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 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 #else /* !CONFIG_CPUSETS */
  55
  56 static inline int cpuset_init_early(void) { return 0; }
  57 static inline int cpuset_init(void) { return 0; }
  58 static inline void cpuset_init_smp(void) {}
  59 static inline void cpuset_fork(struct task_struct *p) {}
  60 static inline void cpuset_exit(struct task_struct *p) {}
  61
  62 static inline cpumask_t cpuset_cpus_allowed(struct task_struct *p)
  63 {
  64         return cpu_possible_map;
  65 }
  66
  67 static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
  68 {
  69         return node_possible_map;
  70 }
  71
  72 static inline void cpuset_init_current_mems_allowed(void) {}
  73 static inline void cpuset_update_task_memory_state(void) {}
  74 #define cpuset_nodes_subset_current_mems_allowed(nodes) (1)
  75
  76 static inline int cpuset_zonelist_valid_mems_allowed(struct zonelist *zl)
  77 {
  78         return 1;
  79 }
  80
  81 static inline int cpuset_zone_allowed(struct zone *z, gfp_t gfp_mask)
  82 {
  83         return 1;
  84 }
  85
  86 static inline int cpuset_excl_nodes_overlap(const struct task_struct *p)
  87 {
  88         return 1;
  89 }
  90
  91 static inline void cpuset_memory_pressure_bump(void) {}
  92
  93 static inline char *cpuset_task_status_allowed(struct task_struct *task,
  94                                                         char *buffer)
  95 {
  96         return buffer;
  97 }
  98
  99 static inline void cpuset_lock(void) {}
 100 static inline void cpuset_unlock(void) {}
 101
 102 #endif /* !CONFIG_CPUSETS */
 103
 104 #endif /* _LINUX_CPUSET_H */