/* memcontrol.h - Memory Controller
   *
   * Copyright IBM Corporation, 2007
   * Author Balbir Singh <balbir@linux.vnet.ibm.com>
   *

   * Copyright 2007 OpenVZ SWsoft Inc
   * Author: Pavel Emelianov <xemul@openvz.org>
   *

   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   */
  
  #ifndef _LINUX_MEMCONTROL_H
  #define _LINUX_MEMCONTROL_H

  #include <linux/cgroup.h>

  struct mem_cgroup;
  struct page_cgroup;

  struct page;
  struct mm_struct;

  extern unsigned long mem_cgroup_isolate_pages(unsigned long nr_to_scan,
  					struct list_head *dst,
  					unsigned long *scanned, int order,
  					int mode, struct zone *z,
  					struct mem_cgroup *mem_cont,
  					int active, int file);

  #ifdef CONFIG_CGROUP_MEM_RES_CTLR

  /*
   * All "charge" functions with gfp_mask should use GFP_KERNEL or
   * (gfp_mask & GFP_RECLAIM_MASK). In current implementatin, memcg doesn't
   * alloc memory but reclaims memory from all available zones. So, "where I want
   * memory from" bits of gfp_mask has no meaning. So any bits of that field is
   * available but adding a rule is better. charge functions' gfp_mask should
   * be set to GFP_KERNEL or gfp_mask & GFP_RECLAIM_MASK for avoiding ambiguous
   * codes.
   * (Of course, if memcg does memory allocation in future, GFP_KERNEL is sane.)
   */

  extern int mem_cgroup_newpage_charge(struct page *page, struct mm_struct *mm,

  				gfp_t gfp_mask);

  /* for swap handling */

  extern int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
  		struct page *page, gfp_t mask, struct mem_cgroup **ptr);

  extern void mem_cgroup_commit_charge_swapin(struct page *page,
  					struct mem_cgroup *ptr);
  extern void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr);

  extern int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
  					gfp_t gfp_mask);

  extern void mem_cgroup_add_lru_list(struct page *page, enum lru_list lru);
  extern void mem_cgroup_del_lru_list(struct page *page, enum lru_list lru);
  extern void mem_cgroup_rotate_lru_list(struct page *page, enum lru_list lru);
  extern void mem_cgroup_del_lru(struct page *page);
  extern void mem_cgroup_move_lists(struct page *page,
  				  enum lru_list from, enum lru_list to);

  
  /* For coalescing uncharge for reducing memcg' overhead*/
  extern void mem_cgroup_uncharge_start(void);
  extern void mem_cgroup_uncharge_end(void);

  extern void mem_cgroup_uncharge_page(struct page *page);

  extern void mem_cgroup_uncharge_cache_page(struct page *page);

  extern int mem_cgroup_shmem_charge_fallback(struct page *page,

  			struct mm_struct *mm, gfp_t gfp_mask);

  extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);

  int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);

  extern struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page);

  extern struct mem_cgroup *mem_cgroup_from_task(struct task_struct *p);

  static inline
  int mm_match_cgroup(const struct mm_struct *mm, const struct mem_cgroup *cgroup)
  {
  	struct mem_cgroup *mem;
  	rcu_read_lock();

  	mem = mem_cgroup_from_task(rcu_dereference((mm)->owner));

  	rcu_read_unlock();
  	return cgroup == mem;
  }

  extern struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem);

  extern int

  mem_cgroup_prepare_migration(struct page *page,
  	struct page *newpage, struct mem_cgroup **ptr);

  extern void mem_cgroup_end_migration(struct mem_cgroup *mem,
  	struct page *oldpage, struct page *newpage);

  /*
   * For memory reclaim.
   */

  int mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg);

  int mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg);

  unsigned long mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg,
  				       struct zone *zone,
  				       enum lru_list lru);

  struct zone_reclaim_stat *mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg,
  						      struct zone *zone);
  struct zone_reclaim_stat*
  mem_cgroup_get_reclaim_stat_from_page(struct page *page);

  extern void mem_cgroup_print_oom_info(struct mem_cgroup *memcg,
  					struct task_struct *p);

  #ifdef CONFIG_CGROUP_MEM_RES_CTLR_SWAP
  extern int do_swap_account;
  #endif

  
  static inline bool mem_cgroup_disabled(void)
  {
  	if (mem_cgroup_subsys.disabled)
  		return true;
  	return false;
  }

  void mem_cgroup_update_file_mapped(struct page *page, int val);

  unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,

  						gfp_t gfp_mask);

  u64 mem_cgroup_get_limit(struct mem_cgroup *mem);

  #else /* CONFIG_CGROUP_MEM_RES_CTLR */

  struct mem_cgroup;
  
  static inline int mem_cgroup_newpage_charge(struct page *page,

  					struct mm_struct *mm, gfp_t gfp_mask)

  {
  	return 0;
  }

  static inline int mem_cgroup_cache_charge(struct page *page,
  					struct mm_struct *mm, gfp_t gfp_mask)

  {

  	return 0;

  }

  static inline int mem_cgroup_try_charge_swapin(struct mm_struct *mm,
  		struct page *page, gfp_t gfp_mask, struct mem_cgroup **ptr)

  {
  	return 0;
  }
  
  static inline void mem_cgroup_commit_charge_swapin(struct page *page,
  					  struct mem_cgroup *ptr)
  {
  }
  
  static inline void mem_cgroup_cancel_charge_swapin(struct mem_cgroup *ptr)
  {
  }

  static inline void mem_cgroup_uncharge_start(void)
  {
  }
  
  static inline void mem_cgroup_uncharge_end(void)
  {
  }

  static inline void mem_cgroup_uncharge_page(struct page *page)
  {
  }

  static inline void mem_cgroup_uncharge_cache_page(struct page *page)
  {
  }

  static inline int mem_cgroup_shmem_charge_fallback(struct page *page,

  			struct mm_struct *mm, gfp_t gfp_mask)

  {
  	return 0;
  }

  static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
  {
  }
  
  static inline void mem_cgroup_del_lru_list(struct page *page, int lru)
  {
  	return ;
  }
  
  static inline void mem_cgroup_rotate_lru_list(struct page *page, int lru)
  {
  	return ;
  }
  
  static inline void mem_cgroup_del_lru(struct page *page)
  {
  	return ;
  }
  
  static inline void
  mem_cgroup_move_lists(struct page *page, enum lru_list from, enum lru_list to)

  {
  }

  static inline struct mem_cgroup *try_get_mem_cgroup_from_page(struct page *page)
  {
  	return NULL;
  }

  static inline int mm_match_cgroup(struct mm_struct *mm, struct mem_cgroup *mem)

  {

  	return 1;

  }

  static inline int task_in_mem_cgroup(struct task_struct *task,
  				     const struct mem_cgroup *mem)
  {
  	return 1;
  }

  static inline struct cgroup_subsys_state *mem_cgroup_css(struct mem_cgroup *mem)
  {
  	return NULL;
  }

  static inline int

  mem_cgroup_prepare_migration(struct page *page, struct page *newpage,
  	struct mem_cgroup **ptr)

  {
  	return 0;
  }

  static inline void mem_cgroup_end_migration(struct mem_cgroup *mem,
  					struct page *oldpage,
  					struct page *newpage)

  {
  }

  static inline int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem)
  {
  	return 0;
  }
  
  static inline void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem,
  						int priority)
  {
  }
  
  static inline void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem,
  						int priority)
  {
  }

  static inline bool mem_cgroup_disabled(void)
  {
  	return true;
  }

  static inline int

  mem_cgroup_inactive_anon_is_low(struct mem_cgroup *memcg)

  {
  	return 1;
  }

  static inline int
  mem_cgroup_inactive_file_is_low(struct mem_cgroup *memcg)
  {
  	return 1;
  }

  static inline unsigned long
  mem_cgroup_zone_nr_pages(struct mem_cgroup *memcg, struct zone *zone,
  			 enum lru_list lru)
  {
  	return 0;
  }

  static inline struct zone_reclaim_stat*
  mem_cgroup_get_reclaim_stat(struct mem_cgroup *memcg, struct zone *zone)
  {
  	return NULL;
  }
  
  static inline struct zone_reclaim_stat*
  mem_cgroup_get_reclaim_stat_from_page(struct page *page)
  {
  	return NULL;
  }

  static inline void
  mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p)
  {
  }

  static inline void mem_cgroup_update_file_mapped(struct page *page,

  							int val)
  {
  }

  static inline
  unsigned long mem_cgroup_soft_limit_reclaim(struct zone *zone, int order,

  					    gfp_t gfp_mask)

  {
  	return 0;
  }

  static inline
  u64 mem_cgroup_get_limit(struct mem_cgroup *mem)
  {
  	return 0;
  }

  #endif /* CONFIG_CGROUP_MEM_CONT */

  #endif /* _LINUX_MEMCONTROL_H */