[Linux] Process (12)--TASK_STRUCT structure

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2. struct Task_struct {
4. volatile long state; /*-1 not operational, 0 can run, >0 means stop */
6. void *stack;
8. atomic_t usage;
10. unsigned long flags; /* per Process flag */
12. unsigned long ptrace;
14. int lock_depth; / * Large kernel lock depth * /
16. int Prio, Static_prio, Normal_prio;
18. struct List_head run_list;
20. const struct sched_class *sched_class;
22. struct sched_entity se;
24. unsigned short ioprio;
26. unsigned long policy;
28. cpumask_t cpus_allowed;
30. unsigned int time_slice;
32. #if defined (config_schedstats) | | Defined (CONFIG_TASK_DELAY_ACCT)
34. struct Sched_info sched_info;
36. #endif
38. struct list_head tasks;
40. /* 
42. * Ptrace_list/ptrace_children forms the list of my children
44. * That's were stolen by a ptracer.
46. */
48. struct List_head ptrace_children;
50. struct List_head ptrace_list;
52. struct mm_struct *mm, *active_mm;
54. /* Process Status */
56. struct LINUX_BINFMT *binfmt;
58. long exit_state;
60. int Exit_code, exit_signal;
62. int pdeath_signal; / * Signal sent at the end of the parent process * /
64. unsigned int personality;
66. unsigned did_exec:1;
68. pid_t pid;
70. pid_t Tgid;
72. struct task_struct *real_parent; /* Real parent process (in case of being debugged) */
74. struct task_struct *parent; /* Parental process, parent and real_parent differences: Real_parent is the father, the fork, the parent is the father, most of the time the father-in-God is a person, PS see is the father-in-god, when the father-in-the-fathers are not the same, For example, there is a situation, such as a father died, but also have a parent process, such as the 1th process will be treated as a parent process. But the process is not the number 1th fork out. */  
76. struct list_head children; / * Child process Chain list * /
78. struct list_head sibling; / * The linked list of child processes connected to the parent process * /
80. struct task_struct *group_leader; / * Thread Group leader * /
82. /* PID and PID hash list contact */
84. struct Pid_link Pids[pidtype_max];
86. struct List_head thread_group;
88. struct completion *vfork_done; /* for vfork () */
90. int __user *set_child_tid; / * Clone_child_settid * /
92. int __user *clear_child_tid; / * Clone_child_cleartid * /
94. unsigned long rt_priority;
96. cputime_t Utime, Stime, utimescaled, stimescaled;
98. Unsigned long NVCSW, NIVCSW; / * Context Switch Count * /
100. struct Timespec start_time; / * Monotone time * /
102. struct Timespec real_start_time; / * Time since startup * /
104. Unsigned long min_flt, Maj_flt;
106. cputime_t It_prof_expires, It_virt_expires;
108. Unsigned long long it_sched_expires;
110. struct List_head cpu_timers[3];
112. /* Process Identity credentials */
114. uid_t Uid,euid,suid,fsuid;
116. gid_t Gid,egid,sgid,fsgid;
118. struct Group_info *group_info;
120. kernel_cap_t cap_effective, cap_inheritable, cap_permitted;
122. unsigned keep_capabilities:1;
124. struct user_struct *user;
126. Char Comm[task_comm_len]; / * The name of the executable file after removing the path * /
128. /* File System Information */
130. int Link_count, total_link_count;
132. /* IPC Stuff */
134. struct Sysv_sem Sysvsem;
136. /* Current process-specific CPU information */
138. struct thread_struct thread;
140. /* FileSystem information */
142. struct fs_struct *fs;
144. /* Open File Information */
146. struct files_struct *files;
148. /* Namespace */
150. struct Nsproxy *nsproxy;
152. /* Signal handlers */
154. struct signal_struct *signal;
156. struct sighand_struct *sighand;
158. sigset_t blocked, real_blocked;
160. sigset_t Saved_sigmask; /* To is restored with tif_restore_sigmask * /
162. struct sigpending pending;
164. unsigned long sas_ss_sp;
166. size_t sas_ss_size;
168. Int (*notifier) (void *priv);
170. void *notifier_data;
172. sigset_t *notifier_mask;
174. #ifdef config_security
176. V OID *security;
178. #endif
180. /* Thread Group Tracking */
182. U32 parent_exec_id;
184. U32 self_exec_id;
186. /* Log File System Information */
188. void *journal_info;
190. /* Virtual Memory status */
192. struct reclaim_state *reclaim_state;
194. struct Backing_dev_info *backing_dev_info;
196. struct Io_context *io_context;
198. unsigned long ptrace_message;
200. siginfo_t *last_siginfo; / * for ptrace use. * /
202. ...
204. };

atomic_t usage; There are several processes that are using this structure

[Linux] Process (12)--TASK_STRUCT structure