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    SubjectRe: [mm] [PATCH 4/4] Memory cgroup hierarchy feature selector
    On Thu, 06 Nov 2008 12:26:29 +0530
    Balbir Singh <balbir@linux.vnet.ibm.com> wrote:

    > KAMEZAWA Hiroyuki wrote:
    > > On Sun, 02 Nov 2008 11:33:51 +0530
    > > Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
    > >
    > >> KAMEZAWA Hiroyuki wrote:
    > >>> On Sun, 02 Nov 2008 00:19:02 +0530
    > >>> Balbir Singh <balbir@linux.vnet.ibm.com> wrote:
    > >>>
    > >>>> Don't enable multiple hierarchy support by default. This patch introduces
    > >>>> a features element that can be set to enable the nested depth hierarchy
    > >>>> feature. This feature can only be enabled when there is just one cgroup
    > >>>> (the root cgroup).
    > >>>>
    > >>> Why the flag is for the whole system ?
    > >>> flag-per-subtree is of no use ?
    > >> Flag per subtree might not be useful, since we charge all the way up to root,
    > > Ah, what I said is "How about enabling/disabling hierarhcy support per subtree ?"
    > > Sorry for bad text.
    > >
    > > like this.
    > > - you can set hierarchy mode of a cgroup turned on/off when...
    > > * you don't have any tasks under it && it doesn't have any child cgroup.
    >
    > I see.. the presence of tasks don't matter, since the root cgroup will always
    > have tasks. Presence of child groups does matter.
    >
    yes. you're right.

    Thanks,
    -Kame



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