memcg: rename cgroup_event to mem_cgroup_event

cgroup_event is only available in memcg now.  Let's brand it that way.
While at it, add a comment encouraging deprecation of the feature and
remove the respective section from cgroup documentation.

This patch is cosmetic.

v3: Typo update as per Li Zefan.

v2: Index in cgroups.txt updated accordingly as suggested by Li Zefan.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.cz>

2 files changed, 37 insertions, 40 deletions

diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt
index 638bf17ff869..821de56d1580 100644
--- a/Documentation/cgroups/cgroups.txt
+++ b/Documentation/cgroups/cgroups.txt
@@ -24,7 +24,6 @@ CONTENTS:
   2.1 Basic Usage
   2.2 Attaching processes
   2.3 Mounting hierarchies by name
-  2.4 Notification API
 3. Kernel API
   3.1 Overview
   3.2 Synchronization
@@ -472,25 +471,6 @@ you give a subsystem a name.
 The name of the subsystem appears as part of the hierarchy description
 in /proc/mounts and /proc/<pid>/cgroups.
 
-2.4 Notification API
---------------------
-
-There is mechanism which allows to get notifications about changing
-status of a cgroup.
-
-To register a new notification handler you need to:
- - create a file descriptor for event notification using eventfd(2);
- - open a control file to be monitored (e.g. memory.usage_in_bytes);
- - write "<event_fd> <control_fd> <args>" to cgroup.event_control.
-   Interpretation of args is defined by control file implementation;
-
-eventfd will be woken up by control file implementation or when the
-cgroup is removed.
-
-To unregister a notification handler just close eventfd.
-
-NOTE: Support of notifications should be implemented for the control
-file. See documentation for the subsystem.
 
 3. Kernel API
 =============
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 42f2843af1a7..ec8582b3a232 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -231,7 +231,7 @@ struct mem_cgroup_eventfd_list {
 /*
  * cgroup_event represents events which userspace want to receive.
  */
-struct cgroup_event {
+struct mem_cgroup_event {
         /*
          * memcg which the event belongs to.
          */
@@ -6002,14 +6002,27 @@ static void kmem_cgroup_css_offline(struct mem_cgroup *memcg)
 #endif
 
 /*
+ * DO NOT USE IN NEW FILES.
+ *
+ * "cgroup.event_control" implementation.
+ *
+ * This is way over-engineered.  It tries to support fully configurable
+ * events for each user.  Such level of flexibility is completely
+ * unnecessary especially in the light of the planned unified hierarchy.
+ *
+ * Please deprecate this and replace with something simpler if at all
+ * possible.
+ */
+
+/*
  * Unregister event and free resources.
  *
  * Gets called from workqueue.
  */
-static void cgroup_event_remove(struct work_struct *work)
+static void memcg_event_remove(struct work_struct *work)
 {
-        struct cgroup_event *event = container_of(work, struct cgroup_event,
-                        remove);
+        struct mem_cgroup_event *event =
+                container_of(work, struct mem_cgroup_event, remove);
         struct mem_cgroup *memcg = event->memcg;
 
         remove_wait_queue(event->wqh, &event->wait);
@@ -6029,11 +6042,11 @@ static void cgroup_event_remove(struct work_struct *work)
  *
  * Called with wqh->lock held and interrupts disabled.
  */
-static int cgroup_event_wake(wait_queue_t *wait, unsigned mode,
-                int sync, void *key)
+static int memcg_event_wake(wait_queue_t *wait, unsigned mode,
+                            int sync, void *key)
 {
-        struct cgroup_event *event = container_of(wait,
-                        struct cgroup_event, wait);
+        struct mem_cgroup_event *event =
+                container_of(wait, struct mem_cgroup_event, wait);
         struct mem_cgroup *memcg = event->memcg;
         unsigned long flags = (unsigned long)key;
 
@@ -6062,27 +6075,29 @@ static int cgroup_event_wake(wait_queue_t *wait, unsigned mode,
         return 0;
 }
 
-static void cgroup_event_ptable_queue_proc(struct file *file,
+static void memcg_event_ptable_queue_proc(struct file *file,
                 wait_queue_head_t *wqh, poll_table *pt)
 {
-        struct cgroup_event *event = container_of(pt,
-                        struct cgroup_event, pt);
+        struct mem_cgroup_event *event =
+                container_of(pt, struct mem_cgroup_event, pt);
 
         event->wqh = wqh;
         add_wait_queue(wqh, &event->wait);
 }
 
 /*
+ * DO NOT USE IN NEW FILES.
+ *
  * Parse input and register new cgroup event handler.
  *
  * Input must be in format '<event_fd> <control_fd> <args>'.
  * Interpretation of args is defined by control file implementation.
  */
-static int cgroup_write_event_control(struct cgroup_subsys_state *css,
-                                      struct cftype *cft, const char *buffer)
+static int memcg_write_event_control(struct cgroup_subsys_state *css,
+                                     struct cftype *cft, const char *buffer)
 {
         struct mem_cgroup *memcg = mem_cgroup_from_css(css);
-        struct cgroup_event *event;
+        struct mem_cgroup_event *event;
         struct cgroup_subsys_state *cfile_css;
         unsigned int efd, cfd;
         struct fd efile;
@@ -6107,9 +6122,9 @@ static int cgroup_write_event_control(struct cgroup_subsys_state *css,
 
         event->memcg = memcg;
         INIT_LIST_HEAD(&event->list);
-        init_poll_funcptr(&event->pt, cgroup_event_ptable_queue_proc);
-        init_waitqueue_func_entry(&event->wait, cgroup_event_wake);
-        INIT_WORK(&event->remove, cgroup_event_remove);
+        init_poll_funcptr(&event->pt, memcg_event_ptable_queue_proc);
+        init_waitqueue_func_entry(&event->wait, memcg_event_wake);
+        INIT_WORK(&event->remove, memcg_event_remove);
 
         efile = fdget(efd);
         if (!efile.file) {
@@ -6140,6 +6155,8 @@ static int cgroup_write_event_control(struct cgroup_subsys_state *css,
          * to be done via struct cftype but cgroup core no longer knows
          * about these events.  The following is crude but the whole thing
          * is for compatibility anyway.
+         *
+         * DO NOT ADD NEW FILES.
          */
         name = cfile.file->f_dentry->d_name.name;
 
@@ -6251,8 +6268,8 @@ static struct cftype mem_cgroup_files[] = {
                 .read_u64 = mem_cgroup_hierarchy_read,
         },
         {
-                .name = "cgroup.event_control",
-                .write_string = cgroup_write_event_control,
+                .name = "cgroup.event_control",         /* XXX: for compat */
+                .write_string = memcg_write_event_control,
                 .flags = CFTYPE_NO_PREFIX,
                 .mode = S_IWUGO,
         },
@@ -6585,7 +6602,7 @@ static void mem_cgroup_invalidate_reclaim_iterators(struct mem_cgroup *memcg)
 static void mem_cgroup_css_offline(struct cgroup_subsys_state *css)
 {
         struct mem_cgroup *memcg = mem_cgroup_from_css(css);
-        struct cgroup_event *event, *tmp;
+        struct mem_cgroup_event *event, *tmp;
 
         /*
          * Unregister events and notify userspace.