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 cgroup_subsys_state *vmpressure_to_css(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
vmpressure(gfp_t gfp,struct mem_cgroup * memcg,bool tree,unsigned long scanned,unsigned long reclaimed)47 static inline void vmpressure(gfp_t gfp, struct mem_cgroup *memcg, bool tree,
48 unsigned long scanned, unsigned long reclaimed) {}
vmpressure_prio(gfp_t gfp,struct mem_cgroup * memcg,int prio)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