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