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 12struct seq_file; 13struct css_set; 14 15#ifdef CONFIG_PSI 16 17extern struct static_key_false psi_disabled; 18extern struct psi_group psi_system; 19 20void psi_init(void); 21 22void psi_memstall_enter(unsigned long *flags); 23void psi_memstall_leave(unsigned long *flags); 24 25int psi_show(struct seq_file *s, struct psi_group *group, enum psi_res res); 26struct 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); 29void 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 35static inline struct psi_group *cgroup_psi(struct cgroup *cgrp) 36{ 37 return cgroup_ino(cgrp) == 1 ? &psi_system : cgrp->psi; 38} 39 40int psi_cgroup_alloc(struct cgroup *cgrp); 41void psi_cgroup_free(struct cgroup *cgrp); 42void cgroup_move_task(struct task_struct *p, struct css_set *to); 43void psi_cgroup_restart(struct psi_group *group); 44#endif 45 46#else /* CONFIG_PSI */ 47 48static inline void psi_init(void) {} 49 50static inline void psi_memstall_enter(unsigned long *flags) {} 51static inline void psi_memstall_leave(unsigned long *flags) {} 52 53#ifdef CONFIG_CGROUPS 54static inline int psi_cgroup_alloc(struct cgroup *cgrp) 55{ 56 return 0; 57} 58static inline void psi_cgroup_free(struct cgroup *cgrp) 59{ 60} 61static inline void cgroup_move_task(struct task_struct *p, struct css_set *to) 62{ 63 rcu_assign_pointer(p->cgroups, to); 64} 65static inline void psi_cgroup_restart(struct psi_group *group) {} 66#endif 67 68#endif /* CONFIG_PSI */ 69 70#endif /* _LINUX_PSI_H */ 71