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    SubjectRe: [PATCH v4] vmevent: Implement greater-than attribute state and one-shot mode
    On 05/01/2012 09:18 AM, Anton Vorontsov wrote:
    > This patch implements a new event type, it will trigger whenever a
    > value becomes greater than user-specified threshold, it complements
    > the 'less-then' trigger type.
    >
    > Also, let's implement the one-shot mode for the events, when set,
    > userspace will only receive one notification per crossing the
    > boundaries.
    >
    > Now when both LT and GT are set on the same level, the event type
    > works as a cross event type: it triggers whenever a value crosses
    > the threshold from a lesser values side to a greater values side,
    > and vice versa.
    >
    > We use the event types in an userspace low-memory killer: we get a
    > notification when memory becomes low, so we start freeing memory by
    > killing unneeded processes, and we get notification when memory hits
    > the threshold from another side, so we know that we freed enough of
    > memory.

    How are these vmevents supposed to work with cgroups?

    What do we do when a cgroup nears its limit, and there
    is no more swap space available?

    What do we do when a cgroup nears its limit, and there
    is swap space available?

    It would be nice to be able to share the same code for
    embedded, desktop and server workloads...

    --
    All rights reversed


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