1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2
3 #ifndef __CPUSET_INTERNAL_H
4 #define __CPUSET_INTERNAL_H
5
6 #include <linux/cgroup.h>
7 #include <linux/cpu.h>
8 #include <linux/cpumask.h>
9 #include <linux/cpuset.h>
10 #include <linux/spinlock.h>
11 #include <linux/union_find.h>
12
13 /* See "Frequency meter" comments, below. */
14
15 struct fmeter {
16 int cnt; /* unprocessed events count */
17 int val; /* most recent output value */
18 time64_t time; /* clock (secs) when val computed */
19 spinlock_t lock; /* guards read or write of above */
20 };
21
22 /*
23 * Invalid partition error code
24 */
25 enum prs_errcode {
26 PERR_NONE = 0,
27 PERR_INVCPUS,
28 PERR_INVPARENT,
29 PERR_NOTPART,
30 PERR_NOTEXCL,
31 PERR_NOCPUS,
32 PERR_HOTPLUG,
33 PERR_CPUSEMPTY,
34 PERR_HKEEPING,
35 PERR_ACCESS,
36 };
37
38 /* bits in struct cpuset flags field */
39 typedef enum {
40 CS_ONLINE,
41 CS_CPU_EXCLUSIVE,
42 CS_MEM_EXCLUSIVE,
43 CS_MEM_HARDWALL,
44 CS_MEMORY_MIGRATE,
45 CS_SCHED_LOAD_BALANCE,
46 CS_SPREAD_PAGE,
47 CS_SPREAD_SLAB,
48 } cpuset_flagbits_t;
49
50 /* The various types of files and directories in a cpuset file system */
51
52 typedef enum {
53 FILE_MEMORY_MIGRATE,
54 FILE_CPULIST,
55 FILE_MEMLIST,
56 FILE_EFFECTIVE_CPULIST,
57 FILE_EFFECTIVE_MEMLIST,
58 FILE_SUBPARTS_CPULIST,
59 FILE_EXCLUSIVE_CPULIST,
60 FILE_EFFECTIVE_XCPULIST,
61 FILE_ISOLATED_CPULIST,
62 FILE_CPU_EXCLUSIVE,
63 FILE_MEM_EXCLUSIVE,
64 FILE_MEM_HARDWALL,
65 FILE_SCHED_LOAD_BALANCE,
66 FILE_PARTITION_ROOT,
67 FILE_SCHED_RELAX_DOMAIN_LEVEL,
68 FILE_MEMORY_PRESSURE_ENABLED,
69 FILE_MEMORY_PRESSURE,
70 FILE_SPREAD_PAGE,
71 FILE_SPREAD_SLAB,
72 } cpuset_filetype_t;
73
74 struct cpuset {
75 struct cgroup_subsys_state css;
76
77 unsigned long flags; /* "unsigned long" so bitops work */
78
79 /*
80 * On default hierarchy:
81 *
82 * The user-configured masks can only be changed by writing to
83 * cpuset.cpus and cpuset.mems, and won't be limited by the
84 * parent masks.
85 *
86 * The effective masks is the real masks that apply to the tasks
87 * in the cpuset. They may be changed if the configured masks are
88 * changed or hotplug happens.
89 *
90 * effective_mask == configured_mask & parent's effective_mask,
91 * and if it ends up empty, it will inherit the parent's mask.
92 *
93 *
94 * On legacy hierarchy:
95 *
96 * The user-configured masks are always the same with effective masks.
97 */
98
99 /* user-configured CPUs and Memory Nodes allow to tasks */
100 cpumask_var_t cpus_allowed;
101 nodemask_t mems_allowed;
102
103 /* effective CPUs and Memory Nodes allow to tasks */
104 cpumask_var_t effective_cpus;
105 nodemask_t effective_mems;
106
107 /*
108 * Exclusive CPUs dedicated to current cgroup (default hierarchy only)
109 *
110 * The effective_cpus of a valid partition root comes solely from its
111 * effective_xcpus and some of the effective_xcpus may be distributed
112 * to sub-partitions below & hence excluded from its effective_cpus.
113 * For a valid partition root, its effective_cpus have no relationship
114 * with cpus_allowed unless its exclusive_cpus isn't set.
115 *
116 * This value will only be set if either exclusive_cpus is set or
117 * when this cpuset becomes a local partition root.
118 */
119 cpumask_var_t effective_xcpus;
120
121 /*
122 * Exclusive CPUs as requested by the user (default hierarchy only)
123 *
124 * Its value is independent of cpus_allowed and designates the set of
125 * CPUs that can be granted to the current cpuset or its children when
126 * it becomes a valid partition root. The effective set of exclusive
127 * CPUs granted (effective_xcpus) depends on whether those exclusive
128 * CPUs are passed down by its ancestors and not yet taken up by
129 * another sibling partition root along the way.
130 *
131 * If its value isn't set, it defaults to cpus_allowed.
132 */
133 cpumask_var_t exclusive_cpus;
134
135 /*
136 * This is old Memory Nodes tasks took on.
137 *
138 * - top_cpuset.old_mems_allowed is initialized to mems_allowed.
139 * - A new cpuset's old_mems_allowed is initialized when some
140 * task is moved into it.
141 * - old_mems_allowed is used in cpuset_migrate_mm() when we change
142 * cpuset.mems_allowed and have tasks' nodemask updated, and
143 * then old_mems_allowed is updated to mems_allowed.
144 */
145 nodemask_t old_mems_allowed;
146
147 struct fmeter fmeter; /* memory_pressure filter */
148
149 /*
150 * Tasks are being attached to this cpuset. Used to prevent
151 * zeroing cpus/mems_allowed between ->can_attach() and ->attach().
152 */
153 int attach_in_progress;
154
155 /* for custom sched domain */
156 int relax_domain_level;
157
158 /* number of valid local child partitions */
159 int nr_subparts;
160
161 /* partition root state */
162 int partition_root_state;
163
164 /*
165 * number of SCHED_DEADLINE tasks attached to this cpuset, so that we
166 * know when to rebuild associated root domain bandwidth information.
167 */
168 int nr_deadline_tasks;
169 int nr_migrate_dl_tasks;
170 u64 sum_migrate_dl_bw;
171
172 /* Invalid partition error code, not lock protected */
173 enum prs_errcode prs_err;
174
175 /* Handle for cpuset.cpus.partition */
176 struct cgroup_file partition_file;
177
178 /* Remote partition silbling list anchored at remote_children */
179 struct list_head remote_sibling;
180
181 /* Used to merge intersecting subsets for generate_sched_domains */
182 struct uf_node node;
183 };
184
185 static inline struct cpuset *css_cs(struct cgroup_subsys_state *css)
186 {
187 return css ? container_of(css, struct cpuset, css) : NULL;
188 }
189
190 /* Retrieve the cpuset for a task */
191 static inline struct cpuset *task_cs(struct task_struct *task)
192 {
193 return css_cs(task_css(task, cpuset_cgrp_id));
194 }
195
196 static inline struct cpuset *parent_cs(struct cpuset *cs)
197 {
198 return css_cs(cs->css.parent);
199 }
200
201 /* convenient tests for these bits */
202 static inline bool is_cpuset_online(struct cpuset *cs)
203 {
204 return test_bit(CS_ONLINE, &cs->flags) && !css_is_dying(&cs->css);
205 }
206
207 static inline int is_cpu_exclusive(const struct cpuset *cs)
208 {
209 return test_bit(CS_CPU_EXCLUSIVE, &cs->flags);
210 }
211
212 static inline int is_mem_exclusive(const struct cpuset *cs)
213 {
214 return test_bit(CS_MEM_EXCLUSIVE, &cs->flags);
215 }
216
217 static inline int is_mem_hardwall(const struct cpuset *cs)
218 {
219 return test_bit(CS_MEM_HARDWALL, &cs->flags);
220 }
221
222 static inline int is_sched_load_balance(const struct cpuset *cs)
223 {
224 return test_bit(CS_SCHED_LOAD_BALANCE, &cs->flags);
225 }
226
227 static inline int is_memory_migrate(const struct cpuset *cs)
228 {
229 return test_bit(CS_MEMORY_MIGRATE, &cs->flags);
230 }
231
232 static inline int is_spread_page(const struct cpuset *cs)
233 {
234 return test_bit(CS_SPREAD_PAGE, &cs->flags);
235 }
236
237 static inline int is_spread_slab(const struct cpuset *cs)
238 {
239 return test_bit(CS_SPREAD_SLAB, &cs->flags);
240 }
241
242 /**
243 * cpuset_for_each_child - traverse online children of a cpuset
244 * @child_cs: loop cursor pointing to the current child
245 * @pos_css: used for iteration
246 * @parent_cs: target cpuset to walk children of
247 *
248 * Walk @child_cs through the online children of @parent_cs. Must be used
249 * with RCU read locked.
250 */
251 #define cpuset_for_each_child(child_cs, pos_css, parent_cs) \
252 css_for_each_child((pos_css), &(parent_cs)->css) \
253 if (is_cpuset_online(((child_cs) = css_cs((pos_css)))))
254
255 /**
256 * cpuset_for_each_descendant_pre - pre-order walk of a cpuset's descendants
257 * @des_cs: loop cursor pointing to the current descendant
258 * @pos_css: used for iteration
259 * @root_cs: target cpuset to walk ancestor of
260 *
261 * Walk @des_cs through the online descendants of @root_cs. Must be used
262 * with RCU read locked. The caller may modify @pos_css by calling
263 * css_rightmost_descendant() to skip subtree. @root_cs is included in the
264 * iteration and the first node to be visited.
265 */
266 #define cpuset_for_each_descendant_pre(des_cs, pos_css, root_cs) \
267 css_for_each_descendant_pre((pos_css), &(root_cs)->css) \
268 if (is_cpuset_online(((des_cs) = css_cs((pos_css)))))
269
270 void rebuild_sched_domains_locked(void);
271 void cpuset_callback_lock_irq(void);
272 void cpuset_callback_unlock_irq(void);
273 void cpuset_update_tasks_cpumask(struct cpuset *cs, struct cpumask *new_cpus);
274 void cpuset_update_tasks_nodemask(struct cpuset *cs);
275 int cpuset_update_flag(cpuset_flagbits_t bit, struct cpuset *cs, int turning_on);
276 ssize_t cpuset_write_resmask(struct kernfs_open_file *of,
277 char *buf, size_t nbytes, loff_t off);
278 int cpuset_common_seq_show(struct seq_file *sf, void *v);
279
280 /*
281 * cpuset-v1.c
282 */
283 #ifdef CONFIG_CPUSETS_V1
284 extern struct cftype cpuset1_files[];
285 void fmeter_init(struct fmeter *fmp);
286 void cpuset1_update_task_spread_flags(struct cpuset *cs,
287 struct task_struct *tsk);
288 void cpuset1_update_tasks_flags(struct cpuset *cs);
289 void cpuset1_hotplug_update_tasks(struct cpuset *cs,
290 struct cpumask *new_cpus, nodemask_t *new_mems,
291 bool cpus_updated, bool mems_updated);
292 int cpuset1_validate_change(struct cpuset *cur, struct cpuset *trial);
293 #else
294 static inline void fmeter_init(struct fmeter *fmp) {}
295 static inline void cpuset1_update_task_spread_flags(struct cpuset *cs,
296 struct task_struct *tsk) {}
297 static inline void cpuset1_update_tasks_flags(struct cpuset *cs) {}
298 static inline void cpuset1_hotplug_update_tasks(struct cpuset *cs,
299 struct cpumask *new_cpus, nodemask_t *new_mems,
300 bool cpus_updated, bool mems_updated) {}
301 static inline int cpuset1_validate_change(struct cpuset *cur,
302 struct cpuset *trial) { return 0; }
303 #endif /* CONFIG_CPUSETS_V1 */
304
305 #endif /* __CPUSET_INTERNAL_H */
306
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.