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
try_charge(struct mem_cgroup * memcg,gfp_t gfp_mask,unsigned int nr_pages)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 */
do_memsw_account(void)41 static inline 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
memcg1_soft_limit_reset(struct mem_cgroup * memcg)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);
memcg1_tcpmem_active(struct mem_cgroup * memcg)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);
memcg1_uncharge_skmem(struct mem_cgroup * memcg,unsigned int nr_pages)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
memcg1_alloc_events(struct mem_cgroup * memcg)122 static inline bool memcg1_alloc_events(struct mem_cgroup *memcg) { return true; }
memcg1_free_events(struct mem_cgroup * memcg)123 static inline void memcg1_free_events(struct mem_cgroup *memcg) {}
124
memcg1_memcg_init(struct mem_cgroup * memcg)125 static inline void memcg1_memcg_init(struct mem_cgroup *memcg) {}
memcg1_remove_from_trees(struct mem_cgroup * memcg)126 static inline void memcg1_remove_from_trees(struct mem_cgroup *memcg) {}
memcg1_soft_limit_reset(struct mem_cgroup * memcg)127 static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg) {}
memcg1_css_offline(struct mem_cgroup * memcg)128 static inline void memcg1_css_offline(struct mem_cgroup *memcg) {}
129
memcg1_oom_prepare(struct mem_cgroup * memcg,bool * locked)130 static inline bool memcg1_oom_prepare(struct mem_cgroup *memcg, bool *locked) { return true; }
memcg1_oom_finish(struct mem_cgroup * memcg,bool locked)131 static inline void memcg1_oom_finish(struct mem_cgroup *memcg, bool locked) {}
memcg1_oom_recover(struct mem_cgroup * memcg)132 static inline void memcg1_oom_recover(struct mem_cgroup *memcg) {}
133
memcg1_commit_charge(struct folio * folio,struct mem_cgroup * memcg)134 static inline void memcg1_commit_charge(struct folio *folio,
135 struct mem_cgroup *memcg) {}
136
memcg1_swapout(struct folio * folio,struct mem_cgroup * memcg)137 static inline void memcg1_swapout(struct folio *folio, struct mem_cgroup *memcg) {}
138
memcg1_uncharge_batch(struct mem_cgroup * memcg,unsigned long pgpgout,unsigned long nr_memory,int nid)139 static inline void memcg1_uncharge_batch(struct mem_cgroup *memcg,
140 unsigned long pgpgout,
141 unsigned long nr_memory, int nid) {}
142
memcg1_stat_format(struct mem_cgroup * memcg,struct seq_buf * s)143 static inline void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s) {}
144
memcg1_account_kmem(struct mem_cgroup * memcg,int nr_pages)145 static inline void memcg1_account_kmem(struct mem_cgroup *memcg, int nr_pages) {}
memcg1_tcpmem_active(struct mem_cgroup * memcg)146 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)147 static inline bool memcg1_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages,
148 gfp_t gfp_mask) { return true; }
memcg1_uncharge_skmem(struct mem_cgroup * memcg,unsigned int nr_pages)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