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
  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  * reading current mems_allowed and mempolicy in the fastpath must protected
  91  * by get_mems_allowed()
  92  */
  93 static inline void get_mems_allowed(void)
  94 {
  95         current->mems_allowed_change_disable++;
  96
  97         /*
  98          * ensure that reading mems_allowed and mempolicy happens after the
  99          * update of ->mems_allowed_change_disable.
 100          *
 101          * the write-side task finds ->mems_allowed_change_disable is not 0,
 102          * and knows the read-side task is reading mems_allowed or mempolicy,
 103          * so it will clear old bits lazily.
 104          */
 105         smp_mb();
 106 }
 107
 108 static inline void put_mems_allowed(void)
 109 {
 110         /*
 111          * ensure that reading mems_allowed and mempolicy before reducing
 112          * mems_allowed_change_disable.
 113          *
 114          * the write-side task will know that the read-side task is still
 115          * reading mems_allowed or mempolicy, don't clears old bits in the
 116          * nodemask.
 117          */
 118         smp_mb();
 119         --ACCESS_ONCE(current->mems_allowed_change_disable);
 120 }
 121
 122 static inline void set_mems_allowed(nodemask_t nodemask)
 123 {
 124         task_lock(current);
 125         current->mems_allowed = nodemask;
 126         task_unlock(current);
 127 }
 128
 129 #else /* !CONFIG_CPUSETS */
 130
 131 static inline int cpuset_init(void) { return 0; }
 132 static inline void cpuset_init_smp(void) {}
 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 int cpuset_cpus_allowed_fallback(struct task_struct *p)
 141 {
 142         cpumask_copy(&p->cpus_allowed, cpu_possible_mask);
 143         return cpumask_any(cpu_active_mask);
 144 }
 145
 146 static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
 147 {
 148         return node_possible_map;
 149 }
 150
 151 #define cpuset_current_mems_allowed (node_states[N_HIGH_MEMORY])
 152 static inline void cpuset_init_current_mems_allowed(void) {}
 153
 154 static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
 155 {
 156         return 1;
 157 }
 158
 159 static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
 160 {
 161         return 1;
 162 }
 163
 164 static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
 165 {
 166         return 1;
 167 }
 168
 169 static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
 170 {
 171         return 1;
 172 }
 173
 174 static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
 175 {
 176         return 1;
 177 }
 178
 179 static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
 180                                                  const struct task_struct *tsk2)
 181 {
 182         return 1;
 183 }
 184
 185 static inline void cpuset_memory_pressure_bump(void) {}
 186
 187 static inline void cpuset_task_status_allowed(struct seq_file *m,
 188                                                 struct task_struct *task)
 189 {
 190 }
 191
 192 static inline int cpuset_mem_spread_node(void)
 193 {
 194         return 0;
 195 }
 196
 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
 207 static inline int current_cpuset_is_being_rebound(void)
 208 {
 209         return 0;
 210 }
 211
 212 static inline void rebuild_sched_domains(void)
 213 {
 214         partition_sched_domains(1, NULL, NULL);
 215 }
 216
 217 static inline void cpuset_print_task_mems_allowed(struct task_struct *p)
 218 {
 219 }
 220
 221 static inline void set_mems_allowed(nodemask_t nodemask)
 222 {
 223 }
 224
 225 static inline void get_mems_allowed(void)
 226 {
 227 }
 228
 229 static inline void put_mems_allowed(void)
 230 {
 231 }
 232
 233 #endif /* !CONFIG_CPUSETS */
 234
 235 #endif /* _LINUX_CPUSET_H */