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