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