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
  16 #ifdef CONFIG_CPUSETS
  17
  18 extern int number_of_cpusets;   /* How many cpusets are defined in system? */
  19
  20 extern int cpuset_init_early(void);
  21 extern int cpuset_init(void);
  22 extern void cpuset_init_smp(void);
  23 extern void cpuset_cpus_allowed(struct task_struct *p, cpumask_t *mask);
  24 extern void cpuset_cpus_allowed_locked(struct task_struct *p, cpumask_t *mask);
  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 void cpuset_update_task_memory_state(void);
  29 int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask);
  30
  31 extern int __cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask);
  32 extern int __cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask);
  33
  34 static int inline cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
  35 {
  36         return number_of_cpusets <= 1 ||
  37                 __cpuset_zone_allowed_softwall(z, gfp_mask);
  38 }
  39
  40 static int inline cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
  41 {
  42         return number_of_cpusets <= 1 ||
  43                 __cpuset_zone_allowed_hardwall(z, gfp_mask);
  44 }
  45
  46 extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
  47                                           const struct task_struct *tsk2);
  48
  49 #define cpuset_memory_pressure_bump()                           \
  50         do {                                                    \
  51                 if (cpuset_memory_pressure_enabled)             \
  52                         __cpuset_memory_pressure_bump();        \
  53         } while (0)
  54 extern int cpuset_memory_pressure_enabled;
  55 extern void __cpuset_memory_pressure_bump(void);
  56
  57 extern const struct file_operations proc_cpuset_operations;
  58 struct seq_file;
  59 extern void cpuset_task_status_allowed(struct seq_file *m,
  60                                         struct task_struct *task);
  61
  62 extern void cpuset_lock(void);
  63 extern void cpuset_unlock(void);
  64
  65 extern int cpuset_mem_spread_node(void);
  66
  67 static inline int cpuset_do_page_mem_spread(void)
  68 {
  69         return current->flags & PF_SPREAD_PAGE;
  70 }
  71
  72 static inline int cpuset_do_slab_mem_spread(void)
  73 {
  74         return current->flags & PF_SPREAD_SLAB;
  75 }
  76
  77 extern void cpuset_track_online_nodes(void);
  78
  79 extern int current_cpuset_is_being_rebound(void);
  80
  81 #else /* !CONFIG_CPUSETS */
  82
  83 static inline int cpuset_init_early(void) { return 0; }
  84 static inline int cpuset_init(void) { return 0; }
  85 static inline void cpuset_init_smp(void) {}
  86
  87 static inline void cpuset_cpus_allowed(struct task_struct *p, cpumask_t *mask)
  88 {
  89         *mask = cpu_possible_map;
  90 }
  91 static inline void cpuset_cpus_allowed_locked(struct task_struct *p,
  92                                                                 cpumask_t *mask)
  93 {
  94         *mask = cpu_possible_map;
  95 }
  96
  97 static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
  98 {
  99         return node_possible_map;
 100 }
 101
 102 #define cpuset_current_mems_allowed (node_states[N_HIGH_MEMORY])
 103 static inline void cpuset_init_current_mems_allowed(void) {}
 104 static inline void cpuset_update_task_memory_state(void) {}
 105
 106 static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
 107 {
 108         return 1;
 109 }
 110
 111 static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
 112 {
 113         return 1;
 114 }
 115
 116 static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
 117 {
 118         return 1;
 119 }
 120
 121 static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
 122                                                  const struct task_struct *tsk2)
 123 {
 124         return 1;
 125 }
 126
 127 static inline void cpuset_memory_pressure_bump(void) {}
 128
 129 static inline void cpuset_task_status_allowed(struct seq_file *m,
 130                                                 struct task_struct *task)
 131 {
 132 }
 133
 134 static inline void cpuset_lock(void) {}
 135 static inline void cpuset_unlock(void) {}
 136
 137 static inline int cpuset_mem_spread_node(void)
 138 {
 139         return 0;
 140 }
 141
 142 static inline int cpuset_do_page_mem_spread(void)
 143 {
 144         return 0;
 145 }
 146
 147 static inline int cpuset_do_slab_mem_spread(void)
 148 {
 149         return 0;
 150 }
 151
 152 static inline void cpuset_track_online_nodes(void) {}
 153
 154 static inline int current_cpuset_is_being_rebound(void)
 155 {
 156         return 0;
 157 }
 158
 159 #endif /* !CONFIG_CPUSETS */
 160
 161 #endif /* _LINUX_CPUSET_H */