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
25unsigned long mem_cgroup_usage(struct mem_cgroup *memcg, bool swap);
26
27void drain_all_stock(struct mem_cgroup *root_memcg);
28
29unsigned long memcg_events(struct mem_cgroup *memcg, int event);
30unsigned long memcg_page_state_output(struct mem_cgroup *memcg, int item);
31int memory_stat_show(struct seq_file *m, void *v);
32
33void mem_cgroup_id_get_many(struct mem_cgroup *memcg, unsigned int n);
34struct 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 */
40static inline bool do_memsw_account(void)
41{
42 return !cgroup_subsys_on_dfl(memory_cgrp_subsys);
43}
44
45unsigned long memcg_events_local(struct mem_cgroup *memcg, int event);
46unsigned long memcg_page_state_local(struct mem_cgroup *memcg, int idx);
47unsigned long memcg_page_state_local_output(struct mem_cgroup *memcg, int item);
48bool memcg1_alloc_events(struct mem_cgroup *memcg);
49void memcg1_free_events(struct mem_cgroup *memcg);
50
51void memcg1_memcg_init(struct mem_cgroup *memcg);
52void memcg1_remove_from_trees(struct mem_cgroup *memcg);
53
54static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg)
55{
56 WRITE_ONCE(memcg->soft_limit, PAGE_COUNTER_MAX);
57}
58
59struct cgroup_taskset;
60void memcg1_css_offline(struct mem_cgroup *memcg);
61
62/* for encoding cft->private value on file */
63enum res_type {
64 _MEM,
65 _MEMSWAP,
66 _KMEM,
67 _TCP,
68};
69
70bool memcg1_oom_prepare(struct mem_cgroup *memcg, bool *locked);
71void memcg1_oom_finish(struct mem_cgroup *memcg, bool locked);
72void memcg1_oom_recover(struct mem_cgroup *memcg);
73
74void memcg1_commit_charge(struct folio *folio, struct mem_cgroup *memcg);
75void memcg1_uncharge_batch(struct mem_cgroup *memcg, unsigned long pgpgout,
76 unsigned long nr_memory, int nid);
77
78void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s);
79
80void memcg1_account_kmem(struct mem_cgroup *memcg, int nr_pages);
81static inline bool memcg1_tcpmem_active(struct mem_cgroup *memcg)
82{
83 return memcg->tcpmem_active;
84}
85bool memcg1_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages,
86 gfp_t gfp_mask);
87static inline void memcg1_uncharge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages)
88{
89 page_counter_uncharge(counter: &memcg->tcpmem, nr_pages);
90}
91
92extern struct cftype memsw_files[];
93extern struct cftype mem_cgroup_legacy_files[];
94
95#else /* CONFIG_MEMCG_V1 */
96
97static inline bool do_memsw_account(void) { return false; }
98static inline bool memcg1_alloc_events(struct mem_cgroup *memcg) { return true; }
99static inline void memcg1_free_events(struct mem_cgroup *memcg) {}
100
101static inline void memcg1_memcg_init(struct mem_cgroup *memcg) {}
102static inline void memcg1_remove_from_trees(struct mem_cgroup *memcg) {}
103static inline void memcg1_soft_limit_reset(struct mem_cgroup *memcg) {}
104static inline void memcg1_css_offline(struct mem_cgroup *memcg) {}
105
106static inline bool memcg1_oom_prepare(struct mem_cgroup *memcg, bool *locked) { return true; }
107static inline void memcg1_oom_finish(struct mem_cgroup *memcg, bool locked) {}
108static inline void memcg1_oom_recover(struct mem_cgroup *memcg) {}
109
110static inline void memcg1_commit_charge(struct folio *folio,
111 struct mem_cgroup *memcg) {}
112
113static inline void memcg1_uncharge_batch(struct mem_cgroup *memcg,
114 unsigned long pgpgout,
115 unsigned long nr_memory, int nid) {}
116
117static inline void memcg1_stat_format(struct mem_cgroup *memcg, struct seq_buf *s) {}
118
119static inline void memcg1_account_kmem(struct mem_cgroup *memcg, int nr_pages) {}
120static inline bool memcg1_tcpmem_active(struct mem_cgroup *memcg) { return false; }
121static inline bool memcg1_charge_skmem(struct mem_cgroup *memcg, unsigned int nr_pages,
122 gfp_t gfp_mask) { return true; }
123static 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

source code of linux/mm/memcontrol-v1.h