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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> |
1da177e4 LT |
13 | #include <linux/cpumask.h> |
14 | #include <linux/nodemask.h> | |
a1bc5a4e | 15 | #include <linux/mm.h> |
664eedde | 16 | #include <linux/jump_label.h> |
1da177e4 LT |
17 | |
18 | #ifdef CONFIG_CPUSETS | |
19 | ||
002f2906 | 20 | extern struct static_key_false cpusets_enabled_key; |
664eedde MG |
21 | static inline bool cpusets_enabled(void) |
22 | { | |
002f2906 | 23 | return static_branch_unlikely(&cpusets_enabled_key); |
664eedde MG |
24 | } |
25 | ||
26 | static inline int nr_cpusets(void) | |
27 | { | |
28 | /* jump label reference count + the top-level cpuset */ | |
002f2906 | 29 | return static_key_count(&cpusets_enabled_key.key) + 1; |
664eedde MG |
30 | } |
31 | ||
32 | static inline void cpuset_inc(void) | |
33 | { | |
002f2906 | 34 | static_branch_inc(&cpusets_enabled_key); |
664eedde MG |
35 | } |
36 | ||
37 | static inline void cpuset_dec(void) | |
38 | { | |
002f2906 | 39 | static_branch_dec(&cpusets_enabled_key); |
664eedde | 40 | } |
202f72d5 | 41 | |
1da177e4 LT |
42 | extern int cpuset_init(void); |
43 | extern void cpuset_init_smp(void); | |
7ddf96b0 | 44 | extern void cpuset_update_active_cpus(bool cpu_online); |
6af866af | 45 | extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask); |
2baab4e9 | 46 | extern void cpuset_cpus_allowed_fallback(struct task_struct *p); |
909d75a3 | 47 | extern nodemask_t cpuset_mems_allowed(struct task_struct *p); |
9276b1bc | 48 | #define cpuset_current_mems_allowed (current->mems_allowed) |
1da177e4 | 49 | void cpuset_init_current_mems_allowed(void); |
19770b32 | 50 | int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask); |
202f72d5 | 51 | |
002f2906 | 52 | extern bool __cpuset_node_allowed(int node, gfp_t gfp_mask); |
02a0e53d | 53 | |
002f2906 | 54 | static inline bool cpuset_node_allowed(int node, gfp_t gfp_mask) |
02a0e53d | 55 | { |
002f2906 VB |
56 | if (cpusets_enabled()) |
57 | return __cpuset_node_allowed(node, gfp_mask); | |
58 | return true; | |
02a0e53d PJ |
59 | } |
60 | ||
002f2906 | 61 | static inline bool __cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask) |
202f72d5 | 62 | { |
002f2906 VB |
63 | return __cpuset_node_allowed(zone_to_nid(z), gfp_mask); |
64 | } | |
65 | ||
66 | static inline bool cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask) | |
67 | { | |
68 | if (cpusets_enabled()) | |
69 | return __cpuset_zone_allowed(z, gfp_mask); | |
70 | return true; | |
202f72d5 PJ |
71 | } |
72 | ||
bbe373f2 DR |
73 | extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, |
74 | const struct task_struct *tsk2); | |
3e0d98b9 PJ |
75 | |
76 | #define cpuset_memory_pressure_bump() \ | |
77 | do { \ | |
78 | if (cpuset_memory_pressure_enabled) \ | |
79 | __cpuset_memory_pressure_bump(); \ | |
80 | } while (0) | |
81 | extern int cpuset_memory_pressure_enabled; | |
82 | extern void __cpuset_memory_pressure_bump(void); | |
83 | ||
df5f8314 EB |
84 | extern void cpuset_task_status_allowed(struct seq_file *m, |
85 | struct task_struct *task); | |
52de4779 ZL |
86 | extern int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns, |
87 | struct pid *pid, struct task_struct *tsk); | |
1da177e4 | 88 | |
825a46af | 89 | extern int cpuset_mem_spread_node(void); |
6adef3eb | 90 | extern int cpuset_slab_spread_node(void); |
825a46af PJ |
91 | |
92 | static inline int cpuset_do_page_mem_spread(void) | |
93 | { | |
2ad654bc | 94 | return task_spread_page(current); |
825a46af PJ |
95 | } |
96 | ||
97 | static inline int cpuset_do_slab_mem_spread(void) | |
98 | { | |
2ad654bc | 99 | return task_spread_slab(current); |
825a46af PJ |
100 | } |
101 | ||
8793d854 PM |
102 | extern int current_cpuset_is_being_rebound(void); |
103 | ||
e761b772 MK |
104 | extern void rebuild_sched_domains(void); |
105 | ||
da39da3a | 106 | extern void cpuset_print_current_mems_allowed(void); |
75aa1994 | 107 | |
c0ff7453 | 108 | /* |
d26914d1 MG |
109 | * read_mems_allowed_begin is required when making decisions involving |
110 | * mems_allowed such as during page allocation. mems_allowed can be updated in | |
111 | * parallel and depending on the new value an operation can fail potentially | |
112 | * causing process failure. A retry loop with read_mems_allowed_begin and | |
113 | * read_mems_allowed_retry prevents these artificial failures. | |
c0ff7453 | 114 | */ |
d26914d1 | 115 | static inline unsigned int read_mems_allowed_begin(void) |
c0ff7453 | 116 | { |
46e700ab MG |
117 | if (!cpusets_enabled()) |
118 | return 0; | |
119 | ||
cc9a6c87 | 120 | return read_seqcount_begin(¤t->mems_allowed_seq); |
c0ff7453 MX |
121 | } |
122 | ||
cc9a6c87 | 123 | /* |
d26914d1 MG |
124 | * If this returns true, the operation that took place after |
125 | * read_mems_allowed_begin may have failed artificially due to a concurrent | |
126 | * update of mems_allowed. It is up to the caller to retry the operation if | |
cc9a6c87 MG |
127 | * appropriate. |
128 | */ | |
d26914d1 | 129 | static inline bool read_mems_allowed_retry(unsigned int seq) |
c0ff7453 | 130 | { |
46e700ab MG |
131 | if (!cpusets_enabled()) |
132 | return false; | |
133 | ||
d26914d1 | 134 | return read_seqcount_retry(¤t->mems_allowed_seq, seq); |
c0ff7453 MX |
135 | } |
136 | ||
58568d2a MX |
137 | static inline void set_mems_allowed(nodemask_t nodemask) |
138 | { | |
db751fe3 JS |
139 | unsigned long flags; |
140 | ||
c0ff7453 | 141 | task_lock(current); |
db751fe3 | 142 | local_irq_save(flags); |
cc9a6c87 | 143 | write_seqcount_begin(¤t->mems_allowed_seq); |
58568d2a | 144 | current->mems_allowed = nodemask; |
cc9a6c87 | 145 | write_seqcount_end(¤t->mems_allowed_seq); |
db751fe3 | 146 | local_irq_restore(flags); |
c0ff7453 | 147 | task_unlock(current); |
58568d2a MX |
148 | } |
149 | ||
1da177e4 LT |
150 | #else /* !CONFIG_CPUSETS */ |
151 | ||
664eedde MG |
152 | static inline bool cpusets_enabled(void) { return false; } |
153 | ||
1da177e4 LT |
154 | static inline int cpuset_init(void) { return 0; } |
155 | static inline void cpuset_init_smp(void) {} | |
1da177e4 | 156 | |
7ddf96b0 | 157 | static inline void cpuset_update_active_cpus(bool cpu_online) |
3a101d05 TH |
158 | { |
159 | partition_sched_domains(1, NULL, NULL); | |
160 | } | |
161 | ||
6af866af LZ |
162 | static inline void cpuset_cpus_allowed(struct task_struct *p, |
163 | struct cpumask *mask) | |
1da177e4 | 164 | { |
aa85ea5b | 165 | cpumask_copy(mask, cpu_possible_mask); |
1da177e4 LT |
166 | } |
167 | ||
2baab4e9 | 168 | static inline void cpuset_cpus_allowed_fallback(struct task_struct *p) |
9084bb82 | 169 | { |
9084bb82 ON |
170 | } |
171 | ||
909d75a3 PJ |
172 | static inline nodemask_t cpuset_mems_allowed(struct task_struct *p) |
173 | { | |
174 | return node_possible_map; | |
175 | } | |
176 | ||
38d7bee9 | 177 | #define cpuset_current_mems_allowed (node_states[N_MEMORY]) |
1da177e4 | 178 | static inline void cpuset_init_current_mems_allowed(void) {} |
1da177e4 | 179 | |
19770b32 | 180 | static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask) |
1da177e4 LT |
181 | { |
182 | return 1; | |
183 | } | |
184 | ||
002f2906 | 185 | static inline bool cpuset_node_allowed(int node, gfp_t gfp_mask) |
02a0e53d | 186 | { |
002f2906 | 187 | return true; |
02a0e53d PJ |
188 | } |
189 | ||
002f2906 | 190 | static inline bool __cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask) |
1da177e4 | 191 | { |
002f2906 VB |
192 | return true; |
193 | } | |
194 | ||
195 | static inline bool cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask) | |
196 | { | |
197 | return true; | |
1da177e4 LT |
198 | } |
199 | ||
bbe373f2 DR |
200 | static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, |
201 | const struct task_struct *tsk2) | |
ef08e3b4 PJ |
202 | { |
203 | return 1; | |
204 | } | |
205 | ||
3e0d98b9 PJ |
206 | static inline void cpuset_memory_pressure_bump(void) {} |
207 | ||
df5f8314 EB |
208 | static inline void cpuset_task_status_allowed(struct seq_file *m, |
209 | struct task_struct *task) | |
1da177e4 | 210 | { |
1da177e4 LT |
211 | } |
212 | ||
825a46af PJ |
213 | static inline int cpuset_mem_spread_node(void) |
214 | { | |
215 | return 0; | |
216 | } | |
217 | ||
6adef3eb JS |
218 | static inline int cpuset_slab_spread_node(void) |
219 | { | |
220 | return 0; | |
221 | } | |
222 | ||
825a46af PJ |
223 | static inline int cpuset_do_page_mem_spread(void) |
224 | { | |
225 | return 0; | |
226 | } | |
227 | ||
228 | static inline int cpuset_do_slab_mem_spread(void) | |
229 | { | |
230 | return 0; | |
231 | } | |
232 | ||
8793d854 PM |
233 | static inline int current_cpuset_is_being_rebound(void) |
234 | { | |
235 | return 0; | |
236 | } | |
237 | ||
e761b772 MK |
238 | static inline void rebuild_sched_domains(void) |
239 | { | |
dfb512ec | 240 | partition_sched_domains(1, NULL, NULL); |
e761b772 MK |
241 | } |
242 | ||
da39da3a | 243 | static inline void cpuset_print_current_mems_allowed(void) |
75aa1994 DR |
244 | { |
245 | } | |
246 | ||
58568d2a MX |
247 | static inline void set_mems_allowed(nodemask_t nodemask) |
248 | { | |
249 | } | |
250 | ||
d26914d1 | 251 | static inline unsigned int read_mems_allowed_begin(void) |
c0ff7453 | 252 | { |
cc9a6c87 | 253 | return 0; |
c0ff7453 MX |
254 | } |
255 | ||
d26914d1 | 256 | static inline bool read_mems_allowed_retry(unsigned int seq) |
c0ff7453 | 257 | { |
d26914d1 | 258 | return false; |
c0ff7453 MX |
259 | } |
260 | ||
1da177e4 LT |
261 | #endif /* !CONFIG_CPUSETS */ |
262 | ||
263 | #endif /* _LINUX_CPUSET_H */ |