| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| 2 | #ifndef __LINUX_VMPRESSURE_H |
| 3 | #define __LINUX_VMPRESSURE_H |
| 4 | |
| 5 | #include <linux/mutex.h> |
| 6 | #include <linux/list.h> |
| 7 | #include <linux/workqueue.h> |
| 8 | #include <linux/gfp.h> |
| 9 | #include <linux/types.h> |
| 10 | #include <linux/cgroup.h> |
| 11 | #include <linux/eventfd.h> |
| 12 | |
| 13 | struct vmpressure { |
| 14 | unsigned long scanned; |
| 15 | unsigned long reclaimed; |
| 16 | |
| 17 | unsigned long tree_scanned; |
| 18 | unsigned long tree_reclaimed; |
| 19 | /* The lock is used to keep the scanned/reclaimed above in sync. */ |
| 20 | spinlock_t sr_lock; |
| 21 | |
| 22 | /* The list of vmpressure_event structs. */ |
| 23 | struct list_head events; |
| 24 | /* Have to grab the lock on events traversal or modifications. */ |
| 25 | struct mutex events_lock; |
| 26 | |
| 27 | struct work_struct work; |
| 28 | }; |
| 29 | |
| 30 | struct mem_cgroup; |
| 31 | |
| 32 | #ifdef CONFIG_MEMCG |
| 33 | extern void vmpressure(gfp_t gfp, struct mem_cgroup *memcg, bool tree, |
| 34 | unsigned long scanned, unsigned long reclaimed); |
| 35 | extern void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, int prio); |
| 36 | |
| 37 | extern void vmpressure_init(struct vmpressure *vmpr); |
| 38 | extern void vmpressure_cleanup(struct vmpressure *vmpr); |
| 39 | extern struct vmpressure *memcg_to_vmpressure(struct mem_cgroup *memcg); |
| 40 | extern struct mem_cgroup *vmpressure_to_memcg(struct vmpressure *vmpr); |
| 41 | extern int vmpressure_register_event(struct mem_cgroup *memcg, |
| 42 | struct eventfd_ctx *eventfd, |
| 43 | const char *args); |
| 44 | extern void vmpressure_unregister_event(struct mem_cgroup *memcg, |
| 45 | struct eventfd_ctx *eventfd); |
| 46 | #else |
| 47 | static inline void vmpressure(gfp_t gfp, struct mem_cgroup *memcg, bool tree, |
| 48 | unsigned long scanned, unsigned long reclaimed) {} |
| 49 | static inline void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, |
| 50 | int prio) {} |
| 51 | #endif /* CONFIG_MEMCG */ |
| 52 | #endif /* __LINUX_VMPRESSURE_H */ |