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    SubjectRe: [patch-final] Re: patch] cpusets, cgroups: disallow attaching kthreadd
    On Tue, 6 Dec 2011 12:13:10 -0800 (PST)
    David Rientjes <rientjes@google.com> wrote:

    > On Thu, 10 Nov 2011, David Rientjes wrote:
    >
    > > On Wed, 26 Oct 2011, David Rientjes wrote:
    > >
    > > > On Wed, 19 Oct 2011, Mike Galbraith wrote:
    > > >
    > > > > cpusets, cgroups: disallow attaching kthreadd
    > > > >
    > > > > Allowing kthreadd to be moved to a non-root group makes no sense, it being
    > > > > a global resource, and needlessly leads unsuspecting users toward trouble.
    > > > >
    > > > > 1. An RT workqueue worker thread spawned in a task group with no rt_runtime
    > > > > allocated is not schedulable. Simple user error, but harmful to the box.
    > > > >
    > > > > 2. A worker thread which acquires PF_THREAD_BOUND can never leave a cpuset,
    > > > > rendering the cpuset immortal.
    > > > >
    > > > > Save the user some unexpected trouble, just say no.
    > > > >
    > > > > Signed-off-by: Mike Galbraith <efault@gmx.de>
    > > > > Acked-by: David Rientjes <rientjes@google.com>
    > > > > Acked-by: Paul Menage <paul@paulmenage.org>
    > > > >
    > > >
    > > > Let's add Andrew to the cc so we can get it in -mm, I haven't seen it hit
    > > > linux-next yet.
    > > >
    > >
    > > Ping? Still missing from -mm and linux-next.
    > >
    >
    > Ping #2?
    >

    Why am I being pinged about scheduler patches? My sole contribution
    to this one is to point out that "its"->possessive and "it's"->"it is".

    Also, Peter has said

    : I really think that if we want to restrain userspace from doing
    : something stupid we might as well do something that makes sense, and
    : that is mandate kthreadd stays in the root group at all times for
    : everybody.

    which appears to be what the patch already did, so I'm confused again.

    It's time for a fresh resend, IMO.


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