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 void cpuset_init_current_mems_allowed(void);
  27 void cpuset_update_task_memory_state(void);
  28 #define cpuset_nodes_subset_current_mems_allowed(nodes) \
  29                 nodes_subset((nodes), current->mems_allowed)
  30 int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl);
  31
  32 extern int __cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask);
  33 static int inline cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
  34 {
  35         return number_of_cpusets <= 1 || __cpuset_zone_allowed(z, gfp_mask);
  36 }
  37
  38 extern int cpuset_excl_nodes_overlap(const struct task_struct *p);
  39
  40 #define cpuset_memory_pressure_bump()                           \
  41         do {                                                    \
  42                 if (cpuset_memory_pressure_enabled)             \
  43                         __cpuset_memory_pressure_bump();        \
  44         } while (0)
  45 extern int cpuset_memory_pressure_enabled;
  46 extern void __cpuset_memory_pressure_bump(void);
  47
  48 extern struct file_operations proc_cpuset_operations;
  49 extern char *cpuset_task_status_allowed(struct task_struct *task, char *buffer);
  50
  51 extern void cpuset_lock(void);
  52 extern void cpuset_unlock(void);
  53
  54 extern int cpuset_mem_spread_node(void);
  55
  56 static inline int cpuset_do_page_mem_spread(void)
  57 {
  58         return current->flags & PF_SPREAD_PAGE;
  59 }
  60
  61 static inline int cpuset_do_slab_mem_spread(void)
  62 {
  63         return current->flags & PF_SPREAD_SLAB;
  64 }
  65
  66 #else /* !CONFIG_CPUSETS */
  67
  68 static inline int cpuset_init_early(void) { return 0; }
  69 static inline int cpuset_init(void) { return 0; }
  70 static inline void cpuset_init_smp(void) {}
  71 static inline void cpuset_fork(struct task_struct *p) {}
  72 static inline void cpuset_exit(struct task_struct *p) {}
  73
  74 static inline cpumask_t cpuset_cpus_allowed(struct task_struct *p)
  75 {
  76         return cpu_possible_map;
  77 }
  78
  79 static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
  80 {
  81         return node_possible_map;
  82 }
  83
  84 static inline void cpuset_init_current_mems_allowed(void) {}
  85 static inline void cpuset_update_task_memory_state(void) {}
  86 #define cpuset_nodes_subset_current_mems_allowed(nodes) (1)
  87
  88 static inline int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl)
  89 {
  90         return 1;
  91 }
  92
  93 static inline int cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
  94 {
  95         return 1;
  96 }
  97
  98 static inline int cpuset_excl_nodes_overlap(const struct task_struct *p)
  99 {
 100         return 1;
 101 }
 102
 103 static inline void cpuset_memory_pressure_bump(void) {}
 104
 105 static inline char *cpuset_task_status_allowed(struct task_struct *task,
 106                                                         char *buffer)
 107 {
 108         return buffer;
 109 }
 110
 111 static inline void cpuset_lock(void) {}
 112 static inline void cpuset_unlock(void) {}
 113
 114 static inline int cpuset_mem_spread_node(void)
 115 {
 116         return 0;
 117 }
 118
 119 static inline int cpuset_do_page_mem_spread(void)
 120 {
 121         return 0;
 122 }
 123
 124 static inline int cpuset_do_slab_mem_spread(void)
 125 {
 126         return 0;
 127 }
 128
 129 #endif /* !CONFIG_CPUSETS */
 130
 131 #endif /* _LINUX_CPUSET_H */