- Update to 2.6.25-rc3.

[linux-flexiantxendom0-3.2.10.git] / include / linux / cgroup.h

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 8747932..028ba3b 100644 (file)
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -14,6 +14,7 @@
 #include <linux/nodemask.h>
 #include <linux/rcupdate.h>
 #include <linux/cgroupstats.h>
+#include <linux/prio_heap.h>
 
 #ifdef CONFIG_CGROUPS
 
@@ -174,7 +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
  */
 
@@ -185,15 +186,15 @@ struct cftype {
        char name[MAX_CFTYPE_NAME];
        int private;
        int (*open) (struct inode *inode, struct file *file);
-       ssize_t (*read) (struct cgroup *cont, struct cftype *cft,
+       ssize_t (*read) (struct cgroup *cgrp, struct cftype *cft,
                         struct file *file,
                         char __user *buf, size_t nbytes, loff_t *ppos);
        /*
         * read_uint() is a shortcut for the common case of returning a
         * single integer. Use it in place of read()
         */
-       u64 (*read_uint) (struct cgroup *cont, struct cftype *cft);
-       ssize_t (*write) (struct cgroup *cont, struct cftype *cft,
+       u64 (*read_uint) (struct cgroup *cgrp, struct cftype *cft);
+       ssize_t (*write) (struct cgroup *cgrp, struct cftype *cft,
                          struct file *file,
                          const char __user *buf, size_t nbytes, loff_t *ppos);
 
@@ -202,47 +203,56 @@ struct cftype {
         * a single integer (as parsed by simple_strtoull) from
         * userspace. Use in place of write(); return 0 or error.
         */
-       int (*write_uint) (struct cgroup *cont, struct cftype *cft, u64 val);
+       int (*write_uint) (struct cgroup *cgrp, struct cftype *cft, u64 val);
 
        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,
+int cgroup_add_file(struct cgroup *cgrp, struct cgroup_subsys *subsys,
                       const struct cftype *cft);
 
 /* Add a set of new files to the given cgroup directory. Should
  * only be called by subsystems from within a populate() method */
-int cgroup_add_files(struct cgroup *cont,
+int cgroup_add_files(struct cgroup *cgrp,
                        struct cgroup_subsys *subsys,
                        const struct cftype cft[],
                        int count);
 
-int cgroup_is_removed(const struct cgroup *cont);
+int cgroup_is_removed(const struct cgroup *cgrp);
 
-int cgroup_path(const struct cgroup *cont, char *buf, int buflen);
+int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen);
 
-int cgroup_task_count(const struct cgroup *cont);
+int cgroup_task_count(const struct cgroup *cgrp);
 
 /* Return true if the cgroup is a descendant of the current cgroup */
-int cgroup_is_descendant(const struct cgroup *cont);
+int cgroup_is_descendant(const struct cgroup *cgrp);
 
 /* Control Group subsystem type. See Documentation/cgroups.txt for details */
 
 struct cgroup_subsys {
        struct cgroup_subsys_state *(*create)(struct cgroup_subsys *ss,
-                                                 struct cgroup *cont);
-       void (*destroy)(struct cgroup_subsys *ss, struct cgroup *cont);
+                                                 struct cgroup *cgrp);
+       void (*pre_destroy)(struct cgroup_subsys *ss, struct cgroup *cgrp);
+       void (*destroy)(struct cgroup_subsys *ss, struct cgroup *cgrp);
        int (*can_attach)(struct cgroup_subsys *ss,
-                         struct cgroup *cont, struct task_struct *tsk);
-       void (*attach)(struct cgroup_subsys *ss, struct cgroup *cont,
-                       struct cgroup *old_cont, struct task_struct *tsk);
+                         struct cgroup *cgrp, struct task_struct *tsk);
+       void (*attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,
+                       struct cgroup *old_cgrp, struct task_struct *tsk);
        void (*fork)(struct cgroup_subsys *ss, struct task_struct *task);
        void (*exit)(struct cgroup_subsys *ss, struct task_struct *task);
        int (*populate)(struct cgroup_subsys *ss,
-                       struct cgroup *cont);
-       void (*post_clone)(struct cgroup_subsys *ss, struct cgroup *cont);
+                       struct cgroup *cgrp);
+       void (*post_clone)(struct cgroup_subsys *ss, struct cgroup *cgrp);
        void (*bind)(struct cgroup_subsys *ss, struct cgroup *root);
        int subsys_id;
        int active;
@@ -263,9 +273,9 @@ struct cgroup_subsys {
 #undef SUBSYS
 
 static inline struct cgroup_subsys_state *cgroup_subsys_state(
-       struct cgroup *cont, int subsys_id)
+       struct cgroup *cgrp, int subsys_id)
 {
-       return cont->subsys[subsys_id];
+       return cgrp->subsys[subsys_id];
 }
 
 static inline struct cgroup_subsys_state *task_subsys_state(
@@ -280,8 +290,6 @@ static inline struct cgroup* task_cgroup(struct task_struct *task,
        return task_subsys_state(task, subsys_id)->cgroup;
 }
 
-int cgroup_path(const struct cgroup *cont, char *buf, int buflen);
-
 int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *ss);
 
 /* A cgroup_iter should be treated as an opaque object */
@@ -298,11 +306,17 @@ 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,
+void cgroup_iter_start(struct cgroup *cgrp, struct cgroup_iter *it);
+struct task_struct *cgroup_iter_next(struct cgroup *cgrp,
                                        struct cgroup_iter *it);
-void cgroup_iter_end(struct cgroup *cont, struct cgroup_iter *it);
+void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it);
+int cgroup_scan_tasks(struct cgroup_scanner *scan);
+int cgroup_attach_task(struct cgroup *, struct task_struct *);
 
 #else /* !CONFIG_CGROUPS */