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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> | |
12 | #include <linux/cpumask.h> | |
13 | #include <linux/nodemask.h> | |
a1bc5a4e | 14 | #include <linux/mm.h> |
664eedde | 15 | #include <linux/jump_label.h> |
1da177e4 LT |
16 | |
17 | #ifdef CONFIG_CPUSETS | |
18 | ||
664eedde MG |
19 | extern struct static_key cpusets_enabled_key; |
20 | static inline bool cpusets_enabled(void) | |
21 | { | |
22 | return static_key_false(&cpusets_enabled_key); | |
23 | } | |
24 | ||
25 | static inline int nr_cpusets(void) | |
26 | { | |
27 | /* jump label reference count + the top-level cpuset */ | |
28 | return static_key_count(&cpusets_enabled_key) + 1; | |
29 | } | |
30 | ||
31 | static inline void cpuset_inc(void) | |
32 | { | |
33 | static_key_slow_inc(&cpusets_enabled_key); | |
34 | } | |
35 | ||
36 | static inline void cpuset_dec(void) | |
37 | { | |
38 | static_key_slow_dec(&cpusets_enabled_key); | |
39 | } | |
202f72d5 | 40 | |
1da177e4 LT |
41 | extern int cpuset_init(void); |
42 | extern void cpuset_init_smp(void); | |
7ddf96b0 | 43 | extern void cpuset_update_active_cpus(bool cpu_online); |
6af866af | 44 | extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask); |
2baab4e9 | 45 | extern void cpuset_cpus_allowed_fallback(struct task_struct *p); |
909d75a3 | 46 | extern nodemask_t cpuset_mems_allowed(struct task_struct *p); |
9276b1bc | 47 | #define cpuset_current_mems_allowed (current->mems_allowed) |
1da177e4 | 48 | void cpuset_init_current_mems_allowed(void); |
19770b32 | 49 | int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask); |
202f72d5 | 50 | |
344736f2 | 51 | extern int __cpuset_node_allowed(int node, gfp_t gfp_mask); |
02a0e53d | 52 | |
344736f2 | 53 | static inline int cpuset_node_allowed(int node, gfp_t gfp_mask) |
02a0e53d | 54 | { |
344736f2 | 55 | return nr_cpusets() <= 1 || __cpuset_node_allowed(node, gfp_mask); |
02a0e53d PJ |
56 | } |
57 | ||
344736f2 | 58 | static inline int cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask) |
202f72d5 | 59 | { |
344736f2 | 60 | return cpuset_node_allowed(zone_to_nid(z), gfp_mask); |
202f72d5 PJ |
61 | } |
62 | ||
bbe373f2 DR |
63 | extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, |
64 | const struct task_struct *tsk2); | |
3e0d98b9 PJ |
65 | |
66 | #define cpuset_memory_pressure_bump() \ | |
67 | do { \ | |
68 | if (cpuset_memory_pressure_enabled) \ | |
69 | __cpuset_memory_pressure_bump(); \ | |
70 | } while (0) | |
71 | extern int cpuset_memory_pressure_enabled; | |
72 | extern void __cpuset_memory_pressure_bump(void); | |
73 | ||
df5f8314 EB |
74 | extern void cpuset_task_status_allowed(struct seq_file *m, |
75 | struct task_struct *task); | |
52de4779 ZL |
76 | extern int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns, |
77 | struct pid *pid, struct task_struct *tsk); | |
1da177e4 | 78 | |
825a46af | 79 | extern int cpuset_mem_spread_node(void); |
6adef3eb | 80 | extern int cpuset_slab_spread_node(void); |
825a46af PJ |
81 | |
82 | static inline int cpuset_do_page_mem_spread(void) | |
83 | { | |
2ad654bc | 84 | return task_spread_page(current); |
825a46af PJ |
85 | } |
86 | ||
87 | static inline int cpuset_do_slab_mem_spread(void) | |
88 | { | |
2ad654bc | 89 | return task_spread_slab(current); |
825a46af PJ |
90 | } |
91 | ||
8793d854 PM |
92 | extern int current_cpuset_is_being_rebound(void); |
93 | ||
e761b772 MK |
94 | extern void rebuild_sched_domains(void); |
95 | ||
da39da3a | 96 | extern void cpuset_print_current_mems_allowed(void); |
75aa1994 | 97 | |
c0ff7453 | 98 | /* |
d26914d1 MG |
99 | * read_mems_allowed_begin is required when making decisions involving |
100 | * mems_allowed such as during page allocation. mems_allowed can be updated in | |
101 | * parallel and depending on the new value an operation can fail potentially | |
102 | * causing process failure. A retry loop with read_mems_allowed_begin and | |
103 | * read_mems_allowed_retry prevents these artificial failures. | |
c0ff7453 | 104 | */ |
d26914d1 | 105 | static inline unsigned int read_mems_allowed_begin(void) |
c0ff7453 | 106 | { |
46e700ab MG |
107 | if (!cpusets_enabled()) |
108 | return 0; | |
109 | ||
cc9a6c87 | 110 | return read_seqcount_begin(¤t->mems_allowed_seq); |
c0ff7453 MX |
111 | } |
112 | ||
cc9a6c87 | 113 | /* |
d26914d1 MG |
114 | * If this returns true, the operation that took place after |
115 | * read_mems_allowed_begin may have failed artificially due to a concurrent | |
116 | * update of mems_allowed. It is up to the caller to retry the operation if | |
cc9a6c87 MG |
117 | * appropriate. |
118 | */ | |
d26914d1 | 119 | static inline bool read_mems_allowed_retry(unsigned int seq) |
c0ff7453 | 120 | { |
46e700ab MG |
121 | if (!cpusets_enabled()) |
122 | return false; | |
123 | ||
d26914d1 | 124 | return read_seqcount_retry(¤t->mems_allowed_seq, seq); |
c0ff7453 MX |
125 | } |
126 | ||
58568d2a MX |
127 | static inline void set_mems_allowed(nodemask_t nodemask) |
128 | { | |
db751fe3 JS |
129 | unsigned long flags; |
130 | ||
c0ff7453 | 131 | task_lock(current); |
db751fe3 | 132 | local_irq_save(flags); |
cc9a6c87 | 133 | write_seqcount_begin(¤t->mems_allowed_seq); |
58568d2a | 134 | current->mems_allowed = nodemask; |
cc9a6c87 | 135 | write_seqcount_end(¤t->mems_allowed_seq); |
db751fe3 | 136 | local_irq_restore(flags); |
c0ff7453 | 137 | task_unlock(current); |
58568d2a MX |
138 | } |
139 | ||
1da177e4 LT |
140 | #else /* !CONFIG_CPUSETS */ |
141 | ||
664eedde MG |
142 | static inline bool cpusets_enabled(void) { return false; } |
143 | ||
1da177e4 LT |
144 | static inline int cpuset_init(void) { return 0; } |
145 | static inline void cpuset_init_smp(void) {} | |
1da177e4 | 146 | |
7ddf96b0 | 147 | static inline void cpuset_update_active_cpus(bool cpu_online) |
3a101d05 TH |
148 | { |
149 | partition_sched_domains(1, NULL, NULL); | |
150 | } | |
151 | ||
6af866af LZ |
152 | static inline void cpuset_cpus_allowed(struct task_struct *p, |
153 | struct cpumask *mask) | |
1da177e4 | 154 | { |
aa85ea5b | 155 | cpumask_copy(mask, cpu_possible_mask); |
1da177e4 LT |
156 | } |
157 | ||
2baab4e9 | 158 | static inline void cpuset_cpus_allowed_fallback(struct task_struct *p) |
9084bb82 | 159 | { |
9084bb82 ON |
160 | } |
161 | ||
909d75a3 PJ |
162 | static inline nodemask_t cpuset_mems_allowed(struct task_struct *p) |
163 | { | |
164 | return node_possible_map; | |
165 | } | |
166 | ||
38d7bee9 | 167 | #define cpuset_current_mems_allowed (node_states[N_MEMORY]) |
1da177e4 | 168 | static inline void cpuset_init_current_mems_allowed(void) {} |
1da177e4 | 169 | |
19770b32 | 170 | static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask) |
1da177e4 LT |
171 | { |
172 | return 1; | |
173 | } | |
174 | ||
344736f2 | 175 | static inline int cpuset_node_allowed(int node, gfp_t gfp_mask) |
02a0e53d PJ |
176 | { |
177 | return 1; | |
178 | } | |
179 | ||
344736f2 | 180 | static inline int cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask) |
1da177e4 LT |
181 | { |
182 | return 1; | |
183 | } | |
184 | ||
bbe373f2 DR |
185 | static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, |
186 | const struct task_struct *tsk2) | |
ef08e3b4 PJ |
187 | { |
188 | return 1; | |
189 | } | |
190 | ||
3e0d98b9 PJ |
191 | static inline void cpuset_memory_pressure_bump(void) {} |
192 | ||
df5f8314 EB |
193 | static inline void cpuset_task_status_allowed(struct seq_file *m, |
194 | struct task_struct *task) | |
1da177e4 | 195 | { |
1da177e4 LT |
196 | } |
197 | ||
825a46af PJ |
198 | static inline int cpuset_mem_spread_node(void) |
199 | { | |
200 | return 0; | |
201 | } | |
202 | ||
6adef3eb JS |
203 | static inline int cpuset_slab_spread_node(void) |
204 | { | |
205 | return 0; | |
206 | } | |
207 | ||
825a46af PJ |
208 | static inline int cpuset_do_page_mem_spread(void) |
209 | { | |
210 | return 0; | |
211 | } | |
212 | ||
213 | static inline int cpuset_do_slab_mem_spread(void) | |
214 | { | |
215 | return 0; | |
216 | } | |
217 | ||
8793d854 PM |
218 | static inline int current_cpuset_is_being_rebound(void) |
219 | { | |
220 | return 0; | |
221 | } | |
222 | ||
e761b772 MK |
223 | static inline void rebuild_sched_domains(void) |
224 | { | |
dfb512ec | 225 | partition_sched_domains(1, NULL, NULL); |
e761b772 MK |
226 | } |
227 | ||
da39da3a | 228 | static inline void cpuset_print_current_mems_allowed(void) |
75aa1994 DR |
229 | { |
230 | } | |
231 | ||
58568d2a MX |
232 | static inline void set_mems_allowed(nodemask_t nodemask) |
233 | { | |
234 | } | |
235 | ||
d26914d1 | 236 | static inline unsigned int read_mems_allowed_begin(void) |
c0ff7453 | 237 | { |
cc9a6c87 | 238 | return 0; |
c0ff7453 MX |
239 | } |
240 | ||
d26914d1 | 241 | static inline bool read_mems_allowed_retry(unsigned int seq) |
c0ff7453 | 242 | { |
d26914d1 | 243 | return false; |
c0ff7453 MX |
244 | } |
245 | ||
1da177e4 LT |
246 | #endif /* !CONFIG_CPUSETS */ |
247 | ||
248 | #endif /* _LINUX_CPUSET_H */ |