| 1 | #ifndef _LINUX_CPUSET_H |
| 2 | #define _LINUX_CPUSET_H |
| 3 | /* |
| 4 | * cpuset interface |
| 5 | * |
| 6 | * Copyright (C) 2003 BULL SA |
| 7 | * Copyright (C) 2004-2006 Silicon Graphics, Inc. |
| 8 | * |
| 9 | */ |
| 10 | |
| 11 | #include <linux/sched.h> |
| 12 | #include <linux/cpumask.h> |
| 13 | #include <linux/nodemask.h> |
| 14 | #include <linux/mm.h> |
| 15 | |
| 16 | #ifdef CONFIG_CPUSETS |
| 17 | |
| 18 | extern int number_of_cpusets; /* How many cpusets are defined in system? */ |
| 19 | |
| 20 | extern int cpuset_init(void); |
| 21 | extern void cpuset_init_smp(void); |
| 22 | extern void cpuset_update_active_cpus(bool cpu_online); |
| 23 | extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask); |
| 24 | extern void cpuset_cpus_allowed_fallback(struct task_struct *p); |
| 25 | extern nodemask_t cpuset_mems_allowed(struct task_struct *p); |
| 26 | #define cpuset_current_mems_allowed (current->mems_allowed) |
| 27 | void cpuset_init_current_mems_allowed(void); |
| 28 | int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask); |
| 29 | |
| 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); |
| 32 | |
| 33 | static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask) |
| 34 | { |
| 35 | return number_of_cpusets <= 1 || |
| 36 | __cpuset_node_allowed_softwall(node, gfp_mask); |
| 37 | } |
| 38 | |
| 39 | static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask) |
| 40 | { |
| 41 | return number_of_cpusets <= 1 || |
| 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); |
| 53 | } |
| 54 | |
| 55 | extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, |
| 56 | const struct task_struct *tsk2); |
| 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 | |
| 66 | extern void cpuset_task_status_allowed(struct seq_file *m, |
| 67 | struct task_struct *task); |
| 68 | extern int proc_cpuset_show(struct seq_file *, void *); |
| 69 | |
| 70 | extern int cpuset_mem_spread_node(void); |
| 71 | extern int cpuset_slab_spread_node(void); |
| 72 | |
| 73 | static inline int cpuset_do_page_mem_spread(void) |
| 74 | { |
| 75 | return current->flags & PF_SPREAD_PAGE; |
| 76 | } |
| 77 | |
| 78 | static inline int cpuset_do_slab_mem_spread(void) |
| 79 | { |
| 80 | return current->flags & PF_SPREAD_SLAB; |
| 81 | } |
| 82 | |
| 83 | extern int current_cpuset_is_being_rebound(void); |
| 84 | |
| 85 | extern void rebuild_sched_domains(void); |
| 86 | |
| 87 | extern void cpuset_print_task_mems_allowed(struct task_struct *p); |
| 88 | |
| 89 | /* |
| 90 | * get_mems_allowed is required when making decisions involving mems_allowed |
| 91 | * such as during page allocation. mems_allowed can be updated in parallel |
| 92 | * and depending on the new value an operation can fail potentially causing |
| 93 | * process failure. A retry loop with get_mems_allowed and put_mems_allowed |
| 94 | * prevents these artificial failures. |
| 95 | */ |
| 96 | static inline unsigned int get_mems_allowed(void) |
| 97 | { |
| 98 | return read_seqcount_begin(¤t->mems_allowed_seq); |
| 99 | } |
| 100 | |
| 101 | /* |
| 102 | * If this returns false, the operation that took place after get_mems_allowed |
| 103 | * may have failed. It is up to the caller to retry the operation if |
| 104 | * appropriate. |
| 105 | */ |
| 106 | static inline bool put_mems_allowed(unsigned int seq) |
| 107 | { |
| 108 | return !read_seqcount_retry(¤t->mems_allowed_seq, seq); |
| 109 | } |
| 110 | |
| 111 | static inline void set_mems_allowed(nodemask_t nodemask) |
| 112 | { |
| 113 | unsigned long flags; |
| 114 | |
| 115 | task_lock(current); |
| 116 | local_irq_save(flags); |
| 117 | write_seqcount_begin(¤t->mems_allowed_seq); |
| 118 | current->mems_allowed = nodemask; |
| 119 | write_seqcount_end(¤t->mems_allowed_seq); |
| 120 | local_irq_restore(flags); |
| 121 | task_unlock(current); |
| 122 | } |
| 123 | |
| 124 | #else /* !CONFIG_CPUSETS */ |
| 125 | |
| 126 | static inline int cpuset_init(void) { return 0; } |
| 127 | static inline void cpuset_init_smp(void) {} |
| 128 | |
| 129 | static inline void cpuset_update_active_cpus(bool cpu_online) |
| 130 | { |
| 131 | partition_sched_domains(1, NULL, NULL); |
| 132 | } |
| 133 | |
| 134 | static inline void cpuset_cpus_allowed(struct task_struct *p, |
| 135 | struct cpumask *mask) |
| 136 | { |
| 137 | cpumask_copy(mask, cpu_possible_mask); |
| 138 | } |
| 139 | |
| 140 | static inline void cpuset_cpus_allowed_fallback(struct task_struct *p) |
| 141 | { |
| 142 | } |
| 143 | |
| 144 | static inline nodemask_t cpuset_mems_allowed(struct task_struct *p) |
| 145 | { |
| 146 | return node_possible_map; |
| 147 | } |
| 148 | |
| 149 | #define cpuset_current_mems_allowed (node_states[N_MEMORY]) |
| 150 | static inline void cpuset_init_current_mems_allowed(void) {} |
| 151 | |
| 152 | static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask) |
| 153 | { |
| 154 | return 1; |
| 155 | } |
| 156 | |
| 157 | static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask) |
| 158 | { |
| 159 | return 1; |
| 160 | } |
| 161 | |
| 162 | static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask) |
| 163 | { |
| 164 | return 1; |
| 165 | } |
| 166 | |
| 167 | static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask) |
| 168 | { |
| 169 | return 1; |
| 170 | } |
| 171 | |
| 172 | static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask) |
| 173 | { |
| 174 | return 1; |
| 175 | } |
| 176 | |
| 177 | static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1, |
| 178 | const struct task_struct *tsk2) |
| 179 | { |
| 180 | return 1; |
| 181 | } |
| 182 | |
| 183 | static inline void cpuset_memory_pressure_bump(void) {} |
| 184 | |
| 185 | static inline void cpuset_task_status_allowed(struct seq_file *m, |
| 186 | struct task_struct *task) |
| 187 | { |
| 188 | } |
| 189 | |
| 190 | static inline int cpuset_mem_spread_node(void) |
| 191 | { |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | static inline int cpuset_slab_spread_node(void) |
| 196 | { |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | static inline int cpuset_do_page_mem_spread(void) |
| 201 | { |
| 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | static inline int cpuset_do_slab_mem_spread(void) |
| 206 | { |
| 207 | return 0; |
| 208 | } |
| 209 | |
| 210 | static inline int current_cpuset_is_being_rebound(void) |
| 211 | { |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | static inline void rebuild_sched_domains(void) |
| 216 | { |
| 217 | partition_sched_domains(1, NULL, NULL); |
| 218 | } |
| 219 | |
| 220 | static inline void cpuset_print_task_mems_allowed(struct task_struct *p) |
| 221 | { |
| 222 | } |
| 223 | |
| 224 | static inline void set_mems_allowed(nodemask_t nodemask) |
| 225 | { |
| 226 | } |
| 227 | |
| 228 | static inline unsigned int get_mems_allowed(void) |
| 229 | { |
| 230 | return 0; |
| 231 | } |
| 232 | |
| 233 | static inline bool put_mems_allowed(unsigned int seq) |
| 234 | { |
| 235 | return true; |
| 236 | } |
| 237 | |
| 238 | #endif /* !CONFIG_CPUSETS */ |
| 239 | |
| 240 | #endif /* _LINUX_CPUSET_H */ |