include/linux/psi.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _LINUX_PSI_H
   3 #define _LINUX_PSI_H
   4
   5 #include <linux/jump_label.h>
   6 #include <linux/psi_types.h>
   7 #include <linux/sched.h>
   8 #include <linux/poll.h>
   9 #include <linux/cgroup-defs.h>
  10 #include <linux/cgroup.h>
  11
  12 struct seq_file;
  13 struct css_set;
  14
  15 #ifdef CONFIG_PSI
  16
  17 extern struct static_key_false psi_disabled;
  18 extern struct psi_group psi_system;
  19
  20 void psi_init(void);
  21
  22 void psi_memstall_enter(unsigned long *flags);
  23 void psi_memstall_leave(unsigned long *flags);
  24
  25 int psi_show(struct seq_file *s, struct psi_group *group, enum psi_res res);
  26 struct psi_trigger *psi_trigger_create(struct psi_group *group, char *buf,
  27                                        enum psi_res res, struct file *file,
  28                                        struct kernfs_open_file *of);
  29 void psi_trigger_destroy(struct psi_trigger *t);
  30
  31 __poll_t psi_trigger_poll(void **trigger_ptr, struct file *file,
  32                         poll_table *wait);
  33
  34 #ifdef CONFIG_CGROUPS
  35 static inline struct psi_group *cgroup_psi(struct cgroup *cgrp)
  36 {
  37         return cgroup_ino(cgrp) == 1 ? &psi_system : cgrp->psi;
  38 }
  39
  40 int psi_cgroup_alloc(struct cgroup *cgrp);
  41 void psi_cgroup_free(struct cgroup *cgrp);
  42 void cgroup_move_task(struct task_struct *p, struct css_set *to);
  43 void psi_cgroup_restart(struct psi_group *group);
  44 #endif
  45
  46 #else /* CONFIG_PSI */
  47
  48 static inline void psi_init(void) {}
  49
  50 static inline void psi_memstall_enter(unsigned long *flags) {}
  51 static inline void psi_memstall_leave(unsigned long *flags) {}
  52
  53 #ifdef CONFIG_CGROUPS
  54 static inline int psi_cgroup_alloc(struct cgroup *cgrp)
  55 {
  56         return 0;
  57 }
  58 static inline void psi_cgroup_free(struct cgroup *cgrp)
  59 {
  60 }
  61 static inline void cgroup_move_task(struct task_struct *p, struct css_set *to)
  62 {
  63         rcu_assign_pointer(p->cgroups, to);
  64 }
  65 static inline void psi_cgroup_restart(struct psi_group *group) {}
  66 #endif
  67
  68 #endif /* CONFIG_PSI */
  69
  70 #endif /* _LINUX_PSI_H */