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