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author | Tejun Heo <tj@kernel.org> | 2013-11-23 00:20:44 +0100 |
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committer | Tejun Heo <tj@kernel.org> | 2013-11-23 00:20:44 +0100 |
commit | 3bc942f372af383f49d56aab599469561a5e39ec (patch) | |
tree | 91c92e037eea3f556913a8a2f5699d58fdca5f95 /mm/memcontrol.c | |
parent | memcg: make cgroup_event deal with mem_cgroup instead of cgroup_subsys_state (diff) | |
download | linux-3bc942f372af383f49d56aab599469561a5e39ec.tar.xz linux-3bc942f372af383f49d56aab599469561a5e39ec.zip |
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>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r-- | mm/memcontrol.c | 57 |
1 files changed, 37 insertions, 20 deletions
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. |