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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 | ||
75aa1994 DR |
96 | extern void cpuset_print_task_mems_allowed(struct task_struct *p); |
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 | { |
cc9a6c87 | 107 | return read_seqcount_begin(¤t->mems_allowed_seq); |
c0ff7453 MX |
108 | } |
109 | ||
cc9a6c87 | 110 | /* |
d26914d1 MG |
111 | * If this returns true, the operation that took place after |
112 | * read_mems_allowed_begin may have failed artificially due to a concurrent | |
113 | * update of mems_allowed. It is up to the caller to retry the operation if | |
cc9a6c87 MG |
114 | * appropriate. |
115 | */ | |
d26914d1 | 116 | static inline bool read_mems_allowed_retry(unsigned int seq) |
c0ff7453 | 117 | { |
d26914d1 | 118 | return read_seqcount_retry(¤t->mems_allowed_seq, seq); |
c0ff7453 MX |
119 | } |
120 | ||
58568d2a MX |
121 | static inline void set_mems_allowed(nodemask_t nodemask) |
122 | { | |
db751fe3 JS |
123 | unsigned long flags; |
124 | ||
c0ff7453 | 125 | task_lock(current); |
db751fe3 | 126 | local_irq_save(flags); |
cc9a6c87 | 127 | write_seqcount_begin(¤t->mems_allowed_seq); |
58568d2a | 128 | current->mems_allowed = nodemask; |
cc9a6c87 | 129 | write_seqcount_end(¤t->mems_allowed_seq); |
db751fe3 | 130 | local_irq_restore(flags); |
c0ff7453 | 131 | task_unlock(current); |
58568d2a MX |
132 | } |
133 | ||
1da177e4 LT |
134 | #else /* !CONFIG_CPUSETS */ |
135 | ||
664eedde MG |
136 | static inline bool cpusets_enabled(void) { return false; } |
137 | ||
1da177e4 LT |
138 | static inline int cpuset_init(void) { return 0; } |
139 | static inline void cpuset_init_smp(void) {} | |
1da177e4 | 140 | |
7ddf96b0 | 141 | static inline void cpuset_update_active_cpus(bool cpu_online) |
3a101d05 TH |
142 | { |
143 | partition_sched_domains(1, NULL, NULL); | |
144 | } | |
145 | ||
6af866af LZ |
146 | static inline void cpuset_cpus_allowed(struct task_struct *p, |
147 | struct cpumask *mask) | |
1da177e4 | 148 | { |
aa85ea5b | 149 | cpumask_copy(mask, cpu_possible_mask); |
1da177e4 LT |
150 | } |
151 | ||
2baab4e9 | 152 | static inline void cpuset_cpus_allowed_fallback(struct task_struct *p) |
9084bb82 | 153 | { |
9084bb82 ON |
154 | } |
155 | ||
909d75a3 PJ |
156 | static inline nodemask_t cpuset_mems_allowed(struct task_struct *p) |
157 | { | |
158 | return node_possible_map; | |
159 | } | |
160 | ||
38d7bee9 | 161 | #define cpuset_current_mems_allowed (node_states[N_MEMORY]) |
1da177e4 | 162 | static inline void cpuset_init_current_mems_allowed(void) {} |
1da177e4 | 163 | |
19770b32 | 164 | static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask) |
1da177e4 LT |
165 | { |
166 | return 1; | |
167 | } | |
168 | ||
344736f2 | 169 | static inline int cpuset_node_allowed(int node, gfp_t gfp_mask) |
02a0e53d PJ |
170 | { |
171 | return 1; | |
172 | } | |
173 | ||
344736f2 | 174 | static inline int cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask) |
1da177e4 LT |
175 | { |
176 | return 1; | |
177 | } | |
178 | ||
bbe373f2 DR |
179 | static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, |
180 | const struct task_struct *tsk2) | |
ef08e3b4 PJ |
181 | { |
182 | return 1; | |
183 | } | |
184 | ||
3e0d98b9 PJ |
185 | static inline void cpuset_memory_pressure_bump(void) {} |
186 | ||
df5f8314 EB |
187 | static inline void cpuset_task_status_allowed(struct seq_file *m, |
188 | struct task_struct *task) | |
1da177e4 | 189 | { |
1da177e4 LT |
190 | } |
191 | ||
825a46af PJ |
192 | static inline int cpuset_mem_spread_node(void) |
193 | { | |
194 | return 0; | |
195 | } | |
196 | ||
6adef3eb JS |
197 | static inline int cpuset_slab_spread_node(void) |
198 | { | |
199 | return 0; | |
200 | } | |
201 | ||
825a46af PJ |
202 | static inline int cpuset_do_page_mem_spread(void) |
203 | { | |
204 | return 0; | |
205 | } | |
206 | ||
207 | static inline int cpuset_do_slab_mem_spread(void) | |
208 | { | |
209 | return 0; | |
210 | } | |
211 | ||
8793d854 PM |
212 | static inline int current_cpuset_is_being_rebound(void) |
213 | { | |
214 | return 0; | |
215 | } | |
216 | ||
e761b772 MK |
217 | static inline void rebuild_sched_domains(void) |
218 | { | |
dfb512ec | 219 | partition_sched_domains(1, NULL, NULL); |
e761b772 MK |
220 | } |
221 | ||
75aa1994 DR |
222 | static inline void cpuset_print_task_mems_allowed(struct task_struct *p) |
223 | { | |
224 | } | |
225 | ||
58568d2a MX |
226 | static inline void set_mems_allowed(nodemask_t nodemask) |
227 | { | |
228 | } | |
229 | ||
d26914d1 | 230 | static inline unsigned int read_mems_allowed_begin(void) |
c0ff7453 | 231 | { |
cc9a6c87 | 232 | return 0; |
c0ff7453 MX |
233 | } |
234 | ||
d26914d1 | 235 | static inline bool read_mems_allowed_retry(unsigned int seq) |
c0ff7453 | 236 | { |
d26914d1 | 237 | return false; |
c0ff7453 MX |
238 | } |
239 | ||
1da177e4 LT |
240 | #endif /* !CONFIG_CPUSETS */ |
241 | ||
242 | #endif /* _LINUX_CPUSET_H */ |