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      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.
    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