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    SubjectRe: [PATCH 0/4] ksm - dynamic page sharing driver for linux v2
    On Sunday 05 April 2009 01:35:18 Izik Eidus wrote:

    > This driver is very useful for KVM as in cases of runing multiple guests
    > operation system of the same type.
    > (For desktop work loads we have achived more than x2 memory overcommit
    > (more like x3))

    Interesting that it is a desirable workload to have multiple guests each
    running MS office.

    I wonder, can windows enter a paravirtualised guest mode for KVM? And can
    you detect page allocation/freeing events?

    > This driver have found users other than KVM, for example CERN,
    > Fons Rademakers:
    > "on many-core machines we run one large detector simulation program per core.
    > These simulation programs are identical but run each in their own process and
    > need about 2 - 2.5 GB RAM.
    > We typically buy machines with 2GB RAM per core and so have a problem to run
    > one of these programs per core.
    > Of the 2 - 2.5 GB about 700MB is identical data in the form of magnetic field
    > maps, detector geometry, etc.
    > Currently people have been trying to start one program, initialize the geometry
    > and field maps and then fork it N times, to have the data shared.
    > With KSM this would be done automatically by the system so it sounded extremely
    > attractive when Andrea presented it."

    They should use a shared memory segment, or MAP_ANONYMOUS|MAP_SHARED etc.
    Presumably they will probably want to control it to interleave it over
    all numa nodes and use hugepages for it. It would be very little work.

    > I am sending another seires of patchs for kvm kernel and kvm-userspace
    > that would allow users of kvm to test ksm with it.
    > The kvm patchs would apply to Avi git tree.

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