linux/include/linux/cpuset.h
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   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_update_active_cpus(bool cpu_online);
  24extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
  25extern void cpuset_cpus_allowed_fallback(struct task_struct *p);
  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 int cpuset_mem_spread_node(void);
  73extern int cpuset_slab_spread_node(void);
  74
  75static inline int cpuset_do_page_mem_spread(void)
  76{
  77        return current->flags & PF_SPREAD_PAGE;
  78}
  79
  80static inline int cpuset_do_slab_mem_spread(void)
  81{
  82        return current->flags & PF_SPREAD_SLAB;
  83}
  84
  85extern int current_cpuset_is_being_rebound(void);
  86
  87extern void rebuild_sched_domains(void);
  88
  89extern void cpuset_print_task_mems_allowed(struct task_struct *p);
  90
  91/*
  92 * get_mems_allowed is required when making decisions involving mems_allowed
  93 * such as during page allocation. mems_allowed can be updated in parallel
  94 * and depending on the new value an operation can fail potentially causing
  95 * process failure. A retry loop with get_mems_allowed and put_mems_allowed
  96 * prevents these artificial failures.
  97 */
  98static inline unsigned int get_mems_allowed(void)
  99{
 100        return read_seqcount_begin(&current->mems_allowed_seq);
 101}
 102
 103/*
 104 * If this returns false, the operation that took place after get_mems_allowed
 105 * may have failed. It is up to the caller to retry the operation if
 106 * appropriate.
 107 */
 108static inline bool put_mems_allowed(unsigned int seq)
 109{
 110        return !read_seqcount_retry(&current->mems_allowed_seq, seq);
 111}
 112
 113static inline void set_mems_allowed(nodemask_t nodemask)
 114{
 115        task_lock(current);
 116        write_seqcount_begin(&current->mems_allowed_seq);
 117        current->mems_allowed = nodemask;
 118        write_seqcount_end(&current->mems_allowed_seq);
 119        task_unlock(current);
 120}
 121
 122#else /* !CONFIG_CPUSETS */
 123
 124static inline int cpuset_init(void) { return 0; }
 125static inline void cpuset_init_smp(void) {}
 126
 127static inline void cpuset_update_active_cpus(bool cpu_online)
 128{
 129        partition_sched_domains(1, NULL, NULL);
 130}
 131
 132static inline void cpuset_cpus_allowed(struct task_struct *p,
 133                                       struct cpumask *mask)
 134{
 135        cpumask_copy(mask, cpu_possible_mask);
 136}
 137
 138static inline void cpuset_cpus_allowed_fallback(struct task_struct *p)
 139{
 140}
 141
 142static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
 143{
 144        return node_possible_map;
 145}
 146
 147#define cpuset_current_mems_allowed (node_states[N_HIGH_MEMORY])
 148static inline void cpuset_init_current_mems_allowed(void) {}
 149
 150static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
 151{
 152        return 1;
 153}
 154
 155static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
 156{
 157        return 1;
 158}
 159
 160static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
 161{
 162        return 1;
 163}
 164
 165static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
 166{
 167        return 1;
 168}
 169
 170static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
 171{
 172        return 1;
 173}
 174
 175static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
 176                                                 const struct task_struct *tsk2)
 177{
 178        return 1;
 179}
 180
 181static inline void cpuset_memory_pressure_bump(void) {}
 182
 183static inline void cpuset_task_status_allowed(struct seq_file *m,
 184                                                struct task_struct *task)
 185{
 186}
 187
 188static inline int cpuset_mem_spread_node(void)
 189{
 190        return 0;
 191}
 192
 193static inline int cpuset_slab_spread_node(void)
 194{
 195        return 0;
 196}
 197
 198static inline int cpuset_do_page_mem_spread(void)
 199{
 200        return 0;
 201}
 202
 203static inline int cpuset_do_slab_mem_spread(void)
 204{
 205        return 0;
 206}
 207
 208static inline int current_cpuset_is_being_rebound(void)
 209{
 210        return 0;
 211}
 212
 213static inline void rebuild_sched_domains(void)
 214{
 215        partition_sched_domains(1, NULL, NULL);
 216}
 217
 218static inline void cpuset_print_task_mems_allowed(struct task_struct *p)
 219{
 220}
 221
 222static inline void set_mems_allowed(nodemask_t nodemask)
 223{
 224}
 225
 226static inline unsigned int get_mems_allowed(void)
 227{
 228        return 0;
 229}
 230
 231static inline bool put_mems_allowed(unsigned int seq)
 232{
 233        return true;
 234}
 235
 236#endif /* !CONFIG_CPUSETS */
 237
 238#endif /* _LINUX_CPUSET_H */
 239
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