include/linux/cpuset.h

   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/cgroup.h>
  15 #include <linux/mm.h>
  16
  17 #ifdef CONFIG_CPUSETS
  18
  19 extern int number_of_cpusets;   /* How many cpusets are defined in system? */
  20
  21 extern int cpuset_init(void);
  22 extern void cpuset_init_smp(void);
  23 extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
  24 extern int 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 const struct file_operations proc_cpuset_operations;
  67 struct seq_file;
  68 extern void cpuset_task_status_allowed(struct seq_file *m,
  69                                         struct task_struct *task);
  70
  71 extern int cpuset_mem_spread_node(void);
  72 extern int cpuset_slab_spread_node(void);
  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
  84 extern int current_cpuset_is_being_rebound(void);
  85
  86 extern void rebuild_sched_domains(void);
  87
  88 extern void cpuset_print_task_mems_allowed(struct task_struct *p);
  89
  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
 123 static inline void set_mems_allowed(nodemask_t nodemask)
 124 {
 125         task_lock(current);
 126         current->mems_allowed = nodemask;
 127         task_unlock(current);
 128 }
 129
 130 #else /* !CONFIG_CPUSETS */
 131
 132 static inline int cpuset_init(void) { return 0; }
 133 static inline void cpuset_init_smp(void) {}
 134
 135 static inline void cpuset_cpus_allowed(struct task_struct *p,
 136                                        struct cpumask *mask)
 137 {
 138         cpumask_copy(mask, cpu_possible_mask);
 139 }
 140
 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
 147 static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
 148 {
 149         return node_possible_map;
 150 }
 151
 152 #define cpuset_current_mems_allowed (node_states[N_HIGH_MEMORY])
 153 static inline void cpuset_init_current_mems_allowed(void) {}
 154
 155 static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
 156 {
 157         return 1;
 158 }
 159
 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
 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)
 176 {
 177         return 1;
 178 }
 179
 180 static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
 181                                                  const struct task_struct *tsk2)
 182 {
 183         return 1;
 184 }
 185
 186 static inline void cpuset_memory_pressure_bump(void) {}
 187
 188 static inline void cpuset_task_status_allowed(struct seq_file *m,
 189                                                 struct task_struct *task)
 190 {
 191 }
 192
 193 static inline int cpuset_mem_spread_node(void)
 194 {
 195         return 0;
 196 }
 197
 198 static inline int cpuset_slab_spread_node(void)
 199 {
 200         return 0;
 201 }
 202
 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
 213 static inline int current_cpuset_is_being_rebound(void)
 214 {
 215         return 0;
 216 }
 217
 218 static inline void rebuild_sched_domains(void)
 219 {
 220         partition_sched_domains(1, NULL, NULL);
 221 }
 222
 223 static inline void cpuset_print_task_mems_allowed(struct task_struct *p)
 224 {
 225 }
 226
 227 static inline void set_mems_allowed(nodemask_t nodemask)
 228 {
 229 }
 230
 231 static inline void get_mems_allowed(void)
 232 {
 233 }
 234
 235 static inline void put_mems_allowed(void)
 236 {
 237 }
 238
 239 #endif /* !CONFIG_CPUSETS */
 240
 241 #endif /* _LINUX_CPUSET_H */