Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
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_update_active_cpus(bool cpu_online);
24extern void cpuset_cpus_allowed(struct task_struct *p, struct cpumask *mask);
25extern void cpuset_cpus_allowed_fallback(struct task_struct *p);
26extern nodemask_t cpuset_mems_allowed(struct task_struct *p);
27#define cpuset_current_mems_allowed (current->mems_allowed)
28void cpuset_init_current_mems_allowed(void);
29int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask);
30
31extern int __cpuset_node_allowed_softwall(int node, gfp_t gfp_mask);
32extern int __cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask);
33
34static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
35{
36 return number_of_cpusets <= 1 ||
37 __cpuset_node_allowed_softwall(node, gfp_mask);
38}
39
40static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
41{
42 return number_of_cpusets <= 1 ||
43 __cpuset_node_allowed_hardwall(node, gfp_mask);
44}
45
46static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
47{
48 return cpuset_node_allowed_softwall(zone_to_nid(z), gfp_mask);
49}
50
51static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
52{
53 return cpuset_node_allowed_hardwall(zone_to_nid(z), gfp_mask);
54}
55
56extern int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
57 const struct task_struct *tsk2);
58
59#define cpuset_memory_pressure_bump() \
60 do { \
61 if (cpuset_memory_pressure_enabled) \
62 __cpuset_memory_pressure_bump(); \
63 } while (0)
64extern int cpuset_memory_pressure_enabled;
65extern void __cpuset_memory_pressure_bump(void);
66
67extern const struct file_operations proc_cpuset_operations;
68struct seq_file;
69extern void cpuset_task_status_allowed(struct seq_file *m,
70 struct task_struct *task);
71
72extern int cpuset_mem_spread_node(void);
73extern int cpuset_slab_spread_node(void);
74
75static inline int cpuset_do_page_mem_spread(void)
76{
77 return current->flags & PF_SPREAD_PAGE;
78}
79
80static inline int cpuset_do_slab_mem_spread(void)
81{
82 return current->flags & PF_SPREAD_SLAB;
83}
84
85extern int current_cpuset_is_being_rebound(void);
86
87extern void rebuild_sched_domains(void);
88
89extern void cpuset_print_task_mems_allowed(struct task_struct *p);
90
91/*
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.
97 */
98static inline unsigned int get_mems_allowed(void)
99{
100 return read_seqcount_begin(¤t->mems_allowed_seq);
101}
102
103/*
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
106 * appropriate.
107 */
108static inline bool put_mems_allowed(unsigned int seq)
109{
110 return !read_seqcount_retry(¤t->mems_allowed_seq, seq);
111}
112
113static inline void set_mems_allowed(nodemask_t nodemask)
114{
115 task_lock(current);
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);
120}
121
122#else /* !CONFIG_CPUSETS */
123
124static inline int cpuset_init(void) { return 0; }
125static inline void cpuset_init_smp(void) {}
126
127static inline void cpuset_update_active_cpus(bool cpu_online)
128{
129 partition_sched_domains(1, NULL, NULL);
130}
131
132static inline void cpuset_cpus_allowed(struct task_struct *p,
133 struct cpumask *mask)
134{
135 cpumask_copy(mask, cpu_possible_mask);
136}
137
138static inline void cpuset_cpus_allowed_fallback(struct task_struct *p)
139{
140}
141
142static inline nodemask_t cpuset_mems_allowed(struct task_struct *p)
143{
144 return node_possible_map;
145}
146
147#define cpuset_current_mems_allowed (node_states[N_MEMORY])
148static inline void cpuset_init_current_mems_allowed(void) {}
149
150static inline int cpuset_nodemask_valid_mems_allowed(nodemask_t *nodemask)
151{
152 return 1;
153}
154
155static inline int cpuset_node_allowed_softwall(int node, gfp_t gfp_mask)
156{
157 return 1;
158}
159
160static inline int cpuset_node_allowed_hardwall(int node, gfp_t gfp_mask)
161{
162 return 1;
163}
164
165static inline int cpuset_zone_allowed_softwall(struct zone *z, gfp_t gfp_mask)
166{
167 return 1;
168}
169
170static inline int cpuset_zone_allowed_hardwall(struct zone *z, gfp_t gfp_mask)
171{
172 return 1;
173}
174
175static inline int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
176 const struct task_struct *tsk2)
177{
178 return 1;
179}
180
181static inline void cpuset_memory_pressure_bump(void) {}
182
183static inline void cpuset_task_status_allowed(struct seq_file *m,
184 struct task_struct *task)
185{
186}
187
188static inline int cpuset_mem_spread_node(void)
189{
190 return 0;
191}
192
193static inline int cpuset_slab_spread_node(void)
194{
195 return 0;
196}
197
198static inline int cpuset_do_page_mem_spread(void)
199{
200 return 0;
201}
202
203static inline int cpuset_do_slab_mem_spread(void)
204{
205 return 0;
206}
207
208static inline int current_cpuset_is_being_rebound(void)
209{
210 return 0;
211}
212
213static inline void rebuild_sched_domains(void)
214{
215 partition_sched_domains(1, NULL, NULL);
216}
217
218static inline void cpuset_print_task_mems_allowed(struct task_struct *p)
219{
220}
221
222static inline void set_mems_allowed(nodemask_t nodemask)
223{
224}
225
226static inline unsigned int get_mems_allowed(void)
227{
228 return 0;
229}
230
231static inline bool put_mems_allowed(unsigned int seq)
232{
233 return true;
234}
235
236#endif /* !CONFIG_CPUSETS */
237
238#endif /* _LINUX_CPUSET_H */