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>
18 extern int number_of_cpusets
; /* How many cpusets are defined in system? */
20 extern int cpuset_init(void);
21 extern void cpuset_init_smp(void);
22 extern void cpuset_update_active_cpus(bool cpu_online
);
23 extern void cpuset_cpus_allowed(struct task_struct
*p
, struct cpumask
*mask
);
24 extern void cpuset_cpus_allowed_fallback(struct task_struct
*p
);
25 extern nodemask_t
cpuset_mems_allowed(struct task_struct
*p
);
26 #define cpuset_current_mems_allowed (current->mems_allowed)
27 void cpuset_init_current_mems_allowed(void);
28 int cpuset_nodemask_valid_mems_allowed(nodemask_t
*nodemask
);
30 extern int __cpuset_node_allowed_softwall(int node
, gfp_t gfp_mask
);
31 extern int __cpuset_node_allowed_hardwall(int node
, gfp_t gfp_mask
);
33 static inline int cpuset_node_allowed_softwall(int node
, gfp_t gfp_mask
)
35 return number_of_cpusets
<= 1 ||
36 __cpuset_node_allowed_softwall(node
, gfp_mask
);
39 static inline int cpuset_node_allowed_hardwall(int node
, gfp_t gfp_mask
)
41 return number_of_cpusets
<= 1 ||
42 __cpuset_node_allowed_hardwall(node
, gfp_mask
);
45 static inline int cpuset_zone_allowed_softwall(struct zone
*z
, gfp_t gfp_mask
)
47 return cpuset_node_allowed_softwall(zone_to_nid(z
), gfp_mask
);
50 static inline int cpuset_zone_allowed_hardwall(struct zone
*z
, gfp_t gfp_mask
)
52 return cpuset_node_allowed_hardwall(zone_to_nid(z
), gfp_mask
);
55 extern int cpuset_mems_allowed_intersects(const struct task_struct
*tsk1
,
56 const struct task_struct
*tsk2
);
58 #define cpuset_memory_pressure_bump() \
60 if (cpuset_memory_pressure_enabled) \
61 __cpuset_memory_pressure_bump(); \
63 extern int cpuset_memory_pressure_enabled
;
64 extern void __cpuset_memory_pressure_bump(void);
66 extern void cpuset_task_status_allowed(struct seq_file
*m
,
67 struct task_struct
*task
);
68 extern int proc_cpuset_show(struct seq_file
*, void *);
70 extern int cpuset_mem_spread_node(void);
71 extern int cpuset_slab_spread_node(void);
73 static inline int cpuset_do_page_mem_spread(void)
75 return current
->flags
& PF_SPREAD_PAGE
;
78 static inline int cpuset_do_slab_mem_spread(void)
80 return current
->flags
& PF_SPREAD_SLAB
;
83 extern int current_cpuset_is_being_rebound(void);
85 extern void rebuild_sched_domains(void);
87 extern void cpuset_print_task_mems_allowed(struct task_struct
*p
);
90 * get_mems_allowed is required when making decisions involving mems_allowed
91 * such as during page allocation. mems_allowed can be updated in parallel
92 * and depending on the new value an operation can fail potentially causing
93 * process failure. A retry loop with get_mems_allowed and put_mems_allowed
94 * prevents these artificial failures.
96 static inline unsigned int get_mems_allowed(void)
98 return read_seqcount_begin(¤t
->mems_allowed_seq
);
102 * If this returns false, the operation that took place after get_mems_allowed
103 * may have failed. It is up to the caller to retry the operation if
106 static inline bool put_mems_allowed(unsigned int seq
)
108 return !read_seqcount_retry(¤t
->mems_allowed_seq
, seq
);
111 static inline void set_mems_allowed(nodemask_t nodemask
)
116 local_irq_save(flags
);
117 write_seqcount_begin(¤t
->mems_allowed_seq
);
118 current
->mems_allowed
= nodemask
;
119 write_seqcount_end(¤t
->mems_allowed_seq
);
120 local_irq_restore(flags
);
121 task_unlock(current
);
124 #else /* !CONFIG_CPUSETS */
126 static inline int cpuset_init(void) { return 0; }
127 static inline void cpuset_init_smp(void) {}
129 static inline void cpuset_update_active_cpus(bool cpu_online
)
131 partition_sched_domains(1, NULL
, NULL
);
134 static inline void cpuset_cpus_allowed(struct task_struct
*p
,
135 struct cpumask
*mask
)
137 cpumask_copy(mask
, cpu_possible_mask
);
140 static inline void cpuset_cpus_allowed_fallback(struct task_struct
*p
)
144 static inline nodemask_t
cpuset_mems_allowed(struct task_struct
*p
)
146 return node_possible_map
;
149 #define cpuset_current_mems_allowed (node_states[N_MEMORY])
150 static inline void cpuset_init_current_mems_allowed(void) {}
152 static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t
*nodemask
)
157 static inline int cpuset_node_allowed_softwall(int node
, gfp_t gfp_mask
)
162 static inline int cpuset_node_allowed_hardwall(int node
, gfp_t gfp_mask
)
167 static inline int cpuset_zone_allowed_softwall(struct zone
*z
, gfp_t gfp_mask
)
172 static inline int cpuset_zone_allowed_hardwall(struct zone
*z
, gfp_t gfp_mask
)
177 static inline int cpuset_mems_allowed_intersects(const struct task_struct
*tsk1
,
178 const struct task_struct
*tsk2
)
183 static inline void cpuset_memory_pressure_bump(void) {}
185 static inline void cpuset_task_status_allowed(struct seq_file
*m
,
186 struct task_struct
*task
)
190 static inline int cpuset_mem_spread_node(void)
195 static inline int cpuset_slab_spread_node(void)
200 static inline int cpuset_do_page_mem_spread(void)
205 static inline int cpuset_do_slab_mem_spread(void)
210 static inline int current_cpuset_is_being_rebound(void)
215 static inline void rebuild_sched_domains(void)
217 partition_sched_domains(1, NULL
, NULL
);
220 static inline void cpuset_print_task_mems_allowed(struct task_struct
*p
)
224 static inline void set_mems_allowed(nodemask_t nodemask
)
228 static inline unsigned int get_mems_allowed(void)
233 static inline bool put_mems_allowed(unsigned int seq
)
238 #endif /* !CONFIG_CPUSETS */
240 #endif /* _LINUX_CPUSET_H */