include/linux/vmpressure.h

   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
  42 static inline void vmpressure(gfp_t gfp, struct mem_cgroup *memcg,
  43                               unsigned long scanned, unsigned long reclaimed) {}
  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 */