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    SubjectRe: [PATCH v14 4/4] cgroup: implement the PIDs subsystem
    On Wed, Jun 10, 2015 at 01:53:04PM +0900, Tejun Heo wrote:
    > On Tue, Jun 09, 2015 at 09:32:10PM +1000, Aleksa Sarai wrote:
    > > Adds a new single-purpose PIDs subsystem to limit the number of
    > > tasks that can be forked inside a cgroup. Essentially this is an
    > > implementation of RLIMIT_NPROC that applies to a cgroup rather than a
    > > process tree.
    > >
    > > However, it should be noted that organisational operations (adding and
    > > removing tasks from a PIDs hierarchy) will *not* be prevented. Rather,
    > > the number of tasks in the hierarchy cannot exceed the limit through
    > > forking. This is due to the fact that, in the unified hierarchy, attach
    > > cannot fail (and it is not possible for a task to overcome its PIDs
    > > cgroup policy limit by attaching to a child cgroup -- even if migrating
    > > mid-fork it must be able to fork in the parent first).
    > >
    > > PIDs are fundamentally a global resource, and it is possible to reach
    > > PID exhaustion inside a cgroup without hitting any reasonable kmemcg
    > > policy. Once you've hit PID exhaustion, you're only in a marginally
    > > better state than OOM. This subsystem allows PID exhaustion inside a
    > > cgroup to be prevented.
    >
    > Patches 3-4 look good to me. Will apply once v4.3 dev window opens.

    Applied 3-4 to cgroup/for-4.3.

    Thanks.

    --
    tejun


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