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/mm.h>
15
16#ifdef CONFIG_CPUSETS
17
18extern int number_of_cpusets; /* How many cpusets are defined in system? */
19
20extern int cpuset_init(void);
21extern void cpuset_init_smp(void);
22extern void cpuset_update_active_cpus(bool cpu_online);
23extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
24extern void 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 void cpuset_task_status_allowed(struct seq_file *m,
67 struct task_struct *task);
68extern int proc_cpuset_show(struct seq_file *, void *);
69
70extern int cpuset_mem_spread_node(void);
71extern int cpuset_slab_spread_node(void);
72
73static inline int cpuset_do_page_mem_spread(void)
74{
75 return current->flags & PF_SPREAD_PAGE;
76}
77
78static inline int cpuset_do_slab_mem_spread(void)
79{
80 return current->flags & PF_SPREAD_SLAB;
81}
82
83extern int current_cpuset_is_being_rebound(void);
84
85extern void rebuild_sched_domains(void);
86
87extern void cpuset_print_task_mems_allowed(struct task_struct *p);
88
89/*
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.
95 */
96static inline unsigned int get_mems_allowed(void)
97{
98 return read_seqcount_begin(¤t->mems_allowed_seq);
99}
100
101/*
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
104 * appropriate.
105 */
106static inline bool put_mems_allowed(unsigned int seq)
107{
108 return !read_seqcount_retry(¤t->mems_allowed_seq, seq);
109}
110
111static inline void set_mems_allowed(nodemask_t nodemask)
112{
113 task_lock(current);
114 write_seqcount_begin(¤t->mems_allowed_seq);
115 current->mems_allowed = nodemask;
116 write_seqcount_end(¤t->mems_allowed_seq);
117 task_unlock(current);
118}
119
120#else /* !CONFIG_CPUSETS */
121
122static inline int cpuset_init(void) { return 0; }
123static inline void cpuset_init_smp(void) {}
124
125static inline void cpuset_update_active_cpus(bool cpu_online)
126{
127 partition_sched_domains(1, NULL, NULL);
128}
129
130static inline void cpuset_cpus_allowed(struct task_struct *p,
131 struct cpumask *mask)
132{
133 cpumask_copy(mask, cpu_possible_mask);
134}
135
136static inline void cpuset_cpus_allowed_fallback(struct task_struct *p)
137{
138}
139
140static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
141{
142 return node_possible_map;
143}
144
145#define cpuset_current_mems_allowed (node_states[N_MEMORY])
146static inline void cpuset_init_current_mems_allowed(void) {}
147
148static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
149{
150 return 1;
151}
152
153static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
154{
155 return 1;
156}
157
158static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
159{
160 return 1;
161}
162
163static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
164{
165 return 1;
166}
167
168static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
169{
170 return 1;
171}
172
173static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
174 const struct task_struct *tsk2)
175{
176 return 1;
177}
178
179static inline void cpuset_memory_pressure_bump(void) {}
180
181static inline void cpuset_task_status_allowed(struct seq_file *m,
182 struct task_struct *task)
183{
184}
185
186static inline int cpuset_mem_spread_node(void)
187{
188 return 0;
189}
190
191static inline int cpuset_slab_spread_node(void)
192{
193 return 0;
194}
195
196static inline int cpuset_do_page_mem_spread(void)
197{
198 return 0;
199}
200
201static inline int cpuset_do_slab_mem_spread(void)
202{
203 return 0;
204}
205
206static inline int current_cpuset_is_being_rebound(void)
207{
208 return 0;
209}
210
211static inline void rebuild_sched_domains(void)
212{
213 partition_sched_domains(1, NULL, NULL);
214}
215
216static inline void cpuset_print_task_mems_allowed(struct task_struct *p)
217{
218}
219
220static inline void set_mems_allowed(nodemask_t nodemask)
221{
222}
223
224static inline unsigned int get_mems_allowed(void)
225{
226 return 0;
227}
228
229static inline bool put_mems_allowed(unsigned int seq)
230{
231 return true;
232}
233
234#endif /* !CONFIG_CPUSETS */
235
236#endif /* _LINUX_CPUSET_H */