cgroups: convert tasks file to use a seq_file with shared pid array

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

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index c98dd7cb7076f44484a68643995f10fd1bbc2ff8..8ab91880a0ad2f758882eadfba20e271ae0eb9a7 100644 (file)
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -9,12 +9,12 @@
  */
 
 #include <linux/sched.h>
-#include <linux/kref.h>
 #include <linux/cpumask.h>
 #include <linux/nodemask.h>
 #include <linux/rcupdate.h>
 #include <linux/cgroupstats.h>
 #include <linux/prio_heap.h>
+#include <linux/rwsem.h>
 
 #ifdef CONFIG_CGROUPS
 
@@ -137,6 +137,15 @@ struct cgroup {
         * release_list_lock
         */
        struct list_head release_list;
+
+       /* pids_mutex protects the fields below */
+       struct rw_semaphore pids_mutex;
+       /* Array of process ids in the cgroup */
+       pid_t *tasks_pids;
+       /* How many files are using the current tasks_pids array */
+       int pids_use_count;
+       /* Length of the current tasks_pids array */
+       int pids_length;
 };
 
 /* A css_set is a structure holding pointers to a set of
@@ -149,7 +158,7 @@ struct cgroup {
 struct css_set {
 
        /* Reference count */
-       struct kref ref;
+       atomic_t refcount;
 
        /*
         * List running through all cgroup groups in the same hash
@@ -326,7 +335,8 @@ struct cgroup_subsys {
         */
        void (*mm_owner_changed)(struct cgroup_subsys *ss,
                                        struct cgroup *old,
-                                       struct cgroup *new);
+                                       struct cgroup *new,
+                                       struct task_struct *p);
        int subsys_id;
        int active;
        int disabled;