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/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 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  * get_mems_allowed is required when making decisions involving mems_allowed
  92  * such as during page allocation. mems_allowed can be updated in parallel
  93  * and depending on the new value an operation can fail potentially causing
  94  * process failure. A retry loop with get_mems_allowed and put_mems_allowed
  95  * prevents these artificial failures.
  96  */
  97 static inline unsigned int get_mems_allowed(void)
  98 {
  99         return read_seqcount_begin(&current->mems_allowed_seq);
 100 }
 101
 102 /*
 103  * If this returns false, the operation that took place after get_mems_allowed
 104  * may have failed. It is up to the caller to retry the operation if
 105  * appropriate.
 106  */
 107 static inline bool put_mems_allowed(unsigned int seq)
 108 {
 109         return !read_seqcount_retry(&current->mems_allowed_seq, seq);
 110 }
 111
 112 static inline void set_mems_allowed(nodemask_t nodemask)
 113 {
 114         task_lock(current);
 115         write_seqcount_begin(&current->mems_allowed_seq);
 116         current->mems_allowed = nodemask;
 117         write_seqcount_end(&current->mems_allowed_seq);
 118         task_unlock(current);
 119 }
 120
 121 #else /* !CONFIG_CPUSETS */
 122
 123 static inline int cpuset_init(void) { return 0; }
 124 static inline void cpuset_init_smp(void) {}
 125
 126 static inline void cpuset_update_active_cpus(bool cpu_online)
 127 {
 128         partition_sched_domains(1, NULL, NULL);
 129 }
 130
 131 static inline void cpuset_cpus_allowed(struct task_struct *p,
 132                                        struct cpumask *mask)
 133 {
 134         cpumask_copy(mask, cpu_possible_mask);
 135 }
 136
 137 static inline void cpuset_cpus_allowed_fallback(struct task_struct *p)
 138 {
 139 }
 140
 141 static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
 142 {
 143         return node_possible_map;
 144 }
 145
 146 #define cpuset_current_mems_allowed (node_states[N_MEMORY])
 147 static inline void cpuset_init_current_mems_allowed(void) {}
 148
 149 static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
 150 {
 151         return 1;
 152 }
 153
 154 static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
 155 {
 156         return 1;
 157 }
 158
 159 static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
 160 {
 161         return 1;
 162 }
 163
 164 static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
 165 {
 166         return 1;
 167 }
 168
 169 static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
 170 {
 171         return 1;
 172 }
 173
 174 static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
 175                                                  const struct task_struct *tsk2)
 176 {
 177         return 1;
 178 }
 179
 180 static inline void cpuset_memory_pressure_bump(void) {}
 181
 182 static inline void cpuset_task_status_allowed(struct seq_file *m,
 183                                                 struct task_struct *task)
 184 {
 185 }
 186
 187 static inline int cpuset_mem_spread_node(void)
 188 {
 189         return 0;
 190 }
 191
 192 static inline int cpuset_slab_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 unsigned int get_mems_allowed(void)
 226 {
 227         return 0;
 228 }
 229
 230 static inline bool put_mems_allowed(unsigned int seq)
 231 {
 232         return true;
 233 }
 234
 235 #endif /* !CONFIG_CPUSETS */
 236
 237 #endif /* _LINUX_CPUSET_H */