Alex Vakulenko | e4eec20 | 2017-01-27 14:41:04 -0800 | [diff] [blame^] | 1 | #ifndef ANDROID_DVR_PERFORMANCED_TASK_H_ |
| 2 | #define ANDROID_DVR_PERFORMANCED_TASK_H_ |
| 3 | |
| 4 | #include <sys/types.h> |
| 5 | |
| 6 | #include <array> |
| 7 | #include <cstdio> |
| 8 | #include <memory> |
| 9 | #include <string> |
| 10 | #include <unordered_map> |
| 11 | #include <vector> |
| 12 | |
| 13 | #include <android-base/unique_fd.h> |
| 14 | |
| 15 | #include "unique_file.h" |
| 16 | |
| 17 | namespace android { |
| 18 | namespace dvr { |
| 19 | |
| 20 | // Task provides access to task-related information from the procfs |
| 21 | // pseudo-filesystem. |
| 22 | class Task { |
| 23 | public: |
| 24 | explicit Task(pid_t task_id); |
| 25 | |
| 26 | bool IsValid() const { return task_fd_.get() >= 0; } |
| 27 | explicit operator bool() const { return IsValid(); } |
| 28 | |
| 29 | pid_t task_id() const { return task_id_; } |
| 30 | std::string name() const { return name_; } |
| 31 | pid_t thread_group_id() const { return thread_group_id_; } |
| 32 | pid_t parent_process_id() const { return parent_process_id_; } |
| 33 | size_t thread_count() const { return thread_count_; } |
| 34 | uint32_t cpus_allowed_mask() const { return cpus_allowed_mask_; } |
| 35 | const std::string& cpus_allowed_list() const { return cpus_allowed_list_; } |
| 36 | const std::array<int, 4>& user_id() const { return user_id_; } |
| 37 | const std::array<int, 4>& group_id() const { return group_id_; } |
| 38 | |
| 39 | // Indices into user and group id arrays. |
| 40 | enum { |
| 41 | kUidReal = 0, |
| 42 | kUidEffective, |
| 43 | kUidSavedSet, |
| 44 | kUidFilesystem, |
| 45 | }; |
| 46 | |
| 47 | std::string GetCpuSetPath() const; |
| 48 | |
| 49 | private: |
| 50 | pid_t task_id_; |
| 51 | base::unique_fd task_fd_; |
| 52 | |
| 53 | // Fields read from /proc/<task_id_>/status. |
| 54 | std::string name_; |
| 55 | pid_t thread_group_id_; |
| 56 | pid_t parent_process_id_; |
| 57 | std::array<int, 4> user_id_; |
| 58 | std::array<int, 4> group_id_; |
| 59 | size_t thread_count_; |
| 60 | uint32_t cpus_allowed_mask_; |
| 61 | std::string cpus_allowed_list_; |
| 62 | |
| 63 | // Opens the file /proc/<task_id_>/|name| and returns the open file |
| 64 | // descriptor. |
| 65 | base::unique_fd OpenTaskFile(const std::string& name) const; |
| 66 | |
| 67 | // Similar to OpenTaskFile() but returns a file pointer. |
| 68 | UniqueFile OpenTaskFilePointer(const std::string& name) const; |
| 69 | |
| 70 | // Reads the field named |field| from /proc/<task_id_>/status. |
| 71 | std::string GetStatusField(const std::string& field) const; |
| 72 | |
| 73 | // Reads a subset of the fields in /proc/<task_id_>/status. |
| 74 | void ReadStatusFields(); |
| 75 | |
| 76 | Task(const Task&) = delete; |
| 77 | void operator=(const Task&) = delete; |
| 78 | }; |
| 79 | |
| 80 | } // namespace dvr |
| 81 | } // namespace android |
| 82 | |
| 83 | #endif // ANDROID_DVR_PERFORMANCED_TASK_H_ |