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    SubjectRe: [PATCH 1/2] cgroup allow subsys to set default mode of its own file
    On Thu, Feb 26, 2009 at 1:00 PM, Andrew Morton
    <> wrote:
    > On Wed, 25 Feb 2009 16:35:55 +0900
    > KAMEZAWA Hiroyuki <> wrote:
    >> When I wrote tools for maintain cgroup, I can't find which file is
    >> writable intarfece or not via cgroup file systems. (finally, I did
    >> dirty approach.)
    >> IMHO, showing "this file is read-only" in explicit way is useful
    >> for user-land (tools). In other story, a file whose name sounds read-only
    >> may have "trigger" operation and support reseting. In this case,
    >> "writable" is informative.
    > Well, we have compatibility issues here. If we make this change, and
    > people write tools which depend upon that change then those tools might
    > break when run upon older kernels.

    I don't think that's too big a deal - a write can always fail at the
    whim of a cgroups subsystem, so this would just be a hint to a tool
    that it shouldn't even bother trying to write to the file. It should
    be able to handle a failure.

    But I don't see why we can't figure out the mode automatically based
    on whether or not there's a write handler defined for the control


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