Linux kernel mirror (for testing)
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1#ifndef _LINUX_CPUSET_H
2#define _LINUX_CPUSET_H
3/*
4 * cpuset interface
5 *
6 * Copyright (C) 2003 BULL SA
7 * Copyright (C) 2004-2006 Silicon Graphics, Inc.
8 *
9 */
10
11#include <linux/sched.h>
12#include <linux/cpumask.h>
13#include <linux/nodemask.h>
14#include <linux/cgroup.h>
15#include <linux/mm.h>
16
17#ifdef CONFIG_CPUSETS
18
19extern int number_of_cpusets; /* How many cpusets are defined in system? */
20
21extern int cpuset_init(void);
22extern void cpuset_init_smp(void);
23extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
24extern int cpuset_cpus_allowed_fallback(struct task_struct *p);
25extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
26#define cpuset_current_mems_allowed (current->mems_allowed)
27void cpuset_init_current_mems_allowed(void);
28int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask);
29
30extern int __cpuset_node_allowed_softwall(int node, gfp_t gfp_mask);
31extern int __cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask);
32
33static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
34{
35 return number_of_cpusets <= 1 ||
36 __cpuset_node_allowed_softwall(node, gfp_mask);
37}
38
39static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
40{
41 return number_of_cpusets <= 1 ||
42 __cpuset_node_allowed_hardwall(node, gfp_mask);
43}
44
45static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
46{
47 return cpuset_node_allowed_softwall(zone_to_nid(z), gfp_mask);
48}
49
50static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
51{
52 return cpuset_node_allowed_hardwall(zone_to_nid(z), gfp_mask);
53}
54
55extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
56 const struct task_struct *tsk2);
57
58#define cpuset_memory_pressure_bump() \
59 do { \
60 if (cpuset_memory_pressure_enabled) \
61 __cpuset_memory_pressure_bump(); \
62 } while (0)
63extern int cpuset_memory_pressure_enabled;
64extern void __cpuset_memory_pressure_bump(void);
65
66extern const struct file_operations proc_cpuset_operations;
67struct seq_file;
68extern void cpuset_task_status_allowed(struct seq_file *m,
69 struct task_struct *task);
70
71extern int cpuset_mem_spread_node(void);
72extern int cpuset_slab_spread_node(void);
73
74static inline int cpuset_do_page_mem_spread(void)
75{
76 return current->flags & PF_SPREAD_PAGE;
77}
78
79static inline int cpuset_do_slab_mem_spread(void)
80{
81 return current->flags & PF_SPREAD_SLAB;
82}
83
84extern int current_cpuset_is_being_rebound(void);
85
86extern void rebuild_sched_domains(void);
87
88extern void cpuset_print_task_mems_allowed(struct task_struct *p);
89
90/*
91 * reading current mems_allowed and mempolicy in the fastpath must protected
92 * by get_mems_allowed()
93 */
94static inline void get_mems_allowed(void)
95{
96 current->mems_allowed_change_disable++;
97
98 /*
99 * ensure that reading mems_allowed and mempolicy happens after the
100 * update of ->mems_allowed_change_disable.
101 *
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.
105 */
106 smp_mb();
107}
108
109static inline void put_mems_allowed(void)
110{
111 /*
112 * ensure that reading mems_allowed and mempolicy before reducing
113 * mems_allowed_change_disable.
114 *
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
117 * nodemask.
118 */
119 smp_mb();
120 --ACCESS_ONCE(current->mems_allowed_change_disable);
121}
122
123static inline void set_mems_allowed(nodemask_t nodemask)
124{
125 task_lock(current);
126 current->mems_allowed = nodemask;
127 task_unlock(current);
128}
129
130#else /* !CONFIG_CPUSETS */
131
132static inline int cpuset_init(void) { return 0; }
133static inline void cpuset_init_smp(void) {}
134
135static inline void cpuset_cpus_allowed(struct task_struct *p,
136 struct cpumask *mask)
137{
138 cpumask_copy(mask, cpu_possible_mask);
139}
140
141static inline int cpuset_cpus_allowed_fallback(struct task_struct *p)
142{
143 cpumask_copy(&p->cpus_allowed, cpu_possible_mask);
144 return cpumask_any(cpu_active_mask);
145}
146
147static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
148{
149 return node_possible_map;
150}
151
152#define cpuset_current_mems_allowed (node_states[N_HIGH_MEMORY])
153static inline void cpuset_init_current_mems_allowed(void) {}
154
155static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
156{
157 return 1;
158}
159
160static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
161{
162 return 1;
163}
164
165static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
166{
167 return 1;
168}
169
170static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
171{
172 return 1;
173}
174
175static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
176{
177 return 1;
178}
179
180static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
181 const struct task_struct *tsk2)
182{
183 return 1;
184}
185
186static inline void cpuset_memory_pressure_bump(void) {}
187
188static inline void cpuset_task_status_allowed(struct seq_file *m,
189 struct task_struct *task)
190{
191}
192
193static inline int cpuset_mem_spread_node(void)
194{
195 return 0;
196}
197
198static inline int cpuset_slab_spread_node(void)
199{
200 return 0;
201}
202
203static inline int cpuset_do_page_mem_spread(void)
204{
205 return 0;
206}
207
208static inline int cpuset_do_slab_mem_spread(void)
209{
210 return 0;
211}
212
213static inline int current_cpuset_is_being_rebound(void)
214{
215 return 0;
216}
217
218static inline void rebuild_sched_domains(void)
219{
220 partition_sched_domains(1, NULL, NULL);
221}
222
223static inline void cpuset_print_task_mems_allowed(struct task_struct *p)
224{
225}
226
227static inline void set_mems_allowed(nodemask_t nodemask)
228{
229}
230
231static inline void get_mems_allowed(void)
232{
233}
234
235static inline void put_mems_allowed(void)
236{
237}
238
239#endif /* !CONFIG_CPUSETS */
240
241#endif /* _LINUX_CPUSET_H */