/* 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; #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); extern void mem_cgroup_uncharge_page(struct page *page); extern void mem_cgroup_uncharge_cache_page(struct page *page); extern int mem_cgroup_shrink_usage(struct page *page, struct mm_struct *mm, gfp_t gfp_mask); 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); 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 *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((mm)->owner); rcu_read_unlock(); return cgroup == mem; } extern int mem_cgroup_prepare_migration(struct page *page, struct mem_cgroup **ptr); extern void mem_cgroup_end_migration(struct mem_cgroup *mem, struct page *oldpage, struct page *newpage); /* * For memory reclaim. */ extern int mem_cgroup_calc_mapped_ratio(struct mem_cgroup *mem); extern long mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem); extern int mem_cgroup_get_reclaim_priority(struct mem_cgroup *mem); extern void mem_cgroup_note_reclaim_priority(struct mem_cgroup *mem, int priority); extern void mem_cgroup_record_reclaim_priority(struct mem_cgroup *mem, int priority); int mem_cgroup_inactive_anon_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); #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; } extern bool mem_cgroup_oom_called(struct task_struct *task); #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_page(struct page *page) { } static inline void mem_cgroup_uncharge_cache_page(struct page *page) { } static inline int mem_cgroup_shrink_usage(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 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 int mem_cgroup_prepare_migration(struct page *page, 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_calc_mapped_ratio(struct mem_cgroup *mem) { return 0; } static inline int mem_cgroup_reclaim_imbalance(struct mem_cgroup *mem) { return 0; } 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 bool mem_cgroup_oom_called(struct task_struct *task) { return false; } static inline int mem_cgroup_inactive_anon_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; } #endif /* CONFIG_CGROUP_MEM_CONT */ #endif /* _LINUX_MEMCONTROL_H */