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    SubjectRe: [PATCH 7/7] cgroups: Update documentation for bindable subsystems
    On Fri, 22 Oct 2010 16:12:25 +0800
    Li Zefan <lizf@cn.fujitsu.com> wrote:

    > Provide a usage example, and update the bind() callback API.
    >
    > Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
    > ---
    > Documentation/cgroups/cgroups.txt | 26 +++++++++++++++++---------
    > 1 files changed, 17 insertions(+), 9 deletions(-)
    >
    > diff --git a/Documentation/cgroups/cgroups.txt b/Documentation/cgroups/cgroups.txt
    > index 190018b..5b5382a 100644
    > --- a/Documentation/cgroups/cgroups.txt
    > +++ b/Documentation/cgroups/cgroups.txt
    > @@ -363,17 +363,23 @@ Note this will add ns to the hierarchy but won't remove memory or
    > cpuset, because the new options are appended to the old ones:
    > # mount -o remount,ns /dev/cgroup
    >
    > +For some subsystems you can bind them to a mounted hierarchy or
    > +remove them from it, even if there're sub-cgroups in it:
    > +# mount -t cgroup -o freezer hier1 /dev/cgroup
    > +# echo $$ > /dev/cgroup/my_cgroup
    > +# mount -o freezer,cpuset hier1 /dev/cgroup
    > +(failed)
    > +# mount -o freezer,cpuacct hier1 /dev/cgroup
    > +# mount -o cpuacct hier1 /dev/cgroup
    > +
    > +Note cpuacct should be sit in the default hierarchy before remount.
    > +

    Can this operation be used with noop cgroup ?
    (IOW, perf cgroup can be attached to noop cgroup ?)

    Thanks,
    -Kame



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