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_mems_allowed_intersects(const struct task_struct *tsk1,
  49                                           const struct task_struct *tsk2);
  50
  51 #define cpuset_memory_pressure_bump()                           \
  52         do {                                                    \
  53                 if (cpuset_memory_pressure_enabled)             \
  54                         __cpuset_memory_pressure_bump();        \
  55         } while (0)
  56 extern int cpuset_memory_pressure_enabled;
  57 extern void __cpuset_memory_pressure_bump(void);
  58
  59 extern const struct file_operations proc_cpuset_operations;
  60 extern char *cpuset_task_status_allowed(struct task_struct *task, char *buffer);
  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 #else /* !CONFIG_CPUSETS */
  80
  81 static inline int cpuset_init_early(void) { return 0; }
  82 static inline int cpuset_init(void) { return 0; }
  83 static inline void cpuset_init_smp(void) {}
  84 static inline void cpuset_fork(struct task_struct *p) {}
  85 static inline void cpuset_exit(struct task_struct *p) {}
  86
  87 static inline cpumask_t cpuset_cpus_allowed(struct task_struct *p)
  88 {
  89         return cpu_possible_map;
  90 }
  91
  92 static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
  93 {
  94         return node_possible_map;
  95 }
  96
  97 #define cpuset_current_mems_allowed (node_states[N_HIGH_MEMORY])
  98 static inline void cpuset_init_current_mems_allowed(void) {}
  99 static inline void cpuset_update_task_memory_state(void) {}
 100 #define cpuset_nodes_subset_current_mems_allowed(nodes) (1)
 101
 102 static inline int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl)
 103 {
 104         return 1;
 105 }
 106
 107 static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
 108 {
 109         return 1;
 110 }
 111
 112 static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
 113 {
 114         return 1;
 115 }
 116
 117 static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
 118                                                  const struct task_struct *tsk2)
 119 {
 120         return 1;
 121 }
 122
 123 static inline void cpuset_memory_pressure_bump(void) {}
 124
 125 static inline char *cpuset_task_status_allowed(struct task_struct *task,
 126                                                         char *buffer)
 127 {
 128         return buffer;
 129 }
 130
 131 static inline void cpuset_lock(void) {}
 132 static inline void cpuset_unlock(void) {}
 133
 134 static inline int cpuset_mem_spread_node(void)
 135 {
 136         return 0;
 137 }
 138
 139 static inline int cpuset_do_page_mem_spread(void)
 140 {
 141         return 0;
 142 }
 143
 144 static inline int cpuset_do_slab_mem_spread(void)
 145 {
 146         return 0;
 147 }
 148
 149 static inline void cpuset_track_online_nodes(void) {}
 150
 151 #endif /* !CONFIG_CPUSETS */
 152
 153 #endif /* _LINUX_CPUSET_H */