LXR linux/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#include <linux/mm.h>
  16
  17#ifdef CONFIG_CPUSETS
  18
  19extern int number_of_cpusets;   /* How many cpusets are defined in system? */
  20
  21extern int cpuset_init(void);
  22extern void cpuset_init_smp(void);
  23extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
  24extern void cpuset_cpus_allowed_locked(struct task_struct *p,
  25                                       struct cpumask *mask);
  26extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
  27#define cpuset_current_mems_allowed (current->mems_allowed)
  28void cpuset_init_current_mems_allowed(void);
  29int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask);
  30
  31extern int __cpuset_node_allowed_softwall(int node, gfp_t gfp_mask);
  32extern int __cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask);
  33
  34static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
  35{
  36        return number_of_cpusets <= 1 ||
  37                __cpuset_node_allowed_softwall(node, gfp_mask);
  38}
  39
  40static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
  41{
  42        return number_of_cpusets <= 1 ||
  43                __cpuset_node_allowed_hardwall(node, gfp_mask);
  44}
  45
  46static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
  47{
  48        return cpuset_node_allowed_softwall(zone_to_nid(z), gfp_mask);
  49}
  50
  51static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
  52{
  53        return cpuset_node_allowed_hardwall(zone_to_nid(z), gfp_mask);
  54}
  55
  56extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
  57                                          const struct task_struct *tsk2);
  58
  59#define cpuset_memory_pressure_bump()                           \
  60        do {                                                    \
  61                if (cpuset_memory_pressure_enabled)             \
  62                        __cpuset_memory_pressure_bump();        \
  63        } while (0)
  64extern int cpuset_memory_pressure_enabled;
  65extern void __cpuset_memory_pressure_bump(void);
  66
  67extern const struct file_operations proc_cpuset_operations;
  68struct seq_file;
  69extern void cpuset_task_status_allowed(struct seq_file *m,
  70                                        struct task_struct *task);
  71
  72extern void cpuset_lock(void);
  73extern void cpuset_unlock(void);
  74
  75extern int cpuset_mem_spread_node(void);
  76
  77static inline int cpuset_do_page_mem_spread(void)
  78{
  79        return current->flags & PF_SPREAD_PAGE;
  80}
  81
  82static inline int cpuset_do_slab_mem_spread(void)
  83{
  84        return current->flags & PF_SPREAD_SLAB;
  85}
  86
  87extern int current_cpuset_is_being_rebound(void);
  88
  89extern void rebuild_sched_domains(void);
  90
  91extern void cpuset_print_task_mems_allowed(struct task_struct *p);
  92
  93static inline void set_mems_allowed(nodemask_t nodemask)
  94{
  95        current->mems_allowed = nodemask;
  96}
  97
  98#else /* !CONFIG_CPUSETS */
  99
 100static inline int cpuset_init(void) { return 0; }
 101static inline void cpuset_init_smp(void) {}
 102
 103static inline void cpuset_cpus_allowed(struct task_struct *p,
 104                                       struct cpumask *mask)
 105{
 106        cpumask_copy(mask, cpu_possible_mask);
 107}
 108static inline void cpuset_cpus_allowed_locked(struct task_struct *p,
 109                                              struct cpumask *mask)
 110{
 111        cpumask_copy(mask, cpu_possible_mask);
 112}
 113
 114static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
 115{
 116        return node_possible_map;
 117}
 118
 119#define cpuset_current_mems_allowed (node_states[N_HIGH_MEMORY])
 120static inline void cpuset_init_current_mems_allowed(void) {}
 121
 122static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
 123{
 124        return 1;
 125}
 126
 127static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
 128{
 129        return 1;
 130}
 131
 132static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
 133{
 134        return 1;
 135}
 136
 137static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
 138{
 139        return 1;
 140}
 141
 142static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
 143{
 144        return 1;
 145}
 146
 147static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
 148                                                 const struct task_struct *tsk2)
 149{
 150        return 1;
 151}
 152
 153static inline void cpuset_memory_pressure_bump(void) {}
 154
 155static inline void cpuset_task_status_allowed(struct seq_file *m,
 156                                                struct task_struct *task)
 157{
 158}
 159
 160static inline void cpuset_lock(void) {}
 161static inline void cpuset_unlock(void) {}
 162
 163static inline int cpuset_mem_spread_node(void)
 164{
 165        return 0;
 166}
 167
 168static inline int cpuset_do_page_mem_spread(void)
 169{
 170        return 0;
 171}
 172
 173static inline int cpuset_do_slab_mem_spread(void)
 174{
 175        return 0;
 176}
 177
 178static inline int current_cpuset_is_being_rebound(void)
 179{
 180        return 0;
 181}
 182
 183static inline void rebuild_sched_domains(void)
 184{
 185        partition_sched_domains(1, NULL, NULL);
 186}
 187
 188static inline void cpuset_print_task_mems_allowed(struct task_struct *p)
 189{
 190}
 191
 192static inline void set_mems_allowed(nodemask_t nodemask)
 193{
 194}
 195
 196#endif /* !CONFIG_CPUSETS */
 197
 198#endif /* _LINUX_CPUSET_H */
 199