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    SubjectRe: [patch00/05]: Containers(V2)- Introduction
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    On Wed, 2006-09-20 at 11:14 -0700, Rohit Seth wrote:
    > On Wed, 2006-09-20 at 20:06 +0200, Peter Zijlstra wrote:
    > > On Wed, 2006-09-20 at 10:52 -0700, Christoph Lameter wrote:
    > > > On Wed, 20 Sep 2006, Rohit Seth wrote:
    > > >
    > > > > Right now the memory handler in this container subsystem is written in
    > > > > such a way that when existing kernel reclaimer kicks in, it will first
    > > > > operate on those (container with pages over the limit) pages first. But
    > > > > in general I like the notion of containerizing the whole reclaim code.
    > > >
    > > > Which comes naturally with cpusets.
    > >
    > > How are shared mappings dealt with, are pages charged to the set that
    > > first faults them in?
    > >
    >
    > For anonymous pages (simpler case), they get charged to the faulting
    > task's container.
    >
    > For filesystem pages (could be shared across tasks running different
    > containers): Every time a new file mapping is created, it is bound to a
    > container of the process creating that mapping. All subsequent pages
    > belonging to this mapping will belong to this container, irrespective of
    > different tasks running in different containers accessing these pages.
    > Currently, I've not implemented a mechanism to allow a file to be
    > specifically moved into or out of container. But when that gets
    > implemented then all pages belonging to a mapping will also move out of
    > container (or into a new container).

    Yes, I read that in your patches, I was wondering how the cpuset
    approach would handle this.

    Neither are really satisfactory for shared mappings.

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