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 unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap); 26 27 void drain_all_stock(struct mem_cgroup *root_memcg); 28 29 unsigned long memcg_events(struct mem_cgroup *memcg, int event); 30 unsigned long memcg_page_state_output(struct mem_cgroup *memcg, int item); 31 int memory_stat_show(struct seq_file *m, void *v); 32 33 void mem_cgroup_id_get_many(struct mem_cgroup *memcg, unsigned int n); 34 struct mem_cgroup *mem_cgroup_id_get_online(struct mem_cgroup *memcg); 35 36 /* Cgroup v1-specific declarations */ 37 #ifdef CONFIG_MEMCG_V1 38 39 /* Whether legacy memory+swap accounting is active */ 40 static inline bool do_memsw_account(void) 41 { 42 return !cgroup_subsys_on_dfl(memory_cgrp_subsys); 43 } 44 45 unsigned long memcg_events_local(struct mem_cgroup *memcg, int event); 46 unsigned long memcg_page_state_local(struct mem_cgroup *memcg, int idx); 47 unsigned long memcg_page_state_local_output(struct mem_cgroup *memcg, int item); 48 bool memcg1_alloc_events(struct mem_cgroup *memcg); 49 void memcg1_free_events(struct mem_cgroup *memcg); 50 51 void memcg1_memcg_init(struct mem_cgroup *memcg); 52 void memcg1_remove_from_trees(struct mem_cgroup *memcg); 53 54 static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg) 55 { 56 WRITE_ONCE(memcg->soft_limit, PAGE_COUNTER_MAX); 57 } 58 59 struct cgroup_taskset; 60 void memcg1_css_offline(struct mem_cgroup *memcg); 61 62 /* for encoding cft->private value on file */ 63 enum res_type { 64 _MEM, 65 _MEMSWAP, 66 _KMEM, 67 _TCP, 68 }; 69 70 bool memcg1_oom_prepare(struct mem_cgroup *memcg, bool *locked); 71 void memcg1_oom_finish(struct mem_cgroup *memcg, bool locked); 72 void memcg1_oom_recover(struct mem_cgroup *memcg); 73 74 void memcg1_commit_charge(struct folio *folio, struct mem_cgroup *memcg); 75 void memcg1_uncharge_batch(struct mem_cgroup *memcg, unsigned long pgpgout, 76 unsigned long nr_memory, int nid); 77 78 void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s); 79 80 void memcg1_account_kmem(struct mem_cgroup *memcg, int nr_pages); 81 static inline bool memcg1_tcpmem_active(struct mem_cgroup *memcg) 82 { 83 return memcg->tcpmem_active; 84 } 85 bool memcg1_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages, 86 gfp_t gfp_mask); 87 static inline void memcg1_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages) 88 { 89 page_counter_uncharge(&memcg->tcpmem, nr_pages); 90 } 91 92 extern struct cftype memsw_files[]; 93 extern struct cftype mem_cgroup_legacy_files[]; 94 95 #else /* CONFIG_MEMCG_V1 */ 96 97 static inline bool do_memsw_account(void) { return false; } 98 static inline bool memcg1_alloc_events(struct mem_cgroup *memcg) { return true; } 99 static inline void memcg1_free_events(struct mem_cgroup *memcg) {} 100 101 static inline void memcg1_memcg_init(struct mem_cgroup *memcg) {} 102 static inline void memcg1_remove_from_trees(struct mem_cgroup *memcg) {} 103 static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg) {} 104 static inline void memcg1_css_offline(struct mem_cgroup *memcg) {} 105 106 static inline bool memcg1_oom_prepare(struct mem_cgroup *memcg, bool *locked) { return true; } 107 static inline void memcg1_oom_finish(struct mem_cgroup *memcg, bool locked) {} 108 static inline void memcg1_oom_recover(struct mem_cgroup *memcg) {} 109 110 static inline void memcg1_commit_charge(struct folio *folio, 111 struct mem_cgroup *memcg) {} 112 113 static inline void memcg1_uncharge_batch(struct mem_cgroup *memcg, 114 unsigned long pgpgout, 115 unsigned long nr_memory, int nid) {} 116 117 static inline void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s) {} 118 119 static inline void memcg1_account_kmem(struct mem_cgroup *memcg, int nr_pages) {} 120 static inline bool memcg1_tcpmem_active(struct mem_cgroup *memcg) { return false; } 121 static inline bool memcg1_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages, 122 gfp_t gfp_mask) { return true; } 123 static inline void memcg1_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages) {} 124 125 #endif /* CONFIG_MEMCG_V1 */ 126 127 #endif /* __MM_MEMCONTROL_V1_H */ 128