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
13struct 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 struct spinlock 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
30struct mem_cgroup;
31
32#ifdef CONFIG_MEMCG
33extern void vmpressure(gfp_t gfp, struct mem_cgroup *memcg, bool tree,
34 unsigned long scanned, unsigned long reclaimed);
35extern void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, int prio);
36
37extern void vmpressure_init(struct vmpressure *vmpr);
38extern void vmpressure_cleanup(struct vmpressure *vmpr);
39extern struct vmpressure *memcg_to_vmpressure(struct mem_cgroup *memcg);
40extern struct cgroup_subsys_state *vmpressure_to_css(struct vmpressure *vmpr);
41extern int vmpressure_register_event(struct mem_cgroup *memcg,
42 struct eventfd_ctx *eventfd,
43 const char *args);
44extern void vmpressure_unregister_event(struct mem_cgroup *memcg,
45 struct eventfd_ctx *eventfd);
46#else
47static inline void vmpressure(gfp_t gfp, struct mem_cgroup *memcg, bool tree,
48 unsigned long scanned, unsigned long reclaimed) {}
49static inline void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg,
50 int prio) {}
51#endif /* CONFIG_MEMCG */
52#endif /* __LINUX_VMPRESSURE_H */
53