root/include/linux/vmpressure.h

DEFINITIONS

1. vmpressure
2. vmpressure_prio

#ifndef __LINUX_VMPRESSURE_H
#define __LINUX_VMPRESSURE_H

#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/workqueue.h>
#include <linux/gfp.h>
#include <linux/types.h>
#include <linux/cgroup.h>
#include <linux/eventfd.h>

struct vmpressure {
        unsigned long scanned;
        unsigned long reclaimed;
        /* The lock is used to keep the scanned/reclaimed above in sync. */
        struct spinlock sr_lock;

        /* The list of vmpressure_event structs. */
        struct list_head events;
        /* Have to grab the lock on events traversal or modifications. */
        struct mutex events_lock;

        struct work_struct work;
};

struct mem_cgroup;

#ifdef CONFIG_MEMCG
extern void vmpressure(gfp_t gfp, struct mem_cgroup *memcg,
                       unsigned long scanned, unsigned long reclaimed);
extern void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, int prio);

extern void vmpressure_init(struct vmpressure *vmpr);
extern void vmpressure_cleanup(struct vmpressure *vmpr);
extern struct vmpressure *memcg_to_vmpressure(struct mem_cgroup *memcg);
extern struct cgroup_subsys_state *vmpressure_to_css(struct vmpressure *vmpr);
extern int vmpressure_register_event(struct mem_cgroup *memcg,
                                     struct eventfd_ctx *eventfd,
                                     const char *args);
extern void vmpressure_unregister_event(struct mem_cgroup *memcg,
                                        struct eventfd_ctx *eventfd);
#else
static inline void vmpressure(gfp_t gfp, struct mem_cgroup *memcg,
                              unsigned long scanned, unsigned long reclaimed) {}
static inline void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg,
                                   int prio) {}
#endif /* CONFIG_MEMCG */
#endif /* __LINUX_VMPRESSURE_H */