1 #ifndef _LINUX_CPUSET_H
2 #define _LINUX_CPUSET_H
6 * Copyright (C) 2003 BULL SA
7 * Copyright (C) 2004-2006 Silicon Graphics, Inc.
11 #include <linux/sched.h>
12 #include <linux/cpumask.h>
13 #include <linux/nodemask.h>
15 #include <linux/jump_label.h>
19 extern struct static_key cpusets_enabled_key
;
20 static inline bool cpusets_enabled(void)
22 return static_key_false(&cpusets_enabled_key
);
25 static inline int nr_cpusets(void)
27 /* jump label reference count + the top-level cpuset */
28 return static_key_count(&cpusets_enabled_key
) + 1;
31 static inline void cpuset_inc(void)
33 static_key_slow_inc(&cpusets_enabled_key
);
36 static inline void cpuset_dec(void)
38 static_key_slow_dec(&cpusets_enabled_key
);
41 extern int cpuset_init(void);
42 extern void cpuset_init_smp(void);
43 extern void cpuset_update_active_cpus(bool cpu_online
);
44 extern void cpuset_cpus_allowed(struct task_struct
*p
, struct cpumask
*mask
);
45 extern void cpuset_cpus_allowed_fallback(struct task_struct
*p
);
46 extern nodemask_t
cpuset_mems_allowed(struct task_struct
*p
);
47 #define cpuset_current_mems_allowed (current->mems_allowed)
48 void cpuset_init_current_mems_allowed(void);
49 int cpuset_nodemask_valid_mems_allowed(nodemask_t
*nodemask
);
51 extern int __cpuset_node_allowed_softwall(int node
, gfp_t gfp_mask
);
52 extern int __cpuset_node_allowed_hardwall(int node
, gfp_t gfp_mask
);
54 static inline int cpuset_node_allowed_softwall(int node
, gfp_t gfp_mask
)
56 return nr_cpusets() <= 1 ||
57 __cpuset_node_allowed_softwall(node
, gfp_mask
);
60 static inline int cpuset_node_allowed_hardwall(int node
, gfp_t gfp_mask
)
62 return nr_cpusets() <= 1 ||
63 __cpuset_node_allowed_hardwall(node
, gfp_mask
);
66 static inline int cpuset_zone_allowed_softwall(struct zone
*z
, gfp_t gfp_mask
)
68 return cpuset_node_allowed_softwall(zone_to_nid(z
), gfp_mask
);
71 static inline int cpuset_zone_allowed_hardwall(struct zone
*z
, gfp_t gfp_mask
)
73 return cpuset_node_allowed_hardwall(zone_to_nid(z
), gfp_mask
);
76 extern int cpuset_mems_allowed_intersects(const struct task_struct
*tsk1
,
77 const struct task_struct
*tsk2
);
79 #define cpuset_memory_pressure_bump() \
81 if (cpuset_memory_pressure_enabled) \
82 __cpuset_memory_pressure_bump(); \
84 extern int cpuset_memory_pressure_enabled
;
85 extern void __cpuset_memory_pressure_bump(void);
87 extern void cpuset_task_status_allowed(struct seq_file
*m
,
88 struct task_struct
*task
);
89 extern int proc_cpuset_show(struct seq_file
*, void *);
91 extern int cpuset_mem_spread_node(void);
92 extern int cpuset_slab_spread_node(void);
94 static inline int cpuset_do_page_mem_spread(void)
96 return current
->flags
& PF_SPREAD_PAGE
;
99 static inline int cpuset_do_slab_mem_spread(void)
101 return current
->flags
& PF_SPREAD_SLAB
;
104 extern int current_cpuset_is_being_rebound(void);
106 extern void rebuild_sched_domains(void);
108 extern void cpuset_print_task_mems_allowed(struct task_struct
*p
);
111 * read_mems_allowed_begin is required when making decisions involving
112 * mems_allowed such as during page allocation. mems_allowed can be updated in
113 * parallel and depending on the new value an operation can fail potentially
114 * causing process failure. A retry loop with read_mems_allowed_begin and
115 * read_mems_allowed_retry prevents these artificial failures.
117 static inline unsigned int read_mems_allowed_begin(void)
119 return read_seqcount_begin(¤t
->mems_allowed_seq
);
123 * If this returns true, the operation that took place after
124 * read_mems_allowed_begin may have failed artificially due to a concurrent
125 * update of mems_allowed. It is up to the caller to retry the operation if
128 static inline bool read_mems_allowed_retry(unsigned int seq
)
130 return read_seqcount_retry(¤t
->mems_allowed_seq
, seq
);
133 static inline void set_mems_allowed(nodemask_t nodemask
)
138 local_irq_save(flags
);
139 write_seqcount_begin(¤t
->mems_allowed_seq
);
140 current
->mems_allowed
= nodemask
;
141 write_seqcount_end(¤t
->mems_allowed_seq
);
142 local_irq_restore(flags
);
143 task_unlock(current
);
146 #else /* !CONFIG_CPUSETS */
148 static inline bool cpusets_enabled(void) { return false; }
150 static inline int cpuset_init(void) { return 0; }
151 static inline void cpuset_init_smp(void) {}
153 static inline void cpuset_update_active_cpus(bool cpu_online
)
155 partition_sched_domains(1, NULL
, NULL
);
158 static inline void cpuset_cpus_allowed(struct task_struct
*p
,
159 struct cpumask
*mask
)
161 cpumask_copy(mask
, cpu_possible_mask
);
164 static inline void cpuset_cpus_allowed_fallback(struct task_struct
*p
)
168 static inline nodemask_t
cpuset_mems_allowed(struct task_struct
*p
)
170 return node_possible_map
;
173 #define cpuset_current_mems_allowed (node_states[N_MEMORY])
174 static inline void cpuset_init_current_mems_allowed(void) {}
176 static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t
*nodemask
)
181 static inline int cpuset_node_allowed_softwall(int node
, gfp_t gfp_mask
)
186 static inline int cpuset_node_allowed_hardwall(int node
, gfp_t gfp_mask
)
191 static inline int cpuset_zone_allowed_softwall(struct zone
*z
, gfp_t gfp_mask
)
196 static inline int cpuset_zone_allowed_hardwall(struct zone
*z
, gfp_t gfp_mask
)
201 static inline int cpuset_mems_allowed_intersects(const struct task_struct
*tsk1
,
202 const struct task_struct
*tsk2
)
207 static inline void cpuset_memory_pressure_bump(void) {}
209 static inline void cpuset_task_status_allowed(struct seq_file
*m
,
210 struct task_struct
*task
)
214 static inline int cpuset_mem_spread_node(void)
219 static inline int cpuset_slab_spread_node(void)
224 static inline int cpuset_do_page_mem_spread(void)
229 static inline int cpuset_do_slab_mem_spread(void)
234 static inline int current_cpuset_is_being_rebound(void)
239 static inline void rebuild_sched_domains(void)
241 partition_sched_domains(1, NULL
, NULL
);
244 static inline void cpuset_print_task_mems_allowed(struct task_struct
*p
)
248 static inline void set_mems_allowed(nodemask_t nodemask
)
252 static inline unsigned int read_mems_allowed_begin(void)
257 static inline bool read_mems_allowed_retry(unsigned int seq
)
262 #endif /* !CONFIG_CPUSETS */
264 #endif /* _LINUX_CPUSET_H */