 39 40 explicit Histogram(float start_ms = 0, float end_ms = 0, int num_buckets_between = kDefaultNumBuckets); 41 explicit Histogram(const Settings::Histogram&); 42 43 // Add a sample delta time 44 void Add(Sample dt_ms); 45 46 // Reset the histogram 47 void Clear(bool autorange = false); 48 49 // Get the total number of samples added so far 50 size_t Count() const { return count_; } 51 52 // Get the histogram as a JSON object, for testing 53 std::string ToJSON() const; 54 55 // Use the data we have to construct the bucket ranges. This is called automatically after 56 // sizeAtWhichToRange samples have been collected, if we are auto-ranging. 57 void CalcBucketsFromSamples(); 58 59 friend class ClearcutSerializer; 60 }; 61 62 } // namespace tuningfork { 63
