memcg: remove cgroup_event->cft
The only use of cgroup_event->cft is distinguishing "usage_in_bytes"
and "memsw.usgae_in_bytes" for mem_cgroup_usage_[un]register_event(),
which can be done by adding an explicit argument to the function and
implementing two wrappers so that the two cases can be distinguished
from the function alone.
Remove cgroup_event->cft and the related code including
[un]register_events() methods.
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>
diff --git a/mm/vmpressure.c b/mm/vmpressure.c
index e0f6283..0f25a99 100644
--- a/mm/vmpressure.c
+++ b/mm/vmpressure.c
@@ -279,7 +279,6 @@
/**
* vmpressure_register_event() - Bind vmpressure notifications to an eventfd
* @css: css that is interested in vmpressure notifications
- * @cft: cgroup control files handle
* @eventfd: eventfd context to link notifications with
* @args: event arguments (used to set up a pressure level threshold)
*
@@ -289,13 +288,10 @@
* threshold (one of vmpressure_str_levels, i.e. "low", "medium", or
* "critical").
*
- * This function should not be used directly, just pass it to (struct
- * cftype).register_event, and then cgroup core will handle everything by
- * itself.
+ * To be used as memcg event method.
*/
int vmpressure_register_event(struct cgroup_subsys_state *css,
- struct cftype *cft, struct eventfd_ctx *eventfd,
- const char *args)
+ struct eventfd_ctx *eventfd, const char *args)
{
struct vmpressure *vmpr = css_to_vmpressure(css);
struct vmpressure_event *ev;
@@ -326,19 +322,15 @@
/**
* vmpressure_unregister_event() - Unbind eventfd from vmpressure
* @css: css handle
- * @cft: cgroup control files handle
* @eventfd: eventfd context that was used to link vmpressure with the @cg
*
* This function does internal manipulations to detach the @eventfd from
* the vmpressure notifications, and then frees internal resources
* associated with the @eventfd (but the @eventfd itself is not freed).
*
- * This function should not be used directly, just pass it to (struct
- * cftype).unregister_event, and then cgroup core will handle everything
- * by itself.
+ * To be used as memcg event method.
*/
void vmpressure_unregister_event(struct cgroup_subsys_state *css,
- struct cftype *cft,
struct eventfd_ctx *eventfd)
{
struct vmpressure *vmpr = css_to_vmpressure(css);