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cgroups: remove events before destroying subsystem state objects

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Events should be removed after rmdir of cgroup directory, but before
destroying subsystem state objects.  Let's take reference to cgroup
directory dentry to do that.

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hioryu@jp.fujitsu.com>
Cc: Paul Menage <menage@google.com>
Acked-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Balbir Singh <balbir@linux.vnet.ibm.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: Dan Malek <dan@embeddedalley.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov 2010-03-10 15:22:34 -08:00 committed by Linus Torvalds
parent 4ab78683c1
commit a0a4db548e
3 changed files with 8 additions and 12 deletions
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3
include/linux/cgroup.h
View File

@ -396,9 +396,6 @@ struct cftype {
* closes the eventfd or on cgroup removing.
* This callback must be implemented, if you want provide
* notification functionality.
*
* Be careful. It can be called after destroy(), so you have
* to keep all nesessary data, until all events are removed.
*/
int (*unregister_event)(struct cgroup *cgrp, struct cftype *cft,
struct eventfd_ctx *eventfd);

8
kernel/cgroup.c
View File

@ -2994,6 +2994,7 @@ static void cgroup_event_remove(struct work_struct *work)
eventfd_ctx_put(event->eventfd);
kfree(event);
dput(cgrp->dentry);
}
/*
@ -3114,6 +3115,13 @@ static int cgroup_write_event_control(struct cgroup *cgrp, struct cftype *cft,
goto fail;
}
/*
* Events should be removed after rmdir of cgroup directory, but before
* destroying subsystem state objects. Let's take reference to cgroup
* directory dentry to do that.
*/
dget(cgrp->dentry);
spin_lock(&cgrp->event_list_lock);
list_add(&event->list, &cgrp->event_list);
spin_unlock(&cgrp->event_list_lock);

9
mm/memcontrol.c
View File

@ -3361,12 +3361,6 @@ static int mem_cgroup_register_event(struct cgroup *cgrp, struct cftype *cft,
}
}
/*
* We need to increment refcnt to be sure that all thresholds
* will be unregistered before calling __mem_cgroup_free()
*/
mem_cgroup_get(memcg);
if (type == _MEM)
rcu_assign_pointer(memcg->thresholds, thresholds_new);
else
@ -3460,9 +3454,6 @@ assign:
/* To be sure that nobody uses thresholds before freeing it */
synchronize_rcu();
for (i = 0; i < thresholds->size - size; i++)
mem_cgroup_put(memcg);
kfree(thresholds);
unlock:
mutex_unlock(&memcg->thresholds_lock);