Re: [PATCH] cgroup: fix to allow mounting a hierarchy by name

From: Li Zefan
Date: Wed Dec 28 2011 - 21:48:17 EST

Tejun Heo wrote:
> Hello, Li.
> On Wed, Dec 28, 2011 at 02:10:42PM +0800, Li Zefan wrote:
>> The "name" option was introduced along with the "none" option, so we
>> can distinguish between different cgroup hierarchies which have no
>> bound subsystems, like this:
>> # mount -t cgroup -o none,name=hier1 xxx /cgroup1
>> # mount -t cgroup -o none,name=hier2 xxx /cgroup2
>> As the name is unique, we have this "mount by hierarchy name" feature.
> I could be missing something but does that add anything other than
> naming convenience?

The name option is necessary, otherwise how can we mount hierarchies
as shown in the above example?

>> It looks reasonable, but I guess few people know this feature. We can
>> live with it, as it only saves us some typing when mounting an existing
>> hierarchy. On the other hand, removing this small feature can hardly
>> result in code reduction.
> If it's a redundant feature which has been broken over a year without
> anyone complaining, it really doesn't need to exist. It might not
> save a lot of code but would save some WTH moments.

The redundant feature is mouting existing hierarchies by specifying name
only, and the cleanup patch I sent has this feature removed in effect.

kernel/cgroup.c | 15 +++++++--------
1 files changed, 7 insertions(+), 8 deletions(-)

This is why I'm not so keen to remove the feature.
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