1 /*
2  * Copyright (C) 2020 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 #ifndef SRC_PROFILING_MEMORY_LOG_HISTOGRAM_H_
18 #define SRC_PROFILING_MEMORY_LOG_HISTOGRAM_H_
19 
20 #include <inttypes.h>
21 #include <stddef.h>
22 
23 #include <array>
24 #include <utility>
25 #include <vector>
26 
27 namespace perfetto {
28 namespace profiling {
29 
30 class LogHistogram {
31  public:
32   static const uint64_t kMaxBucket;
33   static constexpr size_t kBuckets = 20;
34 
Add(uint64_t value)35   void Add(uint64_t value) { values_[GetBucket(value)]++; }
36   std::vector<std::pair<uint64_t, uint64_t>> GetData() const;
37 
38  private:
39   size_t GetBucket(uint64_t value);
40 
41   std::array<uint64_t, kBuckets> values_ = {};
42 };
43 
44 }  // namespace profiling
45 }  // namespace perfetto
46 
47 #endif  // SRC_PROFILING_MEMORY_LOG_HISTOGRAM_H_
48