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    SubjectRe: [RFC][PATCH 00/11] blkiocg async support
    On Wed, 14 Jul 2010 10:29:19 -0400
    Vivek Goyal <> wrote:
    > >
    > > Cgroup's feature as mounting several subsystems at a mount point at once
    > > is very useful in many case.
    > I agree that it is useful but if some controllers are not supporting
    > hierarchy, it just adds to more confusion. And later when hierarchy
    > support comes in, there will be additional issue of keeping this file
    > "use_hierarchy" like memory controller.
    > So at this point of time , I am not too inclined towards allowing hierarchical
    > cgroup creation but treating them as flat in CFQ. I think it adds to the
    > confusion and user space should handle this situation.


    Could you fix error code in create blkio cgroup ? It returns -EINVAL now.
    IIUC, mkdir(2) doesn't return -EINVAL as error code (from man.)
    Then, it's very confusing. I think -EPERM or -ENOMEM will be much better.

    Anyway, I need to see source code of blk-cgroup.c to know why libvirt fails
    to create cgroup. Where is the user-visible information (in RHEL or Fedora)
    about "you can't use blkio-cgroup via libvirt or libcgroup" ?


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