From: Li Zefan <lizefan@huawei.com>
To: Tejun Heo <tj@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Glauber Costa <glommer@parallels.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Michal Hocko <mhocko@suse.cz>,
Johannes Weiner <hannes@cmpxchg.org>,
LKML <linux-kernel@vger.kernel.org>,
Cgroups <cgroups@vger.kernel.org>, <linux-mm@kvack.org>
Subject: [PATCH v3 2/8] cgroup: document how cgroup IDs are assigned
Date: Mon, 29 Jul 2013 15:08:04 +0800 [thread overview]
Message-ID: <51F614D4.6000703@huawei.com> (raw)
In-Reply-To: <51F614B2.6010503@huawei.com>
As cgroup id has been used in netprio cgroup and will be used in memcg,
it's important to make it clear how a cgroup id is allocated.
For example, in netprio cgroup, the id is used as index of anarray.
Signed-off-by: Li Zefan <lizefan@huwei.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
---
include/linux/cgroup.h | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 2bd052d..8c107e9 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -161,7 +161,13 @@ struct cgroup_name {
struct cgroup {
unsigned long flags; /* "unsigned long" so bitops work */
- int id; /* idr allocated in-hierarchy ID */
+ /*
+ * idr allocated in-hierarchy ID.
+ *
+ * The ID of the root cgroup is always 0, and a new cgroup
+ * will be assigned with a smallest available ID.
+ */
+ int id;
/*
* We link our 'sibling' struct into our parent's 'children'.
--
1.8.0.2
next prev parent reply other threads:[~2013-07-29 7:09 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-29 7:07 [PATCH v3 0/8] memcg, cgroup: kill css_id Li Zefan
2013-07-29 7:07 ` [PATCH v3 1/8] cgroup: convert cgroup_ida to cgroup_idr Li Zefan
2013-07-29 18:28 ` Tejun Heo
2013-07-30 1:10 ` Li Zefan
2013-07-30 14:21 ` Tejun Heo
2013-07-29 7:08 ` Li Zefan [this message]
2013-07-29 18:26 ` [PATCH v3 2/8] cgroup: document how cgroup IDs are assigned Tejun Heo
2013-07-30 1:08 ` Li Zefan
2013-07-30 14:22 ` Tejun Heo
2013-07-29 7:08 ` [PATCH v3 3/8] cgroup: implement cgroup_from_id() Li Zefan
2013-07-29 18:31 ` Tejun Heo
2013-07-29 7:08 ` [PATCH v3 4/8] memcg: convert to use cgroup_is_descendant() Li Zefan
2013-07-29 7:08 ` [PATCH v3 5/8] memcg: convert to use cgroup id Li Zefan
2013-07-29 7:09 ` [PATCH v3 6/8] memcg: fail to create cgroup if the cgroup id is too big Li Zefan
2013-07-29 7:09 ` [PATCH v3 7/8] memcg: stop using css id Li Zefan
2013-07-29 7:10 ` [PATCH v3 8/8] cgroup: kill css_id Li Zefan
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