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/memcontrol.c b/mm/memcontrol.c
index 2fcacb1..3c93dcf 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -237,10 +237,6 @@
*/
struct cgroup_subsys_state *css;
/*
- * Control file which the event associated.
- */
- struct cftype *cft;
- /*
* eventfd to signal userspace about the event.
*/
struct eventfd_ctx *eventfd;
@@ -254,15 +250,13 @@
* on eventfd to send notification to userspace.
*/
int (*register_event)(struct cgroup_subsys_state *css,
- struct cftype *cft, struct eventfd_ctx *eventfd,
- const char *args);
+ struct eventfd_ctx *eventfd, const char *args);
/*
* unregister_event() callback will be called when userspace closes
* the eventfd or on cgroup removing. This callback must be set,
* if you want provide notification functionality.
*/
void (*unregister_event)(struct cgroup_subsys_state *css,
- struct cftype *cft,
struct eventfd_ctx *eventfd);
/*
* All fields below needed to unregister event when
@@ -5688,13 +5682,12 @@
mem_cgroup_oom_notify_cb(iter);
}
-static int mem_cgroup_usage_register_event(struct cgroup_subsys_state *css,
- struct cftype *cft, struct eventfd_ctx *eventfd, const char *args)
+static int __mem_cgroup_usage_register_event(struct cgroup_subsys_state *css,
+ struct eventfd_ctx *eventfd, const char *args, enum res_type type)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
struct mem_cgroup_thresholds *thresholds;
struct mem_cgroup_threshold_ary *new;
- enum res_type type = MEMFILE_TYPE(cft->private);
u64 threshold, usage;
int i, size, ret;
@@ -5771,13 +5764,24 @@
return ret;
}
-static void mem_cgroup_usage_unregister_event(struct cgroup_subsys_state *css,
- struct cftype *cft, struct eventfd_ctx *eventfd)
+static int mem_cgroup_usage_register_event(struct cgroup_subsys_state *css,
+ struct eventfd_ctx *eventfd, const char *args)
+{
+ return __mem_cgroup_usage_register_event(css, eventfd, args, _MEM);
+}
+
+static int memsw_cgroup_usage_register_event(struct cgroup_subsys_state *css,
+ struct eventfd_ctx *eventfd, const char *args)
+{
+ return __mem_cgroup_usage_register_event(css, eventfd, args, _MEMSWAP);
+}
+
+static void __mem_cgroup_usage_unregister_event(struct cgroup_subsys_state *css,
+ struct eventfd_ctx *eventfd, enum res_type type)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
struct mem_cgroup_thresholds *thresholds;
struct mem_cgroup_threshold_ary *new;
- enum res_type type = MEMFILE_TYPE(cft->private);
u64 usage;
int i, j, size;
@@ -5850,14 +5854,24 @@
mutex_unlock(&memcg->thresholds_lock);
}
+static void mem_cgroup_usage_unregister_event(struct cgroup_subsys_state *css,
+ struct eventfd_ctx *eventfd)
+{
+ return __mem_cgroup_usage_unregister_event(css, eventfd, _MEM);
+}
+
+static void memsw_cgroup_usage_unregister_event(struct cgroup_subsys_state *css,
+ struct eventfd_ctx *eventfd)
+{
+ return __mem_cgroup_usage_unregister_event(css, eventfd, _MEMSWAP);
+}
+
static int mem_cgroup_oom_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 mem_cgroup *memcg = mem_cgroup_from_css(css);
struct mem_cgroup_eventfd_list *event;
- enum res_type type = MEMFILE_TYPE(cft->private);
- BUG_ON(type != _OOM_TYPE);
event = kmalloc(sizeof(*event), GFP_KERNEL);
if (!event)
return -ENOMEM;
@@ -5876,13 +5890,10 @@
}
static void mem_cgroup_oom_unregister_event(struct cgroup_subsys_state *css,
- struct cftype *cft, struct eventfd_ctx *eventfd)
+ struct eventfd_ctx *eventfd)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
struct mem_cgroup_eventfd_list *ev, *tmp;
- enum res_type type = MEMFILE_TYPE(cft->private);
-
- BUG_ON(type != _OOM_TYPE);
spin_lock(&memcg_oom_lock);
@@ -6012,7 +6023,7 @@
remove_wait_queue(event->wqh, &event->wait);
- event->unregister_event(css, event->cft, event->eventfd);
+ event->unregister_event(css, event->eventfd);
/* Notify userspace the event is going away. */
eventfd_signal(event->eventfd, 1);
@@ -6133,12 +6144,6 @@
if (ret < 0)
goto out_put_cfile;
- event->cft = __file_cft(cfile.file);
- if (IS_ERR(event->cft)) {
- ret = PTR_ERR(event->cft);
- goto out_put_cfile;
- }
-
/*
* Determine the event callbacks and set them in @event. This used
* to be done via struct cftype but cgroup core no longer knows
@@ -6157,8 +6162,8 @@
event->register_event = vmpressure_register_event;
event->unregister_event = vmpressure_unregister_event;
} else if (!strcmp(name, "memory.memsw.usage_in_bytes")) {
- event->register_event = mem_cgroup_usage_register_event;
- event->unregister_event = mem_cgroup_usage_unregister_event;
+ event->register_event = memsw_cgroup_usage_register_event;
+ event->unregister_event = memsw_cgroup_usage_unregister_event;
} else {
ret = -EINVAL;
goto out_put_cfile;
@@ -6181,7 +6186,7 @@
if (ret)
goto out_put_cfile;
- ret = event->register_event(css, event->cft, event->eventfd, buffer);
+ ret = event->register_event(css, event->eventfd, buffer);
if (ret)
goto out_put_css;