| /* 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; |
| |
| /* Stats that can be updated by kernel. */ |
| enum mem_cgroup_page_stat_item { |
| MEMCG_NR_FILE_MAPPED, /* # of pages charged as file rss */ |
| }; |
| |
| 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, gfp_t gfp_mask); |
| extern void mem_cgroup_end_migration(struct mem_cgroup *mem, |
| struct page *oldpage, struct page *newpage, bool migration_ok); |
| |
| /* |
| * 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_page_stat(struct page *page, |
| enum mem_cgroup_page_stat_item idx, |
| int val); |
| |
| static inline void mem_cgroup_inc_page_stat(struct page *page, |
| enum mem_cgroup_page_stat_item idx) |
| { |
| mem_cgroup_update_page_stat(page, idx, 1); |
| } |
| |
| static inline void mem_cgroup_dec_page_stat(struct page *page, |
| enum mem_cgroup_page_stat_item idx) |
| { |
| mem_cgroup_update_page_stat(page, idx, -1); |
| } |
| |
| 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); |
| |
| #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| void mem_cgroup_split_huge_fixup(struct page *head, struct page *tail); |
| #endif |
| |
| #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, gfp_t gfp_mask) |
| { |
| return 0; |
| } |
| |
| static inline void mem_cgroup_end_migration(struct mem_cgroup *mem, |
| struct page *oldpage, struct page *newpage, bool migration_ok) |
| { |
| } |
| |
| 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_inc_page_stat(struct page *page, |
| enum mem_cgroup_page_stat_item idx) |
| { |
| } |
| |
| static inline void mem_cgroup_dec_page_stat(struct page *page, |
| enum mem_cgroup_page_stat_item idx) |
| { |
| } |
| |
| 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; |
| } |
| |
| static inline void mem_cgroup_split_huge_fixup(struct page *head, |
| struct page *tail) |
| { |
| } |
| |
| #endif /* CONFIG_CGROUP_MEM_CONT */ |
| |
| #endif /* _LINUX_MEMCONTROL_H */ |
| |