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authorLi Zefan <lizf@cn.fujitsu.com>2010-03-10 15:22:12 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-03-12 15:52:36 -0800
commitb70cc5fdb445a6929a01e9c406593265b136c99d (patch)
tree7ca8ec384bd93de2ba516f045d9c8c5c77f5b84a /kernel
parent67523c48aa74d5637848edeccf285af1c60bf14a (diff)
cgroups: clean up cgroup_pidlist_find() a bit
Don't call get_pid_ns() before we locate/alloc the ns. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Serge Hallyn <serue@us.ibm.com> Acked-by: Paul Menage <menage@google.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/cgroup.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 521591dbab2..1bf4d6db54a 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -2597,7 +2597,8 @@ static struct cgroup_pidlist *cgroup_pidlist_find(struct cgroup *cgrp,
{
struct cgroup_pidlist *l;
/* don't need task_nsproxy() if we're looking at ourself */
- struct pid_namespace *ns = get_pid_ns(current->nsproxy->pid_ns);
+ struct pid_namespace *ns = current->nsproxy->pid_ns;
+
/*
* We can't drop the pidlist_mutex before taking the l->mutex in case
* the last ref-holder is trying to remove l from the list at the same
@@ -2607,8 +2608,6 @@ static struct cgroup_pidlist *cgroup_pidlist_find(struct cgroup *cgrp,
mutex_lock(&cgrp->pidlist_mutex);
list_for_each_entry(l, &cgrp->pidlists, links) {
if (l->key.type == type && l->key.ns == ns) {
- /* found a matching list - drop the extra refcount */
- put_pid_ns(ns);
/* make sure l doesn't vanish out from under us */
down_write(&l->mutex);
mutex_unlock(&cgrp->pidlist_mutex);
@@ -2619,13 +2618,12 @@ static struct cgroup_pidlist *cgroup_pidlist_find(struct cgroup *cgrp,
l = kmalloc(sizeof(struct cgroup_pidlist), GFP_KERNEL);
if (!l) {
mutex_unlock(&cgrp->pidlist_mutex);
- put_pid_ns(ns);
return l;
}
init_rwsem(&l->mutex);
down_write(&l->mutex);
l->key.type = type;
- l->key.ns = ns;
+ l->key.ns = get_pid_ns(ns);
l->use_count = 0; /* don't increment here */
l->list = NULL;
l->owner = cgrp;