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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); | |
7ddf96b0 | 23 | extern void cpuset_update_active_cpus(bool cpu_online); |
6af866af | 24 | extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask); |
2baab4e9 | 25 | extern void cpuset_cpus_allowed_fallback(struct task_struct *p); |
909d75a3 | 26 | extern nodemask_t cpuset_mems_allowed(struct task_struct *p); |
9276b1bc | 27 | #define cpuset_current_mems_allowed (current->mems_allowed) |
1da177e4 | 28 | void cpuset_init_current_mems_allowed(void); |
19770b32 | 29 | int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask); |
202f72d5 | 30 | |
a1bc5a4e DR |
31 | extern int __cpuset_node_allowed_softwall(int node, gfp_t gfp_mask); |
32 | extern int __cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask); | |
02a0e53d | 33 | |
a1bc5a4e | 34 | static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask) |
02a0e53d PJ |
35 | { |
36 | return number_of_cpusets <= 1 || | |
a1bc5a4e | 37 | __cpuset_node_allowed_softwall(node, gfp_mask); |
02a0e53d PJ |
38 | } |
39 | ||
a1bc5a4e | 40 | static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask) |
202f72d5 | 41 | { |
02a0e53d | 42 | return number_of_cpusets <= 1 || |
a1bc5a4e DR |
43 | __cpuset_node_allowed_hardwall(node, gfp_mask); |
44 | } | |
45 | ||
46 | static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask) | |
47 | { | |
48 | return cpuset_node_allowed_softwall(zone_to_nid(z), gfp_mask); | |
49 | } | |
50 | ||
51 | static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask) | |
52 | { | |
53 | return cpuset_node_allowed_hardwall(zone_to_nid(z), gfp_mask); | |
202f72d5 PJ |
54 | } |
55 | ||
bbe373f2 DR |
56 | extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, |
57 | const struct task_struct *tsk2); | |
3e0d98b9 PJ |
58 | |
59 | #define cpuset_memory_pressure_bump() \ | |
60 | do { \ | |
61 | if (cpuset_memory_pressure_enabled) \ | |
62 | __cpuset_memory_pressure_bump(); \ | |
63 | } while (0) | |
64 | extern int cpuset_memory_pressure_enabled; | |
65 | extern void __cpuset_memory_pressure_bump(void); | |
66 | ||
54047320 | 67 | extern const struct file_operations proc_cpuset_operations; |
df5f8314 EB |
68 | struct seq_file; |
69 | extern void cpuset_task_status_allowed(struct seq_file *m, | |
70 | struct task_struct *task); | |
1da177e4 | 71 | |
825a46af | 72 | extern int cpuset_mem_spread_node(void); |
6adef3eb | 73 | extern int cpuset_slab_spread_node(void); |
825a46af PJ |
74 | |
75 | static inline int cpuset_do_page_mem_spread(void) | |
76 | { | |
77 | return current->flags & PF_SPREAD_PAGE; | |
78 | } | |
79 | ||
80 | static inline int cpuset_do_slab_mem_spread(void) | |
81 | { | |
82 | return current->flags & PF_SPREAD_SLAB; | |
83 | } | |
84 | ||
8793d854 PM |
85 | extern int current_cpuset_is_being_rebound(void); |
86 | ||
e761b772 MK |
87 | extern void rebuild_sched_domains(void); |
88 | ||
75aa1994 DR |
89 | extern void cpuset_print_task_mems_allowed(struct task_struct *p); |
90 | ||
c0ff7453 | 91 | /* |
cc9a6c87 MG |
92 | * get_mems_allowed is required when making decisions involving mems_allowed |
93 | * such as during page allocation. mems_allowed can be updated in parallel | |
94 | * and depending on the new value an operation can fail potentially causing | |
95 | * process failure. A retry loop with get_mems_allowed and put_mems_allowed | |
96 | * prevents these artificial failures. | |
c0ff7453 | 97 | */ |
cc9a6c87 | 98 | static inline unsigned int get_mems_allowed(void) |
c0ff7453 | 99 | { |
cc9a6c87 | 100 | return read_seqcount_begin(¤t->mems_allowed_seq); |
c0ff7453 MX |
101 | } |
102 | ||
cc9a6c87 MG |
103 | /* |
104 | * If this returns false, the operation that took place after get_mems_allowed | |
105 | * may have failed. It is up to the caller to retry the operation if | |
106 | * appropriate. | |
107 | */ | |
108 | static inline bool put_mems_allowed(unsigned int seq) | |
c0ff7453 | 109 | { |
cc9a6c87 | 110 | return !read_seqcount_retry(¤t->mems_allowed_seq, seq); |
c0ff7453 MX |
111 | } |
112 | ||
58568d2a MX |
113 | static inline void set_mems_allowed(nodemask_t nodemask) |
114 | { | |
c0ff7453 | 115 | task_lock(current); |
cc9a6c87 | 116 | write_seqcount_begin(¤t->mems_allowed_seq); |
58568d2a | 117 | current->mems_allowed = nodemask; |
cc9a6c87 | 118 | write_seqcount_end(¤t->mems_allowed_seq); |
c0ff7453 | 119 | task_unlock(current); |
58568d2a MX |
120 | } |
121 | ||
1da177e4 LT |
122 | #else /* !CONFIG_CPUSETS */ |
123 | ||
124 | static inline int cpuset_init(void) { return 0; } | |
125 | static inline void cpuset_init_smp(void) {} | |
1da177e4 | 126 | |
7ddf96b0 | 127 | static inline void cpuset_update_active_cpus(bool cpu_online) |
3a101d05 TH |
128 | { |
129 | partition_sched_domains(1, NULL, NULL); | |
130 | } | |
131 | ||
6af866af LZ |
132 | static inline void cpuset_cpus_allowed(struct task_struct *p, |
133 | struct cpumask *mask) | |
1da177e4 | 134 | { |
aa85ea5b | 135 | cpumask_copy(mask, cpu_possible_mask); |
1da177e4 LT |
136 | } |
137 | ||
2baab4e9 | 138 | static inline void cpuset_cpus_allowed_fallback(struct task_struct *p) |
9084bb82 | 139 | { |
9084bb82 ON |
140 | } |
141 | ||
909d75a3 PJ |
142 | static inline nodemask_t cpuset_mems_allowed(struct task_struct *p) |
143 | { | |
144 | return node_possible_map; | |
145 | } | |
146 | ||
38d7bee9 | 147 | #define cpuset_current_mems_allowed (node_states[N_MEMORY]) |
1da177e4 | 148 | static inline void cpuset_init_current_mems_allowed(void) {} |
1da177e4 | 149 | |
19770b32 | 150 | static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask) |
1da177e4 LT |
151 | { |
152 | return 1; | |
153 | } | |
154 | ||
a1bc5a4e DR |
155 | static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask) |
156 | { | |
157 | return 1; | |
158 | } | |
159 | ||
160 | static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask) | |
161 | { | |
162 | return 1; | |
163 | } | |
164 | ||
02a0e53d PJ |
165 | static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask) |
166 | { | |
167 | return 1; | |
168 | } | |
169 | ||
170 | static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask) | |
1da177e4 LT |
171 | { |
172 | return 1; | |
173 | } | |
174 | ||
bbe373f2 DR |
175 | static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, |
176 | const struct task_struct *tsk2) | |
ef08e3b4 PJ |
177 | { |
178 | return 1; | |
179 | } | |
180 | ||
3e0d98b9 PJ |
181 | static inline void cpuset_memory_pressure_bump(void) {} |
182 | ||
df5f8314 EB |
183 | static inline void cpuset_task_status_allowed(struct seq_file *m, |
184 | struct task_struct *task) | |
1da177e4 | 185 | { |
1da177e4 LT |
186 | } |
187 | ||
825a46af PJ |
188 | static inline int cpuset_mem_spread_node(void) |
189 | { | |
190 | return 0; | |
191 | } | |
192 | ||
6adef3eb JS |
193 | static inline int cpuset_slab_spread_node(void) |
194 | { | |
195 | return 0; | |
196 | } | |
197 | ||
825a46af PJ |
198 | static inline int cpuset_do_page_mem_spread(void) |
199 | { | |
200 | return 0; | |
201 | } | |
202 | ||
203 | static inline int cpuset_do_slab_mem_spread(void) | |
204 | { | |
205 | return 0; | |
206 | } | |
207 | ||
8793d854 PM |
208 | static inline int current_cpuset_is_being_rebound(void) |
209 | { | |
210 | return 0; | |
211 | } | |
212 | ||
e761b772 MK |
213 | static inline void rebuild_sched_domains(void) |
214 | { | |
dfb512ec | 215 | partition_sched_domains(1, NULL, NULL); |
e761b772 MK |
216 | } |
217 | ||
75aa1994 DR |
218 | static inline void cpuset_print_task_mems_allowed(struct task_struct *p) |
219 | { | |
220 | } | |
221 | ||
58568d2a MX |
222 | static inline void set_mems_allowed(nodemask_t nodemask) |
223 | { | |
224 | } | |
225 | ||
cc9a6c87 | 226 | static inline unsigned int get_mems_allowed(void) |
c0ff7453 | 227 | { |
cc9a6c87 | 228 | return 0; |
c0ff7453 MX |
229 | } |
230 | ||
cc9a6c87 | 231 | static inline bool put_mems_allowed(unsigned int seq) |
c0ff7453 | 232 | { |
cc9a6c87 | 233 | return true; |
c0ff7453 MX |
234 | } |
235 | ||
1da177e4 LT |
236 | #endif /* !CONFIG_CPUSETS */ |
237 | ||
238 | #endif /* _LINUX_CPUSET_H */ |