1 /*
2  * Copyright 2013 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 __MEMTRACK_H__
18 #define __MEMTRACK_H__
19 
20 #include <sys/types.h>
21 
22 #include <map>
23 #include <string>
24 #include <vector>
25 
26 #define DEFAULT_SLEEP_DELAY_SECONDS 5
27 #define NS_PER_SEC 1000000000LL
28 
29 class FileData {
30 public:
31   FileData(char *filename, char *buffer, size_t buffer_len);
32   ~FileData();
33 
34   // Get the PSS information from the file data. If there are no more
35   // PSS values to be found, return false.
36   bool getPss(size_t *pss);
37 
38   // Check if there is at least bytes available in the file data.
39   bool isAvail(size_t bytes);
40 
41 private:
42   int fd_;
43   char *data_;
44   size_t max_;
45   size_t cur_idx_;
46   size_t len_;
47   bool read_complete_;
48 };
49 
50 typedef struct {
51   std::string name;
52 
53   size_t max_num_pids;
54 
55   size_t num_samples;
56   double avg_pss_kb;
57   size_t min_pss_kb;
58   size_t max_pss_kb;
59   size_t last_pss_kb;
60 
61   std::vector<int> pids;
62 } process_info_t;
63 typedef std::map<std::string, process_info_t> processes_t;
64 
65 typedef struct {
66   size_t pss_kb;
67 
68   std::vector<int> pids;
69 } cur_process_info_t;
70 typedef std::map<std::string, cur_process_info_t> cur_processes_t;
71 
72 class ProcessInfo {
73 public:
74   ProcessInfo();
75   ~ProcessInfo();
76 
77   // Get the information about a single process.
78   bool getInformation(int pid, char *pid_str, size_t pid_str_len);
79 
80   // Scan all of the running processes.
81   void scan();
82 
83   // Dump the information about all of the processes in the system to the log.
84   void dumpToLog();
85 
86 private:
87   static const size_t kBufferLen = 4096;
88   static const size_t kCmdNameLen = 1024;
89 
90   static const char *kProc;
91   static const size_t kProcLen = 6;
92 
93   static const char *kCmdline;
94   static const size_t kCmdlineLen = 9;  // Includes \0 at end of string.
95 
96   static const char *kSmaps;
97   static const size_t kSmapsLen = 7;  // Includes \0 at end of string.
98 
99   static const char *kStatus;
100   static const size_t kStatusLen = 8;  // Includes \0 at end of string.
101 
102   static const size_t kInitialEntries = 1000;
103 
104   char proc_file_[PATH_MAX];
105   char buffer_[kBufferLen];
106 
107   char cmd_name_[kCmdNameLen];
108 
109   // Minimize a need for a lot of allocations by keeping our maps and
110   // lists in this object.
111   processes_t all_;
112   cur_processes_t cur_;
113   std::vector<const process_info_t *> list_;
114 
115   // Compute a running average.
computeAvg(double * running_avg,size_t cur_avg,size_t num_samples)116   static inline void computeAvg(double *running_avg, size_t cur_avg,
117                                 size_t num_samples) {
118     *running_avg = (*running_avg/(num_samples+1))*num_samples
119                    + (double)cur_avg/(num_samples+1);
120   }
121 };
122 
123 #endif  // __MEMTRACK_H__
124