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 * read_mems_allowed_begin is required when making decisions involving
91 * mems_allowed such as during page allocation. mems_allowed can be updated in
92 * parallel and depending on the new value an operation can fail potentially
93 * causing process failure. A retry loop with read_mems_allowed_begin and
94 * read_mems_allowed_retry prevents these artificial failures.
96 static inline unsigned int read_mems_allowed_begin(void)
98 return read_seqcount_begin(¤t->mems_allowed_seq);
102 * If this returns true, the operation that took place after
103 * read_mems_allowed_begin may have failed artificially due to a concurrent
104 * update of mems_allowed. It is up to the caller to retry the operation if
107 static inline bool read_mems_allowed_retry(unsigned int seq)
109 return read_seqcount_retry(¤t->mems_allowed_seq, seq);
112 static inline void set_mems_allowed(nodemask_t nodemask)
117 local_irq_save(flags);
118 write_seqcount_begin(¤t->mems_allowed_seq);
119 current->mems_allowed = nodemask;
120 write_seqcount_end(¤t->mems_allowed_seq);
121 local_irq_restore(flags);
122 task_unlock(current);
125 #else /* !CONFIG_CPUSETS */
127 static inline int cpuset_init(void) { return 0; }
128 static inline void cpuset_init_smp(void) {}
130 static inline void cpuset_update_active_cpus(bool cpu_online)
132 partition_sched_domains(1, NULL, NULL);
135 static inline void cpuset_cpus_allowed(struct task_struct *p,
136 struct cpumask *mask)
138 cpumask_copy(mask, cpu_possible_mask);
141 static inline void cpuset_cpus_allowed_fallback(struct task_struct *p)
145 static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
147 return node_possible_map;
150 #define cpuset_current_mems_allowed (node_states[N_MEMORY])
151 static inline void cpuset_init_current_mems_allowed(void) {}
153 static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
158 static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
163 static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
168 static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
173 static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
178 static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
179 const struct task_struct *tsk2)
184 static inline void cpuset_memory_pressure_bump(void) {}
186 static inline void cpuset_task_status_allowed(struct seq_file *m,
187 struct task_struct *task)
191 static inline int cpuset_mem_spread_node(void)
196 static inline int cpuset_slab_spread_node(void)
201 static inline int cpuset_do_page_mem_spread(void)
206 static inline int cpuset_do_slab_mem_spread(void)
211 static inline int current_cpuset_is_being_rebound(void)
216 static inline void rebuild_sched_domains(void)
218 partition_sched_domains(1, NULL, NULL);
221 static inline void cpuset_print_task_mems_allowed(struct task_struct *p)
225 static inline void set_mems_allowed(nodemask_t nodemask)
229 static inline unsigned int read_mems_allowed_begin(void)
234 static inline bool read_mems_allowed_retry(unsigned int seq)
239 #endif /* !CONFIG_CPUSETS */
241 #endif /* _LINUX_CPUSET_H */