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 */
do_memsw_account(void)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
memcg1_soft_limit_reset(struct mem_cgroup * memcg)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);
memcg1_tcpmem_active(struct mem_cgroup * memcg)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);
memcg1_uncharge_skmem(struct mem_cgroup * memcg,unsigned int nr_pages)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
do_memsw_account(void)97 static inline bool do_memsw_account(void) { return false; }
memcg1_alloc_events(struct mem_cgroup * memcg)98 static inline bool memcg1_alloc_events(struct mem_cgroup *memcg) { return true; }
memcg1_free_events(struct mem_cgroup * memcg)99 static inline void memcg1_free_events(struct mem_cgroup *memcg) {}
100
memcg1_memcg_init(struct mem_cgroup * memcg)101 static inline void memcg1_memcg_init(struct mem_cgroup *memcg) {}
memcg1_remove_from_trees(struct mem_cgroup * memcg)102 static inline void memcg1_remove_from_trees(struct mem_cgroup *memcg) {}
memcg1_soft_limit_reset(struct mem_cgroup * memcg)103 static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg) {}
memcg1_css_offline(struct mem_cgroup * memcg)104 static inline void memcg1_css_offline(struct mem_cgroup *memcg) {}
105
memcg1_oom_prepare(struct mem_cgroup * memcg,bool * locked)106 static inline bool memcg1_oom_prepare(struct mem_cgroup *memcg, bool *locked) { return true; }
memcg1_oom_finish(struct mem_cgroup * memcg,bool locked)107 static inline void memcg1_oom_finish(struct mem_cgroup *memcg, bool locked) {}
memcg1_oom_recover(struct mem_cgroup * memcg)108 static inline void memcg1_oom_recover(struct mem_cgroup *memcg) {}
109
memcg1_commit_charge(struct folio * folio,struct mem_cgroup * memcg)110 static inline void memcg1_commit_charge(struct folio *folio,
111 struct mem_cgroup *memcg) {}
112
memcg1_uncharge_batch(struct mem_cgroup * memcg,unsigned long pgpgout,unsigned long nr_memory,int nid)113 static inline void memcg1_uncharge_batch(struct mem_cgroup *memcg,
114 unsigned long pgpgout,
115 unsigned long nr_memory, int nid) {}
116
memcg1_stat_format(struct mem_cgroup * memcg,struct seq_buf * s)117 static inline void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s) {}
118
memcg1_account_kmem(struct mem_cgroup * memcg,int nr_pages)119 static inline void memcg1_account_kmem(struct mem_cgroup *memcg, int nr_pages) {}
memcg1_tcpmem_active(struct mem_cgroup * memcg)120 static inline bool memcg1_tcpmem_active(struct mem_cgroup *memcg) { return false; }
memcg1_charge_skmem(struct mem_cgroup * memcg,unsigned int nr_pages,gfp_t gfp_mask)121 static inline bool memcg1_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages,
122 gfp_t gfp_mask) { return true; }
memcg1_uncharge_skmem(struct mem_cgroup * memcg,unsigned int nr_pages)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