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kernel
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sched
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autogroup.h

autogroup.h 1.5 KB
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  1. /* SPDX-License-Identifier: GPL-2.0 */
    2. 

  2. #ifdef CONFIG_SCHED_AUTOGROUP
    3. 

  3. 

  4. #include <linux/kref.h>
    5. 

  5. #include <linux/rwsem.h>
    6. 

  6. #include <linux/sched/autogroup.h>
    7. 

  7. 

  8. struct autogroup {
    9. 

  9. 	/*
    10. 

  10. 	 * reference doesn't mean how many thread attach to this
    11. 

  11. 	 * autogroup now. It just stands for the number of task
    12. 

  12. 	 * could use this autogroup.
    13. 

  13. 	 */
    14. 

  14. 	struct kref		kref;
    15. 

  15. 	struct task_group	*tg;
    16. 

  16. 	struct rw_semaphore	lock;
    17. 

  17. 	unsigned long		id;
    18. 

  18. 	int			nice;
    19. 

  19. };
    20. 

  20. 

  21. extern void autogroup_init(struct task_struct *init_task);
    22. 

  22. extern void autogroup_free(struct task_group *tg);
    23. 

  23. 

  24. static inline bool task_group_is_autogroup(struct task_group *tg)
    25. 

  25. {
    26. 

  26. 	return !!tg->autogroup;
    27. 

  27. }
    28. 

  28. 

  29. extern bool task_wants_autogroup(struct task_struct *p, struct task_group *tg);
    30. 

  30. 

  31. static inline struct task_group *
    32. 

  32. autogroup_task_group(struct task_struct *p, struct task_group *tg)
    33. 

  33. {
    34. 

  34. 	int enabled = READ_ONCE(sysctl_sched_autogroup_enabled);
    35. 

  35. 

  36. 	if (enabled && task_wants_autogroup(p, tg))
    37. 

  37. 		return p->signal->autogroup->tg;
    38. 

  38. 

  39. 	return tg;
    40. 

  40. }
    41. 

  41. 

  42. extern int autogroup_path(struct task_group *tg, char *buf, int buflen);
    43. 

  43. 

  44. #else /* !CONFIG_SCHED_AUTOGROUP */
    45. 

  45. 

  46. static inline void autogroup_init(struct task_struct *init_task) {  }
    47. 

  47. static inline void autogroup_free(struct task_group *tg) { }
    48. 

  48. static inline bool task_group_is_autogroup(struct task_group *tg)
    49. 

  49. {
    50. 

  50. 	return 0;
    51. 

  51. }
    52. 

  52. 

  53. static inline struct task_group *
    54. 

  54. autogroup_task_group(struct task_struct *p, struct task_group *tg)
    55. 

  55. {
    56. 

  56. 	return tg;
    57. 

  57. }
    58. 

  58. 

  59. static inline int autogroup_path(struct task_group *tg, char *buf, int buflen)
    60. 

  60. {
    61. 

  61. 	return 0;
    62. 

  62. }
    63. 

  63. 

  64. #endif /* CONFIG_SCHED_AUTOGROUP */
    65. 

  65.