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 #ifndef CAR_PROCESS_MONITOR_H_
17 #define CAR_PROCESS_MONITOR_H_
18 
19 #include <map>
20 #include <memory>
21 #include <set>
22 #include <string>
23 #include <shared_mutex>
24 
25 #include <inttypes.h>
26 #include <cutils/compiler.h>
27 
28 #include <binder/BinderService.h>
29 #include <binder/IBinder.h>
30 #include <utils/String8.h>
31 
32 #include <IVehicleMonitor.h>
33 #include <HandlerThread.h>
34 
35 namespace android {
36 
37 // ----------------------------------------------------------------------------
38 struct ProcInfo {
39     pid_t pid;
40     uid_t uid;
41     std::string name;
42     uint64_t utime;
43     uint64_t stime;
44     uint64_t rss;
45     uint64_t wbytes;
46     int64_t delta_utime;
47     int64_t delta_stime;
48     int64_t delta_time;
49     int64_t delta_rss;
50     int64_t delta_wbytes;
51 };
52 
53 // ----------------------------------------------------------------------------
54 
55 // This class is used to collect information about running processes.
56 // It also enforces certain policies to running apps - ex. kills non-system,
57 // non-foreground applications that use too much memory, CPU, or write too much
58 // data to disk.
59 class ProcessMonitor {
60 public:
61     ProcessMonitor();
62     ~ProcessMonitor();
63 
64     void dump(String8& msg);
65     status_t setAppPriority(uint32_t pid, uint32_t uid, uint32_t priority);
66     status_t process();
67 
68 private:
69     status_t updateProcessInfo();
70     void populateExistingPids(std::set<pid_t>& pidSet);
71     void deleteOutdatedPids(std::set<pid_t>& pidSet);
72     void updateOrAddProcess(pid_t pid);
73     void readStat(std::shared_ptr<ProcInfo> pidData, pid_t pid);
74     void readIo(std::shared_ptr<ProcInfo> pidData, pid_t pid);
75     void readCmdline(std::shared_ptr<ProcInfo> pidData, pid_t pid);
76     void readStatus(std::shared_ptr<ProcInfo> pidData, pid_t pid);
77     void updateDiffs(std::shared_ptr<ProcInfo> pidData,
78                      std::shared_ptr<ProcInfo> oldPidData);
79     status_t improveSystemHealth();
80     void dumpTopProcesses(String8& msg,
81         bool (*procCmpFn) (
82                 const std::pair<pid_t, const std::shared_ptr<ProcInfo>>,
83                 const std::pair<pid_t, const std::shared_ptr<ProcInfo>>));
84 
85 
86 private:
87     std::map<pid_t, std::shared_ptr<ProcInfo>> mProcInfoMap;
88     bool mIoSupported;
89     mutable std::shared_timed_mutex mMutex;
90 };
91 
92 }
93 
94 #endif /* CAR_PROCESS_MONITOR_H_ */
95