Line data    Source code

       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             : 
      13             : struct 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             :         spinlock_t 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             : 
      30             : struct mem_cgroup;
      31             : 
      32             : #ifdef CONFIG_MEMCG
      33             : extern void vmpressure(gfp_t gfp, struct mem_cgroup *memcg, bool tree,
      34             :                        unsigned long scanned, unsigned long reclaimed);
      35             : extern void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg, int prio);
      36             : 
      37             : extern void vmpressure_init(struct vmpressure *vmpr);
      38             : extern void vmpressure_cleanup(struct vmpressure *vmpr);
      39             : extern struct vmpressure *memcg_to_vmpressure(struct mem_cgroup *memcg);
      40             : extern struct cgroup_subsys_state *vmpressure_to_css(struct vmpressure *vmpr);
      41             : extern int vmpressure_register_event(struct mem_cgroup *memcg,
      42             :                                      struct eventfd_ctx *eventfd,
      43             :                                      const char *args);
      44             : extern void vmpressure_unregister_event(struct mem_cgroup *memcg,
      45             :                                         struct eventfd_ctx *eventfd);
      46             : #else
      47           0 : static inline void vmpressure(gfp_t gfp, struct mem_cgroup *memcg, bool tree,
      48           0 :                               unsigned long scanned, unsigned long reclaimed) {}
      49           0 : static inline void vmpressure_prio(gfp_t gfp, struct mem_cgroup *memcg,
      50           0 :                                    int prio) {}
      51             : #endif /* CONFIG_MEMCG */
      52             : #endif /* __LINUX_VMPRESSURE_H */