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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> | |
8793d854 | 14 | #include <linux/cgroup.h> |
a1bc5a4e | 15 | #include <linux/mm.h> |
1da177e4 LT |
16 | |
17 | #ifdef CONFIG_CPUSETS | |
18 | ||
202f72d5 PJ |
19 | extern int number_of_cpusets; /* How many cpusets are defined in system? */ |
20 | ||
1da177e4 LT |
21 | extern int cpuset_init(void); |
22 | extern void cpuset_init_smp(void); | |
6af866af | 23 | extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask); |
9084bb82 | 24 | extern int cpuset_cpus_allowed_fallback(struct task_struct *p); |
909d75a3 | 25 | extern nodemask_t cpuset_mems_allowed(struct task_struct *p); |
9276b1bc | 26 | #define cpuset_current_mems_allowed (current->mems_allowed) |
1da177e4 | 27 | void cpuset_init_current_mems_allowed(void); |
19770b32 | 28 | int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask); |
202f72d5 | 29 | |
a1bc5a4e DR |
30 | extern int __cpuset_node_allowed_softwall(int node, gfp_t gfp_mask); |
31 | extern int __cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask); | |
02a0e53d | 32 | |
a1bc5a4e | 33 | static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask) |
02a0e53d PJ |
34 | { |
35 | return number_of_cpusets <= 1 || | |
a1bc5a4e | 36 | __cpuset_node_allowed_softwall(node, gfp_mask); |
02a0e53d PJ |
37 | } |
38 | ||
a1bc5a4e | 39 | static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask) |
202f72d5 | 40 | { |
02a0e53d | 41 | return number_of_cpusets <= 1 || |
a1bc5a4e DR |
42 | __cpuset_node_allowed_hardwall(node, gfp_mask); |
43 | } | |
44 | ||
45 | static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask) | |
46 | { | |
47 | return cpuset_node_allowed_softwall(zone_to_nid(z), gfp_mask); | |
48 | } | |
49 | ||
50 | static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask) | |
51 | { | |
52 | return cpuset_node_allowed_hardwall(zone_to_nid(z), gfp_mask); | |
202f72d5 PJ |
53 | } |
54 | ||
bbe373f2 DR |
55 | extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, |
56 | const struct task_struct *tsk2); | |
3e0d98b9 PJ |
57 | |
58 | #define cpuset_memory_pressure_bump() \ | |
59 | do { \ | |
60 | if (cpuset_memory_pressure_enabled) \ | |
61 | __cpuset_memory_pressure_bump(); \ | |
62 | } while (0) | |
63 | extern int cpuset_memory_pressure_enabled; | |
64 | extern void __cpuset_memory_pressure_bump(void); | |
65 | ||
54047320 | 66 | extern const struct file_operations proc_cpuset_operations; |
df5f8314 EB |
67 | struct seq_file; |
68 | extern void cpuset_task_status_allowed(struct seq_file *m, | |
69 | struct task_struct *task); | |
1da177e4 | 70 | |
825a46af | 71 | extern int cpuset_mem_spread_node(void); |
6adef3eb | 72 | extern int cpuset_slab_spread_node(void); |
825a46af PJ |
73 | |
74 | static inline int cpuset_do_page_mem_spread(void) | |
75 | { | |
76 | return current->flags & PF_SPREAD_PAGE; | |
77 | } | |
78 | ||
79 | static inline int cpuset_do_slab_mem_spread(void) | |
80 | { | |
81 | return current->flags & PF_SPREAD_SLAB; | |
82 | } | |
83 | ||
8793d854 PM |
84 | extern int current_cpuset_is_being_rebound(void); |
85 | ||
e761b772 MK |
86 | extern void rebuild_sched_domains(void); |
87 | ||
75aa1994 DR |
88 | extern void cpuset_print_task_mems_allowed(struct task_struct *p); |
89 | ||
c0ff7453 MX |
90 | /* |
91 | * reading current mems_allowed and mempolicy in the fastpath must protected | |
92 | * by get_mems_allowed() | |
93 | */ | |
94 | static inline void get_mems_allowed(void) | |
95 | { | |
96 | current->mems_allowed_change_disable++; | |
97 | ||
98 | /* | |
99 | * ensure that reading mems_allowed and mempolicy happens after the | |
100 | * update of ->mems_allowed_change_disable. | |
101 | * | |
102 | * the write-side task finds ->mems_allowed_change_disable is not 0, | |
103 | * and knows the read-side task is reading mems_allowed or mempolicy, | |
104 | * so it will clear old bits lazily. | |
105 | */ | |
106 | smp_mb(); | |
107 | } | |
108 | ||
109 | static inline void put_mems_allowed(void) | |
110 | { | |
111 | /* | |
112 | * ensure that reading mems_allowed and mempolicy before reducing | |
113 | * mems_allowed_change_disable. | |
114 | * | |
115 | * the write-side task will know that the read-side task is still | |
116 | * reading mems_allowed or mempolicy, don't clears old bits in the | |
117 | * nodemask. | |
118 | */ | |
119 | smp_mb(); | |
120 | --ACCESS_ONCE(current->mems_allowed_change_disable); | |
121 | } | |
122 | ||
58568d2a MX |
123 | static inline void set_mems_allowed(nodemask_t nodemask) |
124 | { | |
c0ff7453 | 125 | task_lock(current); |
58568d2a | 126 | current->mems_allowed = nodemask; |
c0ff7453 | 127 | task_unlock(current); |
58568d2a MX |
128 | } |
129 | ||
1da177e4 LT |
130 | #else /* !CONFIG_CPUSETS */ |
131 | ||
132 | static inline int cpuset_init(void) { return 0; } | |
133 | static inline void cpuset_init_smp(void) {} | |
1da177e4 | 134 | |
6af866af LZ |
135 | static inline void cpuset_cpus_allowed(struct task_struct *p, |
136 | struct cpumask *mask) | |
1da177e4 | 137 | { |
aa85ea5b | 138 | cpumask_copy(mask, cpu_possible_mask); |
1da177e4 LT |
139 | } |
140 | ||
9084bb82 ON |
141 | static inline int cpuset_cpus_allowed_fallback(struct task_struct *p) |
142 | { | |
143 | cpumask_copy(&p->cpus_allowed, cpu_possible_mask); | |
144 | return cpumask_any(cpu_active_mask); | |
145 | } | |
146 | ||
909d75a3 PJ |
147 | static inline nodemask_t cpuset_mems_allowed(struct task_struct *p) |
148 | { | |
149 | return node_possible_map; | |
150 | } | |
151 | ||
0e1e7c7a | 152 | #define cpuset_current_mems_allowed (node_states[N_HIGH_MEMORY]) |
1da177e4 | 153 | static inline void cpuset_init_current_mems_allowed(void) {} |
1da177e4 | 154 | |
19770b32 | 155 | static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask) |
1da177e4 LT |
156 | { |
157 | return 1; | |
158 | } | |
159 | ||
a1bc5a4e DR |
160 | static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask) |
161 | { | |
162 | return 1; | |
163 | } | |
164 | ||
165 | static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask) | |
166 | { | |
167 | return 1; | |
168 | } | |
169 | ||
02a0e53d PJ |
170 | static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask) |
171 | { | |
172 | return 1; | |
173 | } | |
174 | ||
175 | static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask) | |
1da177e4 LT |
176 | { |
177 | return 1; | |
178 | } | |
179 | ||
bbe373f2 DR |
180 | static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, |
181 | const struct task_struct *tsk2) | |
ef08e3b4 PJ |
182 | { |
183 | return 1; | |
184 | } | |
185 | ||
3e0d98b9 PJ |
186 | static inline void cpuset_memory_pressure_bump(void) {} |
187 | ||
df5f8314 EB |
188 | static inline void cpuset_task_status_allowed(struct seq_file *m, |
189 | struct task_struct *task) | |
1da177e4 | 190 | { |
1da177e4 LT |
191 | } |
192 | ||
825a46af PJ |
193 | static inline int cpuset_mem_spread_node(void) |
194 | { | |
195 | return 0; | |
196 | } | |
197 | ||
6adef3eb JS |
198 | static inline int cpuset_slab_spread_node(void) |
199 | { | |
200 | return 0; | |
201 | } | |
202 | ||
825a46af PJ |
203 | static inline int cpuset_do_page_mem_spread(void) |
204 | { | |
205 | return 0; | |
206 | } | |
207 | ||
208 | static inline int cpuset_do_slab_mem_spread(void) | |
209 | { | |
210 | return 0; | |
211 | } | |
212 | ||
8793d854 PM |
213 | static inline int current_cpuset_is_being_rebound(void) |
214 | { | |
215 | return 0; | |
216 | } | |
217 | ||
e761b772 MK |
218 | static inline void rebuild_sched_domains(void) |
219 | { | |
dfb512ec | 220 | partition_sched_domains(1, NULL, NULL); |
e761b772 MK |
221 | } |
222 | ||
75aa1994 DR |
223 | static inline void cpuset_print_task_mems_allowed(struct task_struct *p) |
224 | { | |
225 | } | |
226 | ||
58568d2a MX |
227 | static inline void set_mems_allowed(nodemask_t nodemask) |
228 | { | |
229 | } | |
230 | ||
c0ff7453 MX |
231 | static inline void get_mems_allowed(void) |
232 | { | |
233 | } | |
234 | ||
235 | static inline void put_mems_allowed(void) | |
236 | { | |
237 | } | |
238 | ||
1da177e4 LT |
239 | #endif /* !CONFIG_CPUSETS */ |
240 | ||
241 | #endif /* _LINUX_CPUSET_H */ |