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_update_active_cpus(void);
  24 extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
  25 extern int cpuset_cpus_allowed_fallback(struct task_struct *p);
  26 extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
  27 #define cpuset_current_mems_allowed (current->mems_allowed)
  28 void cpuset_init_current_mems_allowed(void);
  29 int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask);
  30
  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);
  33
  34 static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
  35 {
  36         return number_of_cpusets <= 1 ||
  37                 __cpuset_node_allowed_softwall(node, gfp_mask);
  38 }
  39
  40 static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
  41 {
  42         return number_of_cpusets <= 1 ||
  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);
  54 }
  55
  56 extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
  57                                           const struct task_struct *tsk2);
  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
  67 extern const struct file_operations proc_cpuset_operations;
  68 struct seq_file;
  69 extern void cpuset_task_status_allowed(struct seq_file *m,
  70                                         struct task_struct *task);
  71
  72 extern int cpuset_mem_spread_node(void);
  73 extern int cpuset_slab_spread_node(void);
  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
  85 extern int current_cpuset_is_being_rebound(void);
  86
  87 extern void rebuild_sched_domains(void);
  88
  89 extern void cpuset_print_task_mems_allowed(struct task_struct *p);
  90
  91 /*
  92  * reading current mems_allowed and mempolicy in the fastpath must protected
  93  * by get_mems_allowed()
  94  */
  95 static inline void get_mems_allowed(void)
  96 {
  97         current->mems_allowed_change_disable++;
  98
  99         /*
 100          * ensure that reading mems_allowed and mempolicy happens after the
 101          * update of ->mems_allowed_change_disable.
 102          *
 103          * the write-side task finds ->mems_allowed_change_disable is not 0,
 104          * and knows the read-side task is reading mems_allowed or mempolicy,
 105          * so it will clear old bits lazily.
 106          */
 107         smp_mb();
 108 }
 109
 110 static inline void put_mems_allowed(void)
 111 {
 112         /*
 113          * ensure that reading mems_allowed and mempolicy before reducing
 114          * mems_allowed_change_disable.
 115          *
 116          * the write-side task will know that the read-side task is still
 117          * reading mems_allowed or mempolicy, don't clears old bits in the
 118          * nodemask.
 119          */
 120         smp_mb();
 121         --ACCESS_ONCE(current->mems_allowed_change_disable);
 122 }
 123
 124 static inline void set_mems_allowed(nodemask_t nodemask)
 125 {
 126         task_lock(current);
 127         current->mems_allowed = nodemask;
 128         task_unlock(current);
 129 }
 130
 131 #else /* !CONFIG_CPUSETS */
 132
 133 static inline int cpuset_init(void) { return 0; }
 134 static inline void cpuset_init_smp(void) {}
 135
 136 static inline void cpuset_update_active_cpus(void)
 137 {
 138         partition_sched_domains(1, NULL, NULL);
 139 }
 140
 141 static inline void cpuset_cpus_allowed(struct task_struct *p,
 142                                        struct cpumask *mask)
 143 {
 144         cpumask_copy(mask, cpu_possible_mask);
 145 }
 146
 147 static inline int cpuset_cpus_allowed_fallback(struct task_struct *p)
 148 {
 149         do_set_cpus_allowed(p, cpu_possible_mask);
 150         return cpumask_any(cpu_active_mask);
 151 }
 152
 153 static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
 154 {
 155         return node_possible_map;
 156 }
 157
 158 #define cpuset_current_mems_allowed (node_states[N_HIGH_MEMORY])
 159 static inline void cpuset_init_current_mems_allowed(void) {}
 160
 161 static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
 162 {
 163         return 1;
 164 }
 165
 166 static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
 167 {
 168         return 1;
 169 }
 170
 171 static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
 172 {
 173         return 1;
 174 }
 175
 176 static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
 177 {
 178         return 1;
 179 }
 180
 181 static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
 182 {
 183         return 1;
 184 }
 185
 186 static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
 187                                                  const struct task_struct *tsk2)
 188 {
 189         return 1;
 190 }
 191
 192 static inline void cpuset_memory_pressure_bump(void) {}
 193
 194 static inline void cpuset_task_status_allowed(struct seq_file *m,
 195                                                 struct task_struct *task)
 196 {
 197 }
 198
 199 static inline int cpuset_mem_spread_node(void)
 200 {
 201         return 0;
 202 }
 203
 204 static inline int cpuset_slab_spread_node(void)
 205 {
 206         return 0;
 207 }
 208
 209 static inline int cpuset_do_page_mem_spread(void)
 210 {
 211         return 0;
 212 }
 213
 214 static inline int cpuset_do_slab_mem_spread(void)
 215 {
 216         return 0;
 217 }
 218
 219 static inline int current_cpuset_is_being_rebound(void)
 220 {
 221         return 0;
 222 }
 223
 224 static inline void rebuild_sched_domains(void)
 225 {
 226         partition_sched_domains(1, NULL, NULL);
 227 }
 228
 229 static inline void cpuset_print_task_mems_allowed(struct task_struct *p)
 230 {
 231 }
 232
 233 static inline void set_mems_allowed(nodemask_t nodemask)
 234 {
 235 }
 236
 237 static inline void get_mems_allowed(void)
 238 {
 239 }
 240
 241 static inline void put_mems_allowed(void)
 242 {
 243 }
 244
 245 #endif /* !CONFIG_CPUSETS */
 246
 247 #endif /* _LINUX_CPUSET_H */