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