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Message-ID: <51F614D4.6000703@huawei.com>
Date: Mon, 29 Jul 2013 15:08:04 +0800
From: Li Zefan <lizefan@...wei.com>
To: Tejun Heo <tj@...nel.org>
CC: Andrew Morton <akpm@...ux-foundation.org>,
Glauber Costa <glommer@...allels.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
Michal Hocko <mhocko@...e.cz>,
Johannes Weiner <hannes@...xchg.org>,
LKML <linux-kernel@...r.kernel.org>,
Cgroups <cgroups@...r.kernel.org>, <linux-mm@...ck.org>
Subject: [PATCH v3 2/8] cgroup: document how cgroup IDs are assigned
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@...ei.com>
Reviewed-by: Michal Hocko <mhocko@...e.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
--
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