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_false cpusets_enabled_key
;
20 static inline bool cpusets_enabled(void)
22 return static_branch_unlikely(&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
.key
) + 1;
31 static inline void cpuset_inc(void)
33 static_branch_inc(&cpusets_enabled_key
);
36 static inline void cpuset_dec(void)
38 static_branch_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 bool __cpuset_node_allowed(int node
, gfp_t gfp_mask
);
53 static inline bool cpuset_node_allowed(int node
, gfp_t gfp_mask
)
55 if (cpusets_enabled())
56 return __cpuset_node_allowed(node
, gfp_mask
);
60 static inline bool __cpuset_zone_allowed(struct zone
*z
, gfp_t gfp_mask
)
62 return __cpuset_node_allowed(zone_to_nid(z
), gfp_mask
);
65 static inline bool cpuset_zone_allowed(struct zone
*z
, gfp_t gfp_mask
)
67 if (cpusets_enabled())
68 return __cpuset_zone_allowed(z
, gfp_mask
);
72 extern int cpuset_mems_allowed_intersects(const struct task_struct
*tsk1
,
73 const struct task_struct
*tsk2
);
75 #define cpuset_memory_pressure_bump() \
77 if (cpuset_memory_pressure_enabled) \
78 __cpuset_memory_pressure_bump(); \
80 extern int cpuset_memory_pressure_enabled
;
81 extern void __cpuset_memory_pressure_bump(void);
83 extern void cpuset_task_status_allowed(struct seq_file
*m
,
84 struct task_struct
*task
);
85 extern int proc_cpuset_show(struct seq_file
*m
, struct pid_namespace
*ns
,
86 struct pid
*pid
, struct task_struct
*tsk
);
88 extern int cpuset_mem_spread_node(void);
89 extern int cpuset_slab_spread_node(void);
91 static inline int cpuset_do_page_mem_spread(void)
93 return task_spread_page(current
);
96 static inline int cpuset_do_slab_mem_spread(void)
98 return task_spread_slab(current
);
101 extern int current_cpuset_is_being_rebound(void);
103 extern void rebuild_sched_domains(void);
105 extern void cpuset_print_current_mems_allowed(void);
108 * read_mems_allowed_begin is required when making decisions involving
109 * mems_allowed such as during page allocation. mems_allowed can be updated in
110 * parallel and depending on the new value an operation can fail potentially
111 * causing process failure. A retry loop with read_mems_allowed_begin and
112 * read_mems_allowed_retry prevents these artificial failures.
114 static inline unsigned int read_mems_allowed_begin(void)
116 if (!cpusets_enabled())
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 if (!cpusets_enabled())
133 return read_seqcount_retry(¤t
->mems_allowed_seq
, seq
);
136 static inline void set_mems_allowed(nodemask_t nodemask
)
141 local_irq_save(flags
);
142 write_seqcount_begin(¤t
->mems_allowed_seq
);
143 current
->mems_allowed
= nodemask
;
144 write_seqcount_end(¤t
->mems_allowed_seq
);
145 local_irq_restore(flags
);
146 task_unlock(current
);
149 #else /* !CONFIG_CPUSETS */
151 static inline bool cpusets_enabled(void) { return false; }
153 static inline int cpuset_init(void) { return 0; }
154 static inline void cpuset_init_smp(void) {}
156 static inline void cpuset_update_active_cpus(bool cpu_online
)
158 partition_sched_domains(1, NULL
, NULL
);
161 static inline void cpuset_cpus_allowed(struct task_struct
*p
,
162 struct cpumask
*mask
)
164 cpumask_copy(mask
, cpu_possible_mask
);
167 static inline void cpuset_cpus_allowed_fallback(struct task_struct
*p
)
171 static inline nodemask_t
cpuset_mems_allowed(struct task_struct
*p
)
173 return node_possible_map
;
176 #define cpuset_current_mems_allowed (node_states[N_MEMORY])
177 static inline void cpuset_init_current_mems_allowed(void) {}
179 static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t
*nodemask
)
184 static inline bool cpuset_node_allowed(int node
, gfp_t gfp_mask
)
189 static inline bool __cpuset_zone_allowed(struct zone
*z
, gfp_t gfp_mask
)
194 static inline bool cpuset_zone_allowed(struct zone
*z
, gfp_t gfp_mask
)
199 static inline int cpuset_mems_allowed_intersects(const struct task_struct
*tsk1
,
200 const struct task_struct
*tsk2
)
205 static inline void cpuset_memory_pressure_bump(void) {}
207 static inline void cpuset_task_status_allowed(struct seq_file
*m
,
208 struct task_struct
*task
)
212 static inline int cpuset_mem_spread_node(void)
217 static inline int cpuset_slab_spread_node(void)
222 static inline int cpuset_do_page_mem_spread(void)
227 static inline int cpuset_do_slab_mem_spread(void)
232 static inline int current_cpuset_is_being_rebound(void)
237 static inline void rebuild_sched_domains(void)
239 partition_sched_domains(1, NULL
, NULL
);
242 static inline void cpuset_print_current_mems_allowed(void)
246 static inline void set_mems_allowed(nodemask_t nodemask
)
250 static inline unsigned int read_mems_allowed_begin(void)
255 static inline bool read_mems_allowed_retry(unsigned int seq
)
260 #endif /* !CONFIG_CPUSETS */
262 #endif /* _LINUX_CPUSET_H */