LXR linux/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
  11struct 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
  25struct mem_cgroup;
  26
  27#ifdef CONFIG_MEMCG
  28extern void vmpressure(gfp_t gfp, struct mem_cgroup *memcg,
  29                       unsigned long scanned, unsigned long reclaimed);
  30extern void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, int prio);
  31
  32extern void vmpressure_init(struct vmpressure *vmpr);
  33extern struct vmpressure *memcg_to_vmpressure(struct mem_cgroup *memcg);
  34extern struct cgroup_subsys_state *vmpressure_to_css(struct vmpressure *vmpr);
  35extern struct vmpressure *css_to_vmpressure(struct cgroup_subsys_state *css);
  36extern int vmpressure_register_event(struct cgroup *cg, struct cftype *cft,
  37                                     struct eventfd_ctx *eventfd,
  38                                     const char *args);
  39extern void vmpressure_unregister_event(struct cgroup *cg, struct cftype *cft,
  40                                        struct eventfd_ctx *eventfd);
  41#else
  42static inline void vmpressure(gfp_t gfp, struct mem_cgroup *memcg,
  43                              unsigned long scanned, unsigned long reclaimed) {}
  44static inline void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg,
  45                                   int prio) {}
  46#endif /* CONFIG_MEMCG */
  47#endif /* __LINUX_VMPRESSURE_H */
  48