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 int try_charge_memcg(struct mem_cgroup *memcg, gfp_t gfp_mask, 11 unsigned int nr_pages); 12 13 static inline int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask, 14 unsigned int nr_pages) 15 { 16 if (mem_cgroup_is_root(memcg)) 17 return 0; 18 19 return try_charge_memcg(memcg, gfp_mask, nr_pages); 20 } 21 22 void mem_cgroup_id_get_many(struct mem_cgroup *memcg, unsigned int n); 23 void mem_cgroup_id_put_many(struct mem_cgroup *memcg, unsigned int n); 24 25 /* 26 * Iteration constructs for visiting all cgroups (under a tree). If 27 * loops are exited prematurely (break), mem_cgroup_iter_break() must 28 * be used for reference counting. 29 */ 30 #define for_each_mem_cgroup_tree(iter, root) \ 31 for (iter = mem_cgroup_iter(root, NULL, NULL); \ 32 iter != NULL; \ 33 iter = mem_cgroup_iter(root, iter, NULL)) 34 35 #define for_each_mem_cgroup(iter) \ 36 for (iter = mem_cgroup_iter(NULL, NULL, NULL); \ 37 iter != NULL; \ 38 iter = mem_cgroup_iter(NULL, iter, NULL)) 39 40 /* Whether legacy memory+swap accounting is active */ 41 static bool do_memsw_account(void) 42 { 43 return !cgroup_subsys_on_dfl(memory_cgrp_subsys); 44 } 45 46 /* 47 * Per memcg event counter is incremented at every pagein/pageout. With THP, 48 * it will be incremented by the number of pages. This counter is used 49 * to trigger some periodic events. This is straightforward and better 50 * than using jiffies etc. to handle periodic memcg event. 51 */ 52 enum mem_cgroup_events_target { 53 MEM_CGROUP_TARGET_THRESH, 54 MEM_CGROUP_TARGET_SOFTLIMIT, 55 MEM_CGROUP_NTARGETS, 56 }; 57 58 unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap); 59 60 void drain_all_stock(struct mem_cgroup *root_memcg); 61 62 unsigned long memcg_events(struct mem_cgroup *memcg, int event); 63 unsigned long memcg_events_local(struct mem_cgroup *memcg, int event); 64 unsigned long memcg_page_state_local(struct mem_cgroup *memcg, int idx); 65 unsigned long memcg_page_state_output(struct mem_cgroup *memcg, int item); 66 unsigned long memcg_page_state_local_output(struct mem_cgroup *memcg, int item); 67 int memory_stat_show(struct seq_file *m, void *v); 68 69 /* Cgroup v1-specific declarations */ 70 #ifdef CONFIG_MEMCG_V1 71 72 bool memcg1_alloc_events(struct mem_cgroup *memcg); 73 void memcg1_free_events(struct mem_cgroup *memcg); 74 75 void memcg1_memcg_init(struct mem_cgroup *memcg); 76 void memcg1_remove_from_trees(struct mem_cgroup *memcg); 77 78 static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg) 79 { 80 WRITE_ONCE(memcg->soft_limit, PAGE_COUNTER_MAX); 81 } 82 83 struct cgroup_taskset; 84 void memcg1_css_offline(struct mem_cgroup *memcg); 85 86 /* for encoding cft->private value on file */ 87 enum res_type { 88 _MEM, 89 _MEMSWAP, 90 _KMEM, 91 _TCP, 92 }; 93 94 bool memcg1_oom_prepare(struct mem_cgroup *memcg, bool *locked); 95 void memcg1_oom_finish(struct mem_cgroup *memcg, bool locked); 96 void memcg1_oom_recover(struct mem_cgroup *memcg); 97 98 void memcg1_commit_charge(struct folio *folio, struct mem_cgroup *memcg); 99 void memcg1_swapout(struct folio *folio, struct mem_cgroup *memcg); 100 void memcg1_uncharge_batch(struct mem_cgroup *memcg, unsigned long pgpgout, 101 unsigned long nr_memory, int nid); 102 103 void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s); 104 105 void memcg1_account_kmem(struct mem_cgroup *memcg, int nr_pages); 106 static inline bool memcg1_tcpmem_active(struct mem_cgroup *memcg) 107 { 108 return memcg->tcpmem_active; 109 } 110 bool memcg1_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages, 111 gfp_t gfp_mask); 112 static inline void memcg1_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages) 113 { 114 page_counter_uncharge(&memcg->tcpmem, nr_pages); 115 } 116 117 extern struct cftype memsw_files[]; 118 extern struct cftype mem_cgroup_legacy_files[]; 119 120 #else /* CONFIG_MEMCG_V1 */ 121 122 static inline bool memcg1_alloc_events(struct mem_cgroup *memcg) { return true; } 123 static inline void memcg1_free_events(struct mem_cgroup *memcg) {} 124 125 static inline void memcg1_memcg_init(struct mem_cgroup *memcg) {} 126 static inline void memcg1_remove_from_trees(struct mem_cgroup *memcg) {} 127 static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg) {} 128 static inline void memcg1_css_offline(struct mem_cgroup *memcg) {} 129 130 static inline bool memcg1_oom_prepare(struct mem_cgroup *memcg, bool *locked) { return true; } 131 static inline void memcg1_oom_finish(struct mem_cgroup *memcg, bool locked) {} 132 static inline void memcg1_oom_recover(struct mem_cgroup *memcg) {} 133 134 static inline void memcg1_commit_charge(struct folio *folio, 135 struct mem_cgroup *memcg) {} 136 137 static inline void memcg1_swapout(struct folio *folio, struct mem_cgroup *memcg) {} 138 139 static inline void memcg1_uncharge_batch(struct mem_cgroup *memcg, 140 unsigned long pgpgout, 141 unsigned long nr_memory, int nid) {} 142 143 static inline void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s) {} 144 145 static inline void memcg1_account_kmem(struct mem_cgroup *memcg, int nr_pages) {} 146 static inline bool memcg1_tcpmem_active(struct mem_cgroup *memcg) { return false; } 147 static inline bool memcg1_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages, 148 gfp_t gfp_mask) { return true; } 149 static inline void memcg1_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages) {} 150 151 #endif /* CONFIG_MEMCG_V1 */ 152 153 #endif /* __MM_MEMCONTROL_V1_H */ 154