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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
8fa3ed80 DZ |
2 | #ifndef _MM_PERCPU_INTERNAL_H |
3 | #define _MM_PERCPU_INTERNAL_H | |
4 | ||
5 | #include <linux/types.h> | |
6 | #include <linux/percpu.h> | |
2ef8ed7d | 7 | #include <linux/memcontrol.h> |
8fa3ed80 | 8 | |
ca460b3c DZF |
9 | /* |
10 | * pcpu_block_md is the metadata block struct. | |
11 | * Each chunk's bitmap is split into a number of full blocks. | |
12 | * All units are in terms of bits. | |
382b88e9 DZ |
13 | * |
14 | * The scan hint is the largest known contiguous area before the contig hint. | |
15 | * It is not necessarily the actual largest contig hint though. There is an | |
16 | * invariant that the scan_hint_start > contig_hint_start iff | |
17 | * scan_hint == contig_hint. This is necessary because when scanning forward, | |
18 | * we don't know if a new contig hint would be better than the current one. | |
ca460b3c DZF |
19 | */ |
20 | struct pcpu_block_md { | |
382b88e9 DZ |
21 | int scan_hint; /* scan hint for block */ |
22 | int scan_hint_start; /* block relative starting | |
23 | position of the scan hint */ | |
ca460b3c DZF |
24 | int contig_hint; /* contig hint for block */ |
25 | int contig_hint_start; /* block relative starting | |
26 | position of the contig hint */ | |
27 | int left_free; /* size of free space along | |
28 | the left side of the block */ | |
29 | int right_free; /* size of free space along | |
30 | the right side of the block */ | |
31 | int first_free; /* block position of first free */ | |
047924c9 | 32 | int nr_bits; /* total bits responsible for */ |
ca460b3c DZF |
33 | }; |
34 | ||
8fa3ed80 | 35 | struct pcpu_chunk { |
30a5b536 DZ |
36 | #ifdef CONFIG_PERCPU_STATS |
37 | int nr_alloc; /* # of allocations */ | |
38 | size_t max_alloc_size; /* largest allocation size */ | |
39 | #endif | |
40 | ||
8fa3ed80 | 41 | struct list_head list; /* linked to pcpu_slot lists */ |
40064aec | 42 | int free_bytes; /* free bytes in the chunk */ |
92c14cab | 43 | struct pcpu_block_md chunk_md; |
8fa3ed80 DZ |
44 | void *base_addr; /* base address of this chunk */ |
45 | ||
40064aec DZF |
46 | unsigned long *alloc_map; /* allocation map */ |
47 | unsigned long *bound_map; /* boundary map */ | |
ca460b3c | 48 | struct pcpu_block_md *md_blocks; /* metadata blocks */ |
8fa3ed80 DZ |
49 | |
50 | void *data; /* chunk data */ | |
8fa3ed80 | 51 | bool immutable; /* no [de]population allowed */ |
f1833241 RG |
52 | bool isolated; /* isolated from active chunk |
53 | slots */ | |
e2266705 DZF |
54 | int start_offset; /* the overlap with the previous |
55 | region to have a page aligned | |
56 | base_addr */ | |
6b9d7c8e DZF |
57 | int end_offset; /* additional area required to |
58 | have the region end page | |
59 | aligned */ | |
3c7be18a RG |
60 | #ifdef CONFIG_MEMCG_KMEM |
61 | struct obj_cgroup **obj_cgroups; /* vector of object cgroups */ | |
62 | #endif | |
c0ebfdc3 DZF |
63 | |
64 | int nr_pages; /* # of pages served by this chunk */ | |
8fa3ed80 | 65 | int nr_populated; /* # of populated pages */ |
0cecf50c | 66 | int nr_empty_pop_pages; /* # of empty populated pages */ |
8fa3ed80 DZ |
67 | unsigned long populated[]; /* populated bitmap */ |
68 | }; | |
69 | ||
70 | extern spinlock_t pcpu_lock; | |
71 | ||
3c7be18a | 72 | extern struct list_head *pcpu_chunk_lists; |
8fa3ed80 | 73 | extern int pcpu_nr_slots; |
f1833241 RG |
74 | extern int pcpu_sidelined_slot; |
75 | extern int pcpu_to_depopulate_slot; | |
faf65dde | 76 | extern int pcpu_nr_empty_pop_pages; |
8fa3ed80 DZ |
77 | |
78 | extern struct pcpu_chunk *pcpu_first_chunk; | |
79 | extern struct pcpu_chunk *pcpu_reserved_chunk; | |
80 | ||
ca460b3c DZF |
81 | /** |
82 | * pcpu_chunk_nr_blocks - converts nr_pages to # of md_blocks | |
83 | * @chunk: chunk of interest | |
84 | * | |
85 | * This conversion is from the number of physical pages that the chunk | |
86 | * serves to the number of bitmap blocks used. | |
87 | */ | |
88 | static inline int pcpu_chunk_nr_blocks(struct pcpu_chunk *chunk) | |
89 | { | |
90 | return chunk->nr_pages * PAGE_SIZE / PCPU_BITMAP_BLOCK_SIZE; | |
91 | } | |
92 | ||
40064aec DZF |
93 | /** |
94 | * pcpu_nr_pages_to_map_bits - converts the pages to size of bitmap | |
95 | * @pages: number of physical pages | |
96 | * | |
97 | * This conversion is from physical pages to the number of bits | |
98 | * required in the bitmap. | |
99 | */ | |
100 | static inline int pcpu_nr_pages_to_map_bits(int pages) | |
101 | { | |
102 | return pages * PAGE_SIZE / PCPU_MIN_ALLOC_SIZE; | |
103 | } | |
104 | ||
105 | /** | |
106 | * pcpu_chunk_map_bits - helper to convert nr_pages to size of bitmap | |
107 | * @chunk: chunk of interest | |
108 | * | |
109 | * This conversion is from the number of physical pages that the chunk | |
110 | * serves to the number of bits in the bitmap. | |
111 | */ | |
112 | static inline int pcpu_chunk_map_bits(struct pcpu_chunk *chunk) | |
113 | { | |
114 | return pcpu_nr_pages_to_map_bits(chunk->nr_pages); | |
115 | } | |
116 | ||
8c57c077 QZ |
117 | /** |
118 | * pcpu_obj_full_size - helper to calculate size of each accounted object | |
119 | * @size: size of area to allocate in bytes | |
120 | * | |
121 | * For each accounted object there is an extra space which is used to store | |
2ef8ed7d | 122 | * obj_cgroup membership if kmemcg is not disabled. Charge it too. |
8c57c077 QZ |
123 | */ |
124 | static inline size_t pcpu_obj_full_size(size_t size) | |
125 | { | |
f67bed13 | 126 | size_t extra_size = 0; |
8c57c077 | 127 | |
f67bed13 | 128 | #ifdef CONFIG_MEMCG_KMEM |
2ef8ed7d YS |
129 | if (!mem_cgroup_kmem_disabled()) |
130 | extra_size += size / PCPU_MIN_ALLOC_SIZE * sizeof(struct obj_cgroup *); | |
f67bed13 | 131 | #endif |
8c57c077 QZ |
132 | |
133 | return size * num_possible_cpus() + extra_size; | |
134 | } | |
8c57c077 | 135 | |
30a5b536 DZ |
136 | #ifdef CONFIG_PERCPU_STATS |
137 | ||
138 | #include <linux/spinlock.h> | |
139 | ||
140 | struct percpu_stats { | |
141 | u64 nr_alloc; /* lifetime # of allocations */ | |
142 | u64 nr_dealloc; /* lifetime # of deallocations */ | |
143 | u64 nr_cur_alloc; /* current # of allocations */ | |
144 | u64 nr_max_alloc; /* max # of live allocations */ | |
145 | u32 nr_chunks; /* current # of live chunks */ | |
146 | u32 nr_max_chunks; /* max # of live chunks */ | |
f0953a1b | 147 | size_t min_alloc_size; /* min allocation size */ |
30a5b536 DZ |
148 | size_t max_alloc_size; /* max allocation size */ |
149 | }; | |
150 | ||
151 | extern struct percpu_stats pcpu_stats; | |
152 | extern struct pcpu_alloc_info pcpu_stats_ai; | |
153 | ||
154 | /* | |
155 | * For debug purposes. We don't care about the flexible array. | |
156 | */ | |
157 | static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai) | |
158 | { | |
159 | memcpy(&pcpu_stats_ai, ai, sizeof(struct pcpu_alloc_info)); | |
160 | ||
161 | /* initialize min_alloc_size to unit_size */ | |
162 | pcpu_stats.min_alloc_size = pcpu_stats_ai.unit_size; | |
163 | } | |
164 | ||
165 | /* | |
166 | * pcpu_stats_area_alloc - increment area allocation stats | |
167 | * @chunk: the location of the area being allocated | |
168 | * @size: size of area to allocate in bytes | |
169 | * | |
170 | * CONTEXT: | |
171 | * pcpu_lock. | |
172 | */ | |
173 | static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size) | |
174 | { | |
175 | lockdep_assert_held(&pcpu_lock); | |
176 | ||
177 | pcpu_stats.nr_alloc++; | |
178 | pcpu_stats.nr_cur_alloc++; | |
179 | pcpu_stats.nr_max_alloc = | |
180 | max(pcpu_stats.nr_max_alloc, pcpu_stats.nr_cur_alloc); | |
181 | pcpu_stats.min_alloc_size = | |
182 | min(pcpu_stats.min_alloc_size, size); | |
183 | pcpu_stats.max_alloc_size = | |
184 | max(pcpu_stats.max_alloc_size, size); | |
185 | ||
186 | chunk->nr_alloc++; | |
187 | chunk->max_alloc_size = max(chunk->max_alloc_size, size); | |
188 | } | |
189 | ||
190 | /* | |
191 | * pcpu_stats_area_dealloc - decrement allocation stats | |
192 | * @chunk: the location of the area being deallocated | |
193 | * | |
194 | * CONTEXT: | |
195 | * pcpu_lock. | |
196 | */ | |
197 | static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk) | |
198 | { | |
199 | lockdep_assert_held(&pcpu_lock); | |
200 | ||
201 | pcpu_stats.nr_dealloc++; | |
202 | pcpu_stats.nr_cur_alloc--; | |
203 | ||
204 | chunk->nr_alloc--; | |
205 | } | |
206 | ||
207 | /* | |
208 | * pcpu_stats_chunk_alloc - increment chunk stats | |
209 | */ | |
210 | static inline void pcpu_stats_chunk_alloc(void) | |
211 | { | |
303abfdf DZ |
212 | unsigned long flags; |
213 | spin_lock_irqsave(&pcpu_lock, flags); | |
30a5b536 DZ |
214 | |
215 | pcpu_stats.nr_chunks++; | |
216 | pcpu_stats.nr_max_chunks = | |
217 | max(pcpu_stats.nr_max_chunks, pcpu_stats.nr_chunks); | |
218 | ||
303abfdf | 219 | spin_unlock_irqrestore(&pcpu_lock, flags); |
30a5b536 DZ |
220 | } |
221 | ||
222 | /* | |
223 | * pcpu_stats_chunk_dealloc - decrement chunk stats | |
224 | */ | |
225 | static inline void pcpu_stats_chunk_dealloc(void) | |
226 | { | |
303abfdf DZ |
227 | unsigned long flags; |
228 | spin_lock_irqsave(&pcpu_lock, flags); | |
30a5b536 DZ |
229 | |
230 | pcpu_stats.nr_chunks--; | |
231 | ||
303abfdf | 232 | spin_unlock_irqrestore(&pcpu_lock, flags); |
30a5b536 DZ |
233 | } |
234 | ||
235 | #else | |
236 | ||
237 | static inline void pcpu_stats_save_ai(const struct pcpu_alloc_info *ai) | |
238 | { | |
239 | } | |
240 | ||
241 | static inline void pcpu_stats_area_alloc(struct pcpu_chunk *chunk, size_t size) | |
242 | { | |
243 | } | |
244 | ||
245 | static inline void pcpu_stats_area_dealloc(struct pcpu_chunk *chunk) | |
246 | { | |
247 | } | |
248 | ||
249 | static inline void pcpu_stats_chunk_alloc(void) | |
250 | { | |
251 | } | |
252 | ||
253 | static inline void pcpu_stats_chunk_dealloc(void) | |
254 | { | |
255 | } | |
256 | ||
257 | #endif /* !CONFIG_PERCPU_STATS */ | |
258 | ||
8fa3ed80 | 259 | #endif |