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      1 /*
      2  * Copyright (C) 2017 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 #define LOG_TAG "ReportPerformance"
     18 
     19 #include <fstream>
     20 #include <iostream>
     21 #include <queue>
     22 #include <stdarg.h>
     23 #include <stdint.h>
     24 #include <stdio.h>
     25 #include <string.h>
     26 #include <sys/prctl.h>
     27 #include <utility>
     28 #include <media/nbaio/NBLog.h>
     29 #include <media/nbaio/PerformanceAnalysis.h>
     30 #include <media/nbaio/ReportPerformance.h>
     31 // #include <utils/CallStack.h> // used to print callstack
     32 #include <utils/Log.h>
     33 #include <utils/String8.h>
     34 
     35 namespace android {
     36 
     37 namespace ReportPerformance {
     38 
     39 // Writes outlier intervals, timestamps, and histograms spanning long time intervals to a file.
     40 // TODO: format the data efficiently and write different types of data to different files
     41 void writeToFile(std::deque<std::pair<outlierInterval, timestamp>> &outlierData,
     42                                     std::deque<std::pair<timestamp, Histogram>> &hists,
     43                                     const char * kName,
     44                                     bool append) {
     45     ALOGD("writing performance data to file");
     46     if (outlierData.empty() || hists.empty()) {
     47         return;
     48     }
     49 
     50     std::ofstream ofs;
     51     ofs.open(kName, append ? std::ios::app : std::ios::trunc);
     52     if (!ofs.is_open()) {
     53         ALOGW("couldn't open file %s", kName);
     54         return;
     55     }
     56     ofs << "Outlier data: interval and timestamp\n";
     57     for (const auto &outlier : outlierData) {
     58         ofs << outlier.first << ": " << outlier.second << "\n";
     59     }
     60     ofs << "Histogram data\n";
     61     for (const auto &hist : hists) {
     62         ofs << "\ttimestamp\n";
     63         ofs << hist.first << "\n";
     64         ofs << "\tbuckets and counts\n";
     65         for (const auto &bucket : hist.second) {
     66             ofs << bucket.first << ": " << bucket.second << "\n";
     67         }
     68     }
     69     ofs.close();
     70 }
     71 
     72 } // namespace ReportPerformance
     73 
     74 }   // namespace android
     75