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_update_active_cpus(void);
24 extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
25 extern int cpuset_cpus_allowed_fallback(struct task_struct *p);
26 extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
27 #define cpuset_current_mems_allowed (current->mems_allowed)
28 void cpuset_init_current_mems_allowed(void);
29 int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask);
31 extern int __cpuset_node_allowed_softwall(int node, gfp_t gfp_mask);
32 extern int __cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask);
34 static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
36 return number_of_cpusets <= 1 ||
37 __cpuset_node_allowed_softwall(node, gfp_mask);
40 static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
42 return number_of_cpusets <= 1 ||
43 __cpuset_node_allowed_hardwall(node, gfp_mask);
46 static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
48 return cpuset_node_allowed_softwall(zone_to_nid(z), gfp_mask);
51 static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
53 return cpuset_node_allowed_hardwall(zone_to_nid(z), gfp_mask);
56 extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
57 const struct task_struct *tsk2);
59 #define cpuset_memory_pressure_bump() \
61 if (cpuset_memory_pressure_enabled) \
62 __cpuset_memory_pressure_bump(); \
64 extern int cpuset_memory_pressure_enabled;
65 extern void __cpuset_memory_pressure_bump(void);
67 extern const struct file_operations proc_cpuset_operations;
69 extern void cpuset_task_status_allowed(struct seq_file *m,
70 struct task_struct *task);
72 extern int cpuset_mem_spread_node(void);
73 extern int cpuset_slab_spread_node(void);
75 static inline int cpuset_do_page_mem_spread(void)
77 return current->flags & PF_SPREAD_PAGE;
80 static inline int cpuset_do_slab_mem_spread(void)
82 return current->flags & PF_SPREAD_SLAB;
85 extern int current_cpuset_is_being_rebound(void);
87 extern void rebuild_sched_domains(void);
89 extern void cpuset_print_task_mems_allowed(struct task_struct *p);
92 * get_mems_allowed is required when making decisions involving mems_allowed
93 * such as during page allocation. mems_allowed can be updated in parallel
94 * and depending on the new value an operation can fail potentially causing
95 * process failure. A retry loop with get_mems_allowed and put_mems_allowed
96 * prevents these artificial failures.
98 static inline unsigned int get_mems_allowed(void)
100 return read_seqcount_begin(¤t->mems_allowed_seq);
104 * If this returns false, the operation that took place after get_mems_allowed
105 * may have failed. It is up to the caller to retry the operation if
108 static inline bool put_mems_allowed(unsigned int seq)
110 return !read_seqcount_retry(¤t->mems_allowed_seq, seq);
113 static inline void set_mems_allowed(nodemask_t nodemask)
116 write_seqcount_begin(¤t->mems_allowed_seq);
117 current->mems_allowed = nodemask;
118 write_seqcount_end(¤t->mems_allowed_seq);
119 task_unlock(current);
122 #else /* !CONFIG_CPUSETS */
124 static inline int cpuset_init(void) { return 0; }
125 static inline void cpuset_init_smp(void) {}
127 static inline void cpuset_update_active_cpus(void)
129 partition_sched_domains(1, NULL, NULL);
132 static inline void cpuset_cpus_allowed(struct task_struct *p,
133 struct cpumask *mask)
135 cpumask_copy(mask, cpu_possible_mask);
138 static inline int cpuset_cpus_allowed_fallback(struct task_struct *p)
140 do_set_cpus_allowed(p, cpu_possible_mask);
141 return cpumask_any(cpu_active_mask);
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_HIGH_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 */