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    SubjectRe: [PATCHSET] cgroup: cftype based file interface, take #2
    Hey, Li.

    On Fri, Mar 30, 2012 at 08:42:07PM +0800, Li Zefan wrote:
    > > This patch replaces cgroup file interface with cftype based one which
    > > allows dynamic additions and removals of cftype arrays whether the
    > > target subsystem is attached or not. This can be used to make subsys
    > > rebinding via remount work properly but I intentionally avoided doing
    > > that at the moment.
    >
    > What's the problem with remount?

    Subsys can't be changed if any non-root cgroup exists.

    > and is it important enough that it should be fixed even the feature
    > is marked as deprecated?

    I'm not sure. We *might* need it during multi-mount -> single-mount
    transition depending on how that's implemented, so the "at the moment"
    qualifier. It probably won't be fixed but I'm not fully sure.

    > > This makes cgroup population simpler for controllers and will be used
    > > to allow controllers to be more dynamic. e.g. blkio subsys has
    > > sub-policies which may come and go while blkio subsys is attached and
    > > it currently uses fixed set of files which stays blank if not in use.
    >
    > Dynamic cgroup files was mentioned before. The scenario in mind was blkio
    > control files can be added/removed automatically as devices come and ago.
    >
    > So this time blkio subsystem is really going to be made more dynamic
    > soon?

    Patchset already posted.

    http://thread.gmane.org/gmane.linux.kernel.cgroups/1376

    Thanks.

    --
    tejun


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