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1da177e4 LT |
1 | #ifndef _LINUX_CPUSET_H |
2 | #define _LINUX_CPUSET_H | |
3 | /* | |
4 | * cpuset interface | |
5 | * | |
6 | * Copyright (C) 2003 BULL SA | |
825a46af | 7 | * Copyright (C) 2004-2006 Silicon Graphics, Inc. |
1da177e4 LT |
8 | * |
9 | */ | |
10 | ||
11 | #include <linux/sched.h> | |
105ab3d8 | 12 | #include <linux/sched/topology.h> |
f719ff9b | 13 | #include <linux/sched/task.h> |
1da177e4 LT |
14 | #include <linux/cpumask.h> |
15 | #include <linux/nodemask.h> | |
a1bc5a4e | 16 | #include <linux/mm.h> |
664eedde | 17 | #include <linux/jump_label.h> |
1da177e4 LT |
18 | |
19 | #ifdef CONFIG_CPUSETS | |
20 | ||
002f2906 | 21 | extern struct static_key_false cpusets_enabled_key; |
664eedde MG |
22 | static inline bool cpusets_enabled(void) |
23 | { | |
002f2906 | 24 | return static_branch_unlikely(&cpusets_enabled_key); |
664eedde MG |
25 | } |
26 | ||
27 | static inline int nr_cpusets(void) | |
28 | { | |
29 | /* jump label reference count + the top-level cpuset */ | |
002f2906 | 30 | return static_key_count(&cpusets_enabled_key.key) + 1; |
664eedde MG |
31 | } |
32 | ||
33 | static inline void cpuset_inc(void) | |
34 | { | |
002f2906 | 35 | static_branch_inc(&cpusets_enabled_key); |
664eedde MG |
36 | } |
37 | ||
38 | static inline void cpuset_dec(void) | |
39 | { | |
002f2906 | 40 | static_branch_dec(&cpusets_enabled_key); |
664eedde | 41 | } |
202f72d5 | 42 | |
1da177e4 LT |
43 | extern int cpuset_init(void); |
44 | extern void cpuset_init_smp(void); | |
30e03acd | 45 | extern void cpuset_update_active_cpus(void); |
6af866af | 46 | extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask); |
2baab4e9 | 47 | extern void cpuset_cpus_allowed_fallback(struct task_struct *p); |
909d75a3 | 48 | extern nodemask_t cpuset_mems_allowed(struct task_struct *p); |
9276b1bc | 49 | #define cpuset_current_mems_allowed (current->mems_allowed) |
1da177e4 | 50 | void cpuset_init_current_mems_allowed(void); |
19770b32 | 51 | int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask); |
202f72d5 | 52 | |
002f2906 | 53 | extern bool __cpuset_node_allowed(int node, gfp_t gfp_mask); |
02a0e53d | 54 | |
002f2906 | 55 | static inline bool cpuset_node_allowed(int node, gfp_t gfp_mask) |
02a0e53d | 56 | { |
002f2906 VB |
57 | if (cpusets_enabled()) |
58 | return __cpuset_node_allowed(node, gfp_mask); | |
59 | return true; | |
02a0e53d PJ |
60 | } |
61 | ||
002f2906 | 62 | static inline bool __cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask) |
202f72d5 | 63 | { |
002f2906 VB |
64 | return __cpuset_node_allowed(zone_to_nid(z), gfp_mask); |
65 | } | |
66 | ||
67 | static inline bool cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask) | |
68 | { | |
69 | if (cpusets_enabled()) | |
70 | return __cpuset_zone_allowed(z, gfp_mask); | |
71 | return true; | |
202f72d5 PJ |
72 | } |
73 | ||
bbe373f2 DR |
74 | extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, |
75 | const struct task_struct *tsk2); | |
3e0d98b9 PJ |
76 | |
77 | #define cpuset_memory_pressure_bump() \ | |
78 | do { \ | |
79 | if (cpuset_memory_pressure_enabled) \ | |
80 | __cpuset_memory_pressure_bump(); \ | |
81 | } while (0) | |
82 | extern int cpuset_memory_pressure_enabled; | |
83 | extern void __cpuset_memory_pressure_bump(void); | |
84 | ||
df5f8314 EB |
85 | extern void cpuset_task_status_allowed(struct seq_file *m, |
86 | struct task_struct *task); | |
52de4779 ZL |
87 | extern int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns, |
88 | struct pid *pid, struct task_struct *tsk); | |
1da177e4 | 89 | |
825a46af | 90 | extern int cpuset_mem_spread_node(void); |
6adef3eb | 91 | extern int cpuset_slab_spread_node(void); |
825a46af PJ |
92 | |
93 | static inline int cpuset_do_page_mem_spread(void) | |
94 | { | |
2ad654bc | 95 | return task_spread_page(current); |
825a46af PJ |
96 | } |
97 | ||
98 | static inline int cpuset_do_slab_mem_spread(void) | |
99 | { | |
2ad654bc | 100 | return task_spread_slab(current); |
825a46af PJ |
101 | } |
102 | ||
8793d854 PM |
103 | extern int current_cpuset_is_being_rebound(void); |
104 | ||
e761b772 MK |
105 | extern void rebuild_sched_domains(void); |
106 | ||
da39da3a | 107 | extern void cpuset_print_current_mems_allowed(void); |
75aa1994 | 108 | |
c0ff7453 | 109 | /* |
d26914d1 MG |
110 | * read_mems_allowed_begin is required when making decisions involving |
111 | * mems_allowed such as during page allocation. mems_allowed can be updated in | |
112 | * parallel and depending on the new value an operation can fail potentially | |
113 | * causing process failure. A retry loop with read_mems_allowed_begin and | |
114 | * read_mems_allowed_retry prevents these artificial failures. | |
c0ff7453 | 115 | */ |
d26914d1 | 116 | static inline unsigned int read_mems_allowed_begin(void) |
c0ff7453 | 117 | { |
46e700ab MG |
118 | if (!cpusets_enabled()) |
119 | return 0; | |
120 | ||
cc9a6c87 | 121 | return read_seqcount_begin(¤t->mems_allowed_seq); |
c0ff7453 MX |
122 | } |
123 | ||
cc9a6c87 | 124 | /* |
d26914d1 MG |
125 | * If this returns true, the operation that took place after |
126 | * read_mems_allowed_begin may have failed artificially due to a concurrent | |
127 | * update of mems_allowed. It is up to the caller to retry the operation if | |
cc9a6c87 MG |
128 | * appropriate. |
129 | */ | |
d26914d1 | 130 | static inline bool read_mems_allowed_retry(unsigned int seq) |
c0ff7453 | 131 | { |
46e700ab MG |
132 | if (!cpusets_enabled()) |
133 | return false; | |
134 | ||
d26914d1 | 135 | return read_seqcount_retry(¤t->mems_allowed_seq, seq); |
c0ff7453 MX |
136 | } |
137 | ||
58568d2a MX |
138 | static inline void set_mems_allowed(nodemask_t nodemask) |
139 | { | |
db751fe3 JS |
140 | unsigned long flags; |
141 | ||
c0ff7453 | 142 | task_lock(current); |
db751fe3 | 143 | local_irq_save(flags); |
cc9a6c87 | 144 | write_seqcount_begin(¤t->mems_allowed_seq); |
58568d2a | 145 | current->mems_allowed = nodemask; |
cc9a6c87 | 146 | write_seqcount_end(¤t->mems_allowed_seq); |
db751fe3 | 147 | local_irq_restore(flags); |
c0ff7453 | 148 | task_unlock(current); |
58568d2a MX |
149 | } |
150 | ||
1da177e4 LT |
151 | #else /* !CONFIG_CPUSETS */ |
152 | ||
664eedde MG |
153 | static inline bool cpusets_enabled(void) { return false; } |
154 | ||
1da177e4 LT |
155 | static inline int cpuset_init(void) { return 0; } |
156 | static inline void cpuset_init_smp(void) {} | |
1da177e4 | 157 | |
30e03acd | 158 | static inline void cpuset_update_active_cpus(void) |
3a101d05 TH |
159 | { |
160 | partition_sched_domains(1, NULL, NULL); | |
161 | } | |
162 | ||
6af866af LZ |
163 | static inline void cpuset_cpus_allowed(struct task_struct *p, |
164 | struct cpumask *mask) | |
1da177e4 | 165 | { |
aa85ea5b | 166 | cpumask_copy(mask, cpu_possible_mask); |
1da177e4 LT |
167 | } |
168 | ||
2baab4e9 | 169 | static inline void cpuset_cpus_allowed_fallback(struct task_struct *p) |
9084bb82 | 170 | { |
9084bb82 ON |
171 | } |
172 | ||
909d75a3 PJ |
173 | static inline nodemask_t cpuset_mems_allowed(struct task_struct *p) |
174 | { | |
175 | return node_possible_map; | |
176 | } | |
177 | ||
38d7bee9 | 178 | #define cpuset_current_mems_allowed (node_states[N_MEMORY]) |
1da177e4 | 179 | static inline void cpuset_init_current_mems_allowed(void) {} |
1da177e4 | 180 | |
19770b32 | 181 | static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask) |
1da177e4 LT |
182 | { |
183 | return 1; | |
184 | } | |
185 | ||
002f2906 | 186 | static inline bool cpuset_node_allowed(int node, gfp_t gfp_mask) |
02a0e53d | 187 | { |
002f2906 | 188 | return true; |
02a0e53d PJ |
189 | } |
190 | ||
002f2906 | 191 | static inline bool __cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask) |
1da177e4 | 192 | { |
002f2906 VB |
193 | return true; |
194 | } | |
195 | ||
196 | static inline bool cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask) | |
197 | { | |
198 | return true; | |
1da177e4 LT |
199 | } |
200 | ||
bbe373f2 DR |
201 | static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, |
202 | const struct task_struct *tsk2) | |
ef08e3b4 PJ |
203 | { |
204 | return 1; | |
205 | } | |
206 | ||
3e0d98b9 PJ |
207 | static inline void cpuset_memory_pressure_bump(void) {} |
208 | ||
df5f8314 EB |
209 | static inline void cpuset_task_status_allowed(struct seq_file *m, |
210 | struct task_struct *task) | |
1da177e4 | 211 | { |
1da177e4 LT |
212 | } |
213 | ||
825a46af PJ |
214 | static inline int cpuset_mem_spread_node(void) |
215 | { | |
216 | return 0; | |
217 | } | |
218 | ||
6adef3eb JS |
219 | static inline int cpuset_slab_spread_node(void) |
220 | { | |
221 | return 0; | |
222 | } | |
223 | ||
825a46af PJ |
224 | static inline int cpuset_do_page_mem_spread(void) |
225 | { | |
226 | return 0; | |
227 | } | |
228 | ||
229 | static inline int cpuset_do_slab_mem_spread(void) | |
230 | { | |
231 | return 0; | |
232 | } | |
233 | ||
8793d854 PM |
234 | static inline int current_cpuset_is_being_rebound(void) |
235 | { | |
236 | return 0; | |
237 | } | |
238 | ||
e761b772 MK |
239 | static inline void rebuild_sched_domains(void) |
240 | { | |
dfb512ec | 241 | partition_sched_domains(1, NULL, NULL); |
e761b772 MK |
242 | } |
243 | ||
da39da3a | 244 | static inline void cpuset_print_current_mems_allowed(void) |
75aa1994 DR |
245 | { |
246 | } | |
247 | ||
58568d2a MX |
248 | static inline void set_mems_allowed(nodemask_t nodemask) |
249 | { | |
250 | } | |
251 | ||
d26914d1 | 252 | static inline unsigned int read_mems_allowed_begin(void) |
c0ff7453 | 253 | { |
cc9a6c87 | 254 | return 0; |
c0ff7453 MX |
255 | } |
256 | ||
d26914d1 | 257 | static inline bool read_mems_allowed_retry(unsigned int seq) |
c0ff7453 | 258 | { |
d26914d1 | 259 | return false; |
c0ff7453 MX |
260 | } |
261 | ||
1da177e4 LT |
262 | #endif /* !CONFIG_CPUSETS */ |
263 | ||
264 | #endif /* _LINUX_CPUSET_H */ |