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    SubjectRe: [PATCH 0/9] OpenVZ kernel based checkpointing/restart
    Andrey Mirkin wrote:
    > This patchset introduces kernel based checkpointing/restart as it is
    > implemented in OpenVZ project. This patchset has limited functionality and
    > are able to checkpoint/restart only single process. Recently Oren Laaden
    > sent another kernel based implementation of checkpoint/restart. The main
    > differences between this patchset and Oren's patchset are:
    >
    > * In this patchset checkpointing initiated not from the process
    > (right now we do not have a container, only namespaces), Oren's patchset
    > performs checkpointing from the process context.
    >
    > * Restart in this patchset is initiated from process, which restarts a new
    > process (in new namespaces) with saved state. Oren's patchset uses the same
    > process from which restart was initiated and restore saved state over it.
    >
    > * Checkpoint/restart functionality in this patchset is implemented as a kernel
    > module

    why ? Do we really think that C/R implementations will be so different that
    we will need C/R ops to support all of them ? I imagine that there could be
    different models :

    1. brute force : dump it all and kill
    2. incremental
    3. live migration
    ...

    But I see all of them really tied to the kernel internals.

    The first issues I see with this direction are some EXPORT_SYMBOL() that would
    be useless without a module.

    > As checkpointing is initiated not from the process which state should be saved
    > we should freeze a process before saving its state. Right now Container Freezer
    > from Matt Helsley can be used for this.

    OK that's integrated and Daniel's tools :

    http://lxc.cvs.sourceforge.net/lxc/

    one more reason to work on integration :)

    C.


    > This patchset introduce only a concept how kernel based checkpointing/restart
    > can be implemented and are able to checkpoint/restart only a single process
    > with simple VMAs.
    >
    > I've tried to split my patchset in small patches to make review more easier.
    > _______________________________________________
    > Containers mailing list
    > Containers@lists.linux-foundation.org
    > https://lists.linux-foundation.org/mailman/listinfo/containers
    >



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