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