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 */ |
53 | |