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>
14 #include <linux/cgroup.h>
19 extern int number_of_cpusets; /* How many cpusets are defined in system? */
21 extern int cpuset_init(void);
22 extern void cpuset_init_smp(void);
23 extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
24 extern int 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 const struct file_operations proc_cpuset_operations;
68 extern void cpuset_task_status_allowed(struct seq_file *m,
69 struct task_struct *task);
71 extern int cpuset_mem_spread_node(void);
72 extern int cpuset_slab_spread_node(void);
74 static inline int cpuset_do_page_mem_spread(void)
76 return current->flags & PF_SPREAD_PAGE;
79 static inline int cpuset_do_slab_mem_spread(void)
81 return current->flags & PF_SPREAD_SLAB;
84 extern int current_cpuset_is_being_rebound(void);
86 extern void rebuild_sched_domains(void);
88 extern void cpuset_print_task_mems_allowed(struct task_struct *p);
91 * reading current mems_allowed and mempolicy in the fastpath must protected
92 * by get_mems_allowed()
94 static inline void get_mems_allowed(void)
96 current->mems_allowed_change_disable++;
99 * ensure that reading mems_allowed and mempolicy happens after the
100 * update of ->mems_allowed_change_disable.
102 * the write-side task finds ->mems_allowed_change_disable is not 0,
103 * and knows the read-side task is reading mems_allowed or mempolicy,
104 * so it will clear old bits lazily.
109 static inline void put_mems_allowed(void)
112 * ensure that reading mems_allowed and mempolicy before reducing
113 * mems_allowed_change_disable.
115 * the write-side task will know that the read-side task is still
116 * reading mems_allowed or mempolicy, don't clears old bits in the
120 --ACCESS_ONCE(current->mems_allowed_change_disable);
123 static inline void set_mems_allowed(nodemask_t nodemask)
126 current->mems_allowed = nodemask;
127 task_unlock(current);
130 #else /* !CONFIG_CPUSETS */
132 static inline int cpuset_init(void) { return 0; }
133 static inline void cpuset_init_smp(void) {}
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 int cpuset_cpus_allowed_fallback(struct task_struct *p)
143 cpumask_copy(&p->cpus_allowed, cpu_possible_mask);
144 return cpumask_any(cpu_active_mask);
147 static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
149 return node_possible_map;
152 #define cpuset_current_mems_allowed (node_states[N_HIGH_MEMORY])
153 static inline void cpuset_init_current_mems_allowed(void) {}
155 static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
160 static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
165 static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
170 static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
175 static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
180 static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
181 const struct task_struct *tsk2)
186 static inline void cpuset_memory_pressure_bump(void) {}
188 static inline void cpuset_task_status_allowed(struct seq_file *m,
189 struct task_struct *task)
193 static inline int cpuset_mem_spread_node(void)
198 static inline int cpuset_slab_spread_node(void)
203 static inline int cpuset_do_page_mem_spread(void)
208 static inline int cpuset_do_slab_mem_spread(void)
213 static inline int current_cpuset_is_being_rebound(void)
218 static inline void rebuild_sched_domains(void)
220 partition_sched_domains(1, NULL, NULL);
223 static inline void cpuset_print_task_mems_allowed(struct task_struct *p)
227 static inline void set_mems_allowed(nodemask_t nodemask)
231 static inline void get_mems_allowed(void)
235 static inline void put_mems_allowed(void)
239 #endif /* !CONFIG_CPUSETS */
241 #endif /* _LINUX_CPUSET_H */