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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> |
1da177e4 LT |
15 | |
16 | #ifdef CONFIG_CPUSETS | |
17 | ||
202f72d5 PJ |
18 | extern int number_of_cpusets; /* How many cpusets are defined in system? */ |
19 | ||
1da177e4 LT |
20 | extern int cpuset_init(void); |
21 | extern void cpuset_init_smp(void); | |
7ddf96b0 | 22 | extern void cpuset_update_active_cpus(bool cpu_online); |
6af866af | 23 | extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask); |
2baab4e9 | 24 | extern void 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 | 90 | /* |
cc9a6c87 MG |
91 | * get_mems_allowed is required when making decisions involving mems_allowed |
92 | * such as during page allocation. mems_allowed can be updated in parallel | |
93 | * and depending on the new value an operation can fail potentially causing | |
94 | * process failure. A retry loop with get_mems_allowed and put_mems_allowed | |
95 | * prevents these artificial failures. | |
c0ff7453 | 96 | */ |
cc9a6c87 | 97 | static inline unsigned int get_mems_allowed(void) |
c0ff7453 | 98 | { |
cc9a6c87 | 99 | return read_seqcount_begin(¤t->mems_allowed_seq); |
c0ff7453 MX |
100 | } |
101 | ||
cc9a6c87 MG |
102 | /* |
103 | * If this returns false, the operation that took place after get_mems_allowed | |
104 | * may have failed. It is up to the caller to retry the operation if | |
105 | * appropriate. | |
106 | */ | |
107 | static inline bool put_mems_allowed(unsigned int seq) | |
c0ff7453 | 108 | { |
cc9a6c87 | 109 | return !read_seqcount_retry(¤t->mems_allowed_seq, seq); |
c0ff7453 MX |
110 | } |
111 | ||
58568d2a MX |
112 | static inline void set_mems_allowed(nodemask_t nodemask) |
113 | { | |
c0ff7453 | 114 | task_lock(current); |
cc9a6c87 | 115 | write_seqcount_begin(¤t->mems_allowed_seq); |
58568d2a | 116 | current->mems_allowed = nodemask; |
cc9a6c87 | 117 | write_seqcount_end(¤t->mems_allowed_seq); |
c0ff7453 | 118 | task_unlock(current); |
58568d2a MX |
119 | } |
120 | ||
1da177e4 LT |
121 | #else /* !CONFIG_CPUSETS */ |
122 | ||
123 | static inline int cpuset_init(void) { return 0; } | |
124 | static inline void cpuset_init_smp(void) {} | |
1da177e4 | 125 | |
7ddf96b0 | 126 | static inline void cpuset_update_active_cpus(bool cpu_online) |
3a101d05 TH |
127 | { |
128 | partition_sched_domains(1, NULL, NULL); | |
129 | } | |
130 | ||
6af866af LZ |
131 | static inline void cpuset_cpus_allowed(struct task_struct *p, |
132 | struct cpumask *mask) | |
1da177e4 | 133 | { |
aa85ea5b | 134 | cpumask_copy(mask, cpu_possible_mask); |
1da177e4 LT |
135 | } |
136 | ||
2baab4e9 | 137 | static inline void cpuset_cpus_allowed_fallback(struct task_struct *p) |
9084bb82 | 138 | { |
9084bb82 ON |
139 | } |
140 | ||
909d75a3 PJ |
141 | static inline nodemask_t cpuset_mems_allowed(struct task_struct *p) |
142 | { | |
143 | return node_possible_map; | |
144 | } | |
145 | ||
38d7bee9 | 146 | #define cpuset_current_mems_allowed (node_states[N_MEMORY]) |
1da177e4 | 147 | static inline void cpuset_init_current_mems_allowed(void) {} |
1da177e4 | 148 | |
19770b32 | 149 | static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask) |
1da177e4 LT |
150 | { |
151 | return 1; | |
152 | } | |
153 | ||
a1bc5a4e DR |
154 | static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask) |
155 | { | |
156 | return 1; | |
157 | } | |
158 | ||
159 | static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask) | |
160 | { | |
161 | return 1; | |
162 | } | |
163 | ||
02a0e53d PJ |
164 | static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask) |
165 | { | |
166 | return 1; | |
167 | } | |
168 | ||
169 | static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask) | |
1da177e4 LT |
170 | { |
171 | return 1; | |
172 | } | |
173 | ||
bbe373f2 DR |
174 | static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, |
175 | const struct task_struct *tsk2) | |
ef08e3b4 PJ |
176 | { |
177 | return 1; | |
178 | } | |
179 | ||
3e0d98b9 PJ |
180 | static inline void cpuset_memory_pressure_bump(void) {} |
181 | ||
df5f8314 EB |
182 | static inline void cpuset_task_status_allowed(struct seq_file *m, |
183 | struct task_struct *task) | |
1da177e4 | 184 | { |
1da177e4 LT |
185 | } |
186 | ||
825a46af PJ |
187 | static inline int cpuset_mem_spread_node(void) |
188 | { | |
189 | return 0; | |
190 | } | |
191 | ||
6adef3eb JS |
192 | static inline int cpuset_slab_spread_node(void) |
193 | { | |
194 | return 0; | |
195 | } | |
196 | ||
825a46af PJ |
197 | static inline int cpuset_do_page_mem_spread(void) |
198 | { | |
199 | return 0; | |
200 | } | |
201 | ||
202 | static inline int cpuset_do_slab_mem_spread(void) | |
203 | { | |
204 | return 0; | |
205 | } | |
206 | ||
8793d854 PM |
207 | static inline int current_cpuset_is_being_rebound(void) |
208 | { | |
209 | return 0; | |
210 | } | |
211 | ||
e761b772 MK |
212 | static inline void rebuild_sched_domains(void) |
213 | { | |
dfb512ec | 214 | partition_sched_domains(1, NULL, NULL); |
e761b772 MK |
215 | } |
216 | ||
75aa1994 DR |
217 | static inline void cpuset_print_task_mems_allowed(struct task_struct *p) |
218 | { | |
219 | } | |
220 | ||
58568d2a MX |
221 | static inline void set_mems_allowed(nodemask_t nodemask) |
222 | { | |
223 | } | |
224 | ||
cc9a6c87 | 225 | static inline unsigned int get_mems_allowed(void) |
c0ff7453 | 226 | { |
cc9a6c87 | 227 | return 0; |
c0ff7453 MX |
228 | } |
229 | ||
cc9a6c87 | 230 | static inline bool put_mems_allowed(unsigned int seq) |
c0ff7453 | 231 | { |
cc9a6c87 | 232 | return true; |
c0ff7453 MX |
233 | } |
234 | ||
1da177e4 LT |
235 | #endif /* !CONFIG_CPUSETS */ |
236 | ||
237 | #endif /* _LINUX_CPUSET_H */ |