Home | History | Annotate | Download | only in include 
      1 /*
      2  * Copyright (C) 2016 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 _STORAGED_UID_MONITOR_H_
     18 #define _STORAGED_UID_MONITOR_H_
     19 
     20 #include <stdint.h>
     21 
     22 #include <string>
     23 #include <unordered_map>
     24 #include <vector>
     25 
     26 enum uid_stat_t {
     27     FOREGROUND = 0,
     28     BACKGROUND = 1,
     29     UID_STATS = 2
     30 };
     31 
     32 enum charger_stat_t {
     33     CHARGER_OFF = 0,
     34     CHARGER_ON = 1,
     35     CHARGER_STATS = 2
     36 };
     37 
     38 enum io_type_t {
     39     READ = 0,
     40     WRITE = 1,
     41     IO_TYPES = 2
     42 };
     43 
     44 struct uid_io_stats {
     45     uint64_t rchar;                 // characters read
     46     uint64_t wchar;                 // characters written
     47     uint64_t read_bytes;            // bytes read (from storage layer)
     48     uint64_t write_bytes;           // bytes written (to storage layer)
     49     uint64_t fsync;                 // number of fsync syscalls
     50 };
     51 
     52 struct uid_info {
     53     uint32_t uid;                   // user id
     54     std::string name;               // package name
     55     struct uid_io_stats io[UID_STATS];    // [0]:foreground [1]:background
     56 };
     57 
     58 struct uid_io_usage {
     59     uint64_t bytes[IO_TYPES][UID_STATS][CHARGER_STATS];
     60 };
     61 
     62 struct uid_record {
     63     std::string name;
     64     struct uid_io_usage ios;
     65 };
     66 
     67 struct uid_records {
     68     uint64_t start_ts;
     69     std::vector<struct uid_record> entries;
     70 };
     71 
     72 class uid_monitor {
     73 private:
     74     // last dump from /proc/uid_io/stats, uid -> uid_info
     75     std::unordered_map<uint32_t, struct uid_info> last_uid_io_stats;
     76     // current io usage for next report, app name -> uid_io_usage
     77     std::unordered_map<std::string, struct uid_io_usage> curr_io_stats;
     78     // io usage records, end timestamp -> {start timestamp, vector of records}
     79     std::map<uint64_t, struct uid_records> records;
     80     // charger ON/OFF
     81     charger_stat_t charger_stat;
     82     // protects curr_io_stats, last_uid_io_stats, records and charger_stat
     83     sem_t um_lock;
     84     // start time for IO records
     85     uint64_t start_ts;
     86 
     87     // reads from /proc/uid_io/stats
     88     std::unordered_map<uint32_t, struct uid_info> get_uid_io_stats_locked();
     89     // flushes curr_io_stats to records
     90     void add_records_locked(uint64_t curr_ts);
     91     // updates curr_io_stats and set last_uid_io_stats
     92     void update_curr_io_stats_locked();
     93 
     94 public:
     95     uid_monitor();
     96     ~uid_monitor();
     97     // called by storaged main thread
     98     void init(charger_stat_t stat);
     99     // called by storaged -u
    100     std::unordered_map<uint32_t, struct uid_info> get_uid_io_stats();
    101     // called by dumpsys
    102     std::map<uint64_t, struct uid_records> dump(
    103         double hours, uint64_t threshold, bool force_report);
    104     // called by battery properties listener
    105     void set_charger_state(charger_stat_t stat);
    106     // called by storaged periodic_chore or dump with force_report
    107     void report();
    108 };
    109 
    110 #endif /* _STORAGED_UID_MONITOR_H_ */
    111