1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 3 #ifndef __MM_MEMCONTROL_V1_H 4 #define __MM_MEMCONTROL_V1_H 5 6 #include <linux/cgroup-defs.h> 7 8 /* Cgroup v1 and v2 common declarations */ 9 10 /* 11 * Iteration constructs for visiting all cgroups (under a tree). If 12 * loops are exited prematurely (break), mem_cgroup_iter_break() must 13 * be used for reference counting. 14 */ 15 #define for_each_mem_cgroup_tree(iter, root) \ 16 for (iter = mem_cgroup_iter(root, NULL, NULL); \ 17 iter != NULL; \ 18 iter = mem_cgroup_iter(root, iter, NULL)) 19 20 #define for_each_mem_cgroup(iter) \ 21 for (iter = mem_cgroup_iter(NULL, NULL, NULL); \ 22 iter != NULL; \ 23 iter = mem_cgroup_iter(NULL, iter, NULL)) 24 25 void drain_all_stock(struct mem_cgroup *root_memcg); 26 27 unsigned long memcg_events(struct mem_cgroup *memcg, int event); 28 int memory_stat_show(struct seq_file *m, void *v); 29 30 void mem_cgroup_private_id_get_many(struct mem_cgroup *memcg, unsigned int n); 31 struct mem_cgroup *mem_cgroup_private_id_get_online(struct mem_cgroup *memcg); 32 33 /* Cgroup v1-specific declarations */ 34 #ifdef CONFIG_MEMCG_V1 35 36 /* Whether legacy memory+swap accounting is active */ 37 static inline bool do_memsw_account(void) 38 { 39 return !cgroup_subsys_on_dfl(memory_cgrp_subsys); 40 } 41 42 unsigned long memcg_events_local(struct mem_cgroup *memcg, int event); 43 unsigned long memcg_page_state_local(struct mem_cgroup *memcg, int idx); 44 unsigned long memcg_page_state_local_output(struct mem_cgroup *memcg, int item); 45 bool memcg1_alloc_events(struct mem_cgroup *memcg); 46 void memcg1_free_events(struct mem_cgroup *memcg); 47 48 void memcg1_memcg_init(struct mem_cgroup *memcg); 49 void memcg1_remove_from_trees(struct mem_cgroup *memcg); 50 51 static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg) 52 { 53 WRITE_ONCE(memcg->soft_limit, PAGE_COUNTER_MAX); 54 } 55 56 struct cgroup_taskset; 57 void memcg1_css_offline(struct mem_cgroup *memcg); 58 59 /* for encoding cft->private value on file */ 60 enum res_type { 61 _MEM, 62 _MEMSWAP, 63 _KMEM, 64 _TCP, 65 }; 66 67 bool memcg1_oom_prepare(struct mem_cgroup *memcg, bool *locked); 68 void memcg1_oom_finish(struct mem_cgroup *memcg, bool locked); 69 void memcg1_oom_recover(struct mem_cgroup *memcg); 70 71 void memcg1_commit_charge(struct folio *folio, struct mem_cgroup *memcg); 72 void memcg1_uncharge_batch(struct mem_cgroup *memcg, unsigned long pgpgout, 73 unsigned long nr_memory, int nid); 74 75 void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s); 76 77 void memcg1_account_kmem(struct mem_cgroup *memcg, int nr_pages); 78 static inline bool memcg1_tcpmem_active(struct mem_cgroup *memcg) 79 { 80 return memcg->tcpmem_active; 81 } 82 bool memcg1_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages, 83 gfp_t gfp_mask); 84 static inline void memcg1_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages) 85 { 86 page_counter_uncharge(&memcg->tcpmem, nr_pages); 87 } 88 89 extern struct cftype memsw_files[]; 90 extern struct cftype mem_cgroup_legacy_files[]; 91 92 #else /* CONFIG_MEMCG_V1 */ 93 94 static inline bool do_memsw_account(void) { return false; } 95 static inline bool memcg1_alloc_events(struct mem_cgroup *memcg) { return true; } 96 static inline void memcg1_free_events(struct mem_cgroup *memcg) {} 97 98 static inline void memcg1_memcg_init(struct mem_cgroup *memcg) {} 99 static inline void memcg1_remove_from_trees(struct mem_cgroup *memcg) {} 100 static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg) {} 101 static inline void memcg1_css_offline(struct mem_cgroup *memcg) {} 102 103 static inline bool memcg1_oom_prepare(struct mem_cgroup *memcg, bool *locked) { return true; } 104 static inline void memcg1_oom_finish(struct mem_cgroup *memcg, bool locked) {} 105 static inline void memcg1_oom_recover(struct mem_cgroup *memcg) {} 106 107 static inline void memcg1_commit_charge(struct folio *folio, 108 struct mem_cgroup *memcg) {} 109 110 static inline void memcg1_uncharge_batch(struct mem_cgroup *memcg, 111 unsigned long pgpgout, 112 unsigned long nr_memory, int nid) {} 113 114 static inline void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s) {} 115 116 static inline void memcg1_account_kmem(struct mem_cgroup *memcg, int nr_pages) {} 117 static inline bool memcg1_tcpmem_active(struct mem_cgroup *memcg) { return false; } 118 static inline bool memcg1_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages, 119 gfp_t gfp_mask) { return true; } 120 static inline void memcg1_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages) {} 121 122 #endif /* CONFIG_MEMCG_V1 */ 123 124 #endif /* __MM_MEMCONTROL_V1_H */ 125