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, 27 char *buf, enum psi_res res, struct file *file); 28 void psi_trigger_destroy(struct psi_trigger *t); 29 30 __poll_t psi_trigger_poll(void **trigger_ptr, struct file *file, 31 poll_table *wait); 32 33 #ifdef CONFIG_CGROUPS 34 static inline struct psi_group *cgroup_psi(struct cgroup *cgrp) 35 { 36 return cgroup_ino(cgrp) == 1 ? &psi_system : cgrp->psi; 37 } 38 39 int psi_cgroup_alloc(struct cgroup *cgrp); 40 void psi_cgroup_free(struct cgroup *cgrp); 41 void cgroup_move_task(struct task_struct *p, struct css_set *to); 42 void psi_cgroup_restart(struct psi_group *group); 43 #endif 44 45 #else /* CONFIG_PSI */ 46 47 static inline void psi_init(void) {} 48 49 static inline void psi_memstall_enter(unsigned long *flags) {} 50 static inline void psi_memstall_leave(unsigned long *flags) {} 51 52 #ifdef CONFIG_CGROUPS 53 static inline int psi_cgroup_alloc(struct cgroup *cgrp) 54 { 55 return 0; 56 } 57 static inline void psi_cgroup_free(struct cgroup *cgrp) 58 { 59 } 60 static inline void cgroup_move_task(struct task_struct *p, struct css_set *to) 61 { 62 rcu_assign_pointer(p->cgroups, to); 63 } 64 static inline void psi_cgroup_restart(struct psi_group *group) {} 65 #endif 66 67 #endif /* CONFIG_PSI */ 68 69 #endif /* _LINUX_PSI_H */ 70