cgroup: fix comments

[linux-2.6-omap-h63xx.git] / include / linux / cgroup.h

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 9e9b7efa180b7cde94179b4691c90942a4cc44a8..2ebf7afedd9fa0cb621c144202792493ed4b80ab 100644 (file)
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -13,6 +13,8 @@
 #include <linux/cpumask.h>
 #include <linux/nodemask.h>
 #include <linux/rcupdate.h>
+#include <linux/cgroupstats.h>
+#include <linux/prio_heap.h>
 
 #ifdef CONFIG_CGROUPS
 
@@ -29,6 +31,8 @@ extern void cgroup_fork(struct task_struct *p);
 extern void cgroup_fork_callbacks(struct task_struct *p);
 extern void cgroup_post_fork(struct task_struct *p);
 extern void cgroup_exit(struct task_struct *p, int run_callbacks);
+extern int cgroupstats_build(struct cgroupstats *stats,
+                               struct dentry *dentry);
 
 extern struct file_operations proc_cgroup_operations;
 
@@ -171,7 +175,7 @@ struct css_set {
  *
  *
  * When reading/writing to a file:
- *     - the cgroup to use in file->f_dentry->d_parent->d_fsdata
+ *     - the cgroup to use is file->f_dentry->d_parent->d_fsdata
  *     - the 'cftype' of the file is file->f_dentry->d_fsdata
  */
 
@@ -204,6 +208,14 @@ struct cftype {
        int (*release) (struct inode *inode, struct file *file);
 };
 
+struct cgroup_scanner {
+       struct cgroup *cg;
+       int (*test_task)(struct task_struct *p, struct cgroup_scanner *scan);
+       void (*process_task)(struct task_struct *p,
+                       struct cgroup_scanner *scan);
+       struct ptr_heap *heap;
+};
+
 /* Add a new file to the given cgroup directory. Should only be
  * called by subsystems from within a populate() method */
 int cgroup_add_file(struct cgroup *cont, struct cgroup_subsys *subsys,
@@ -230,6 +242,7 @@ int cgroup_is_descendant(const struct cgroup *cont);
 struct cgroup_subsys {
        struct cgroup_subsys_state *(*create)(struct cgroup_subsys *ss,
                                                  struct cgroup *cont);
+       void (*pre_destroy)(struct cgroup_subsys *ss, struct cgroup *cont);
        void (*destroy)(struct cgroup_subsys *ss, struct cgroup *cont);
        int (*can_attach)(struct cgroup_subsys *ss,
                          struct cgroup *cont, struct task_struct *tsk);
@@ -295,11 +308,17 @@ struct cgroup_iter {
  *    returns NULL or until you want to end the iteration
  *
  * 3) call cgroup_iter_end() to destroy the iterator.
+ *
+ * Or, call cgroup_scan_tasks() to iterate through every task in a cpuset.
+ *    - cgroup_scan_tasks() holds the css_set_lock when calling the test_task()
+ *      callback, but not while calling the process_task() callback.
  */
 void cgroup_iter_start(struct cgroup *cont, struct cgroup_iter *it);
 struct task_struct *cgroup_iter_next(struct cgroup *cont,
                                        struct cgroup_iter *it);
 void cgroup_iter_end(struct cgroup *cont, struct cgroup_iter *it);
+int cgroup_scan_tasks(struct cgroup_scanner *scan);
+int cgroup_attach_task(struct cgroup *, struct task_struct *);
 
 #else /* !CONFIG_CGROUPS */
 
@@ -313,6 +332,11 @@ static inline void cgroup_exit(struct task_struct *p, int callbacks) {}
 
 static inline void cgroup_lock(void) {}
 static inline void cgroup_unlock(void) {}
+static inline int cgroupstats_build(struct cgroupstats *stats,
+                                       struct dentry *dentry)
+{
+       return -EINVAL;
+}
 
 #endif /* !CONFIG_CGROUPS */