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-rw-r--r--include/linux/cgroup.h89
1 files changed, 79 insertions, 10 deletions
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index a9553568118f..836b3557bb76 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -27,10 +27,19 @@ extern void cgroup_lock(void);
27extern void cgroup_unlock(void); 27extern void cgroup_unlock(void);
28extern void cgroup_fork(struct task_struct *p); 28extern void cgroup_fork(struct task_struct *p);
29extern void cgroup_fork_callbacks(struct task_struct *p); 29extern void cgroup_fork_callbacks(struct task_struct *p);
30extern void cgroup_post_fork(struct task_struct *p);
30extern void cgroup_exit(struct task_struct *p, int run_callbacks); 31extern void cgroup_exit(struct task_struct *p, int run_callbacks);
31 32
32extern struct file_operations proc_cgroup_operations; 33extern struct file_operations proc_cgroup_operations;
33 34
35/* Define the enumeration of all cgroup subsystems */
36#define SUBSYS(_x) _x ## _subsys_id,
37enum cgroup_subsys_id {
38#include <linux/cgroup_subsys.h>
39 CGROUP_SUBSYS_COUNT
40};
41#undef SUBSYS
42
34/* Per-subsystem/per-cgroup state maintained by the system. */ 43/* Per-subsystem/per-cgroup state maintained by the system. */
35struct cgroup_subsys_state { 44struct cgroup_subsys_state {
36 /* The cgroup that this subsystem is attached to. Useful 45 /* The cgroup that this subsystem is attached to. Useful
@@ -97,6 +106,52 @@ struct cgroup {
97 106
98 struct cgroupfs_root *root; 107 struct cgroupfs_root *root;
99 struct cgroup *top_cgroup; 108 struct cgroup *top_cgroup;
109
110 /*
111 * List of cg_cgroup_links pointing at css_sets with
112 * tasks in this cgroup. Protected by css_set_lock
113 */
114 struct list_head css_sets;
115};
116
117/* A css_set is a structure holding pointers to a set of
118 * cgroup_subsys_state objects. This saves space in the task struct
119 * object and speeds up fork()/exit(), since a single inc/dec and a
120 * list_add()/del() can bump the reference count on the entire
121 * cgroup set for a task.
122 */
123
124struct css_set {
125
126 /* Reference count */
127 struct kref ref;
128
129 /*
130 * List running through all cgroup groups. Protected by
131 * css_set_lock
132 */
133 struct list_head list;
134
135 /*
136 * List running through all tasks using this cgroup
137 * group. Protected by css_set_lock
138 */
139 struct list_head tasks;
140
141 /*
142 * List of cg_cgroup_link objects on link chains from
143 * cgroups referenced from this css_set. Protected by
144 * css_set_lock
145 */
146 struct list_head cg_links;
147
148 /*
149 * Set of subsystem states, one for each subsystem. This array
150 * is immutable after creation apart from the init_css_set
151 * during subsystem registration (at boot time).
152 */
153 struct cgroup_subsys_state *subsys[CGROUP_SUBSYS_COUNT];
154
100}; 155};
101 156
102/* struct cftype: 157/* struct cftype:
@@ -157,15 +212,7 @@ int cgroup_is_removed(const struct cgroup *cont);
157 212
158int cgroup_path(const struct cgroup *cont, char *buf, int buflen); 213int cgroup_path(const struct cgroup *cont, char *buf, int buflen);
159 214
160int __cgroup_task_count(const struct cgroup *cont); 215int cgroup_task_count(const struct cgroup *cont);
161static inline int cgroup_task_count(const struct cgroup *cont)
162{
163 int task_count;
164 rcu_read_lock();
165 task_count = __cgroup_task_count(cont);
166 rcu_read_unlock();
167 return task_count;
168}
169 216
170/* Return true if the cgroup is a descendant of the current cgroup */ 217/* Return true if the cgroup is a descendant of the current cgroup */
171int cgroup_is_descendant(const struct cgroup *cont); 218int cgroup_is_descendant(const struct cgroup *cont);
@@ -213,7 +260,7 @@ static inline struct cgroup_subsys_state *cgroup_subsys_state(
213static inline struct cgroup_subsys_state *task_subsys_state( 260static inline struct cgroup_subsys_state *task_subsys_state(
214 struct task_struct *task, int subsys_id) 261 struct task_struct *task, int subsys_id)
215{ 262{
216 return rcu_dereference(task->cgroups.subsys[subsys_id]); 263 return rcu_dereference(task->cgroups->subsys[subsys_id]);
217} 264}
218 265
219static inline struct cgroup* task_cgroup(struct task_struct *task, 266static inline struct cgroup* task_cgroup(struct task_struct *task,
@@ -226,6 +273,27 @@ int cgroup_path(const struct cgroup *cont, char *buf, int buflen);
226 273
227int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *ss); 274int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *ss);
228 275
276/* A cgroup_iter should be treated as an opaque object */
277struct cgroup_iter {
278 struct list_head *cg_link;
279 struct list_head *task;
280};
281
282/* To iterate across the tasks in a cgroup:
283 *
284 * 1) call cgroup_iter_start to intialize an iterator
285 *
286 * 2) call cgroup_iter_next() to retrieve member tasks until it
287 * returns NULL or until you want to end the iteration
288 *
289 * 3) call cgroup_iter_end() to destroy the iterator.
290 */
291void cgroup_iter_start(struct cgroup *cont, struct cgroup_iter *it);
292struct task_struct *cgroup_iter_next(struct cgroup *cont,
293 struct cgroup_iter *it);
294void cgroup_iter_end(struct cgroup *cont, struct cgroup_iter *it);
295
296
229#else /* !CONFIG_CGROUPS */ 297#else /* !CONFIG_CGROUPS */
230 298
231static inline int cgroup_init_early(void) { return 0; } 299static inline int cgroup_init_early(void) { return 0; }
@@ -233,6 +301,7 @@ static inline int cgroup_init(void) { return 0; }
233static inline void cgroup_init_smp(void) {} 301static inline void cgroup_init_smp(void) {}
234static inline void cgroup_fork(struct task_struct *p) {} 302static inline void cgroup_fork(struct task_struct *p) {}
235static inline void cgroup_fork_callbacks(struct task_struct *p) {} 303static inline void cgroup_fork_callbacks(struct task_struct *p) {}
304static inline void cgroup_post_fork(struct task_struct *p) {}
236static inline void cgroup_exit(struct task_struct *p, int callbacks) {} 305static inline void cgroup_exit(struct task_struct *p, int callbacks) {}
237 306
238static inline void cgroup_lock(void) {} 307static inline void cgroup_lock(void) {}