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    SubjectRe: Linux Checkpoint-Restart - v19


    Andrew Morton wrote:
    > On Mon, 22 Feb 2010 18:17:00 -0500
    > Oren Laadan <orenl@cs.columbia.edu> wrote:
    >
    >> Hi Andrew,
    >>
    >> We've put a stake in the ground for our next set of checkpoint/restart
    >> patches, v19. It has some great new stuff, and we put extra effort to
    >> address your concerns. We would like to have the code included in -mm
    >> for wider feedback and testing.
    >>
    >> This one is able to checkpoint/restart screen and vnc sessions, and
    >> live-migrate network servers between hosts. It also adds support for
    >> x86-64 (in addition to x86-32, s390x and powerpc). It is rebased to
    >> kernel 2.6.33-rc8.
    >>
    >> Since one of your main concerns was about what is not yet implemented
    >> and how complicated or ugly it will be to support that, we've put up
    >> a wiki page to address that. In it there is a simple table that lists
    >> what is not implemented and the anticipated solution impact, and for
    >> some entries a link to more details.
    >>
    >> The page is here: http://ckpt.wiki.kernel.org/index.php/Checklist
    >
    > Does "Refuses to Checkpoint" mean that an attempt to checkpoint will
    > fail, return the failure to userspace and the system continues as
    > before?

    Yes.

    Also, there is a mechanism in place to report the reason for the
    failure (e.g. the offending resource) to the user.

    >
    >> We want to stress that the patchset is already very useful as-is. We
    >> will keep working to implement more features cleanly. Some features we
    >> are working on include network namespaces and device configurations,
    >> mounts and mounts namespaces, and file locks. Should a complicated
    >> feature prove hard to implement, users have alternatives systems like
    >> kvm, until we manage to come up with a clean solution.
    >>
    >> We believe that maintenance is best addressed through testing. We now
    >> have a comprehensive test-suite to automatically find regressions.
    >> In addition, we ran LTP and the results are the same with CHECKPOINT=n
    >> and =y.
    >>
    >> If desired we'll send the whole patchset to lkml, but the git trees
    >> can be seen at:
    >>
    >> kernel: http://www.linux-cr.org/git/?p=linux-cr.git;a=summary
    >> user tools: http://www.linux-cr.org/git/?p=user-cr.git;a=summary
    >> tests suite: http://www.linux-cr.org/git/?p=tests-cr.git;a=summary
    >>
    >
    > I'd suggest waiting until very shortly after 2.6.34-rc1 then please
    > send all the patches onto the list and let's get to work.
    >

    Sounds good -- will do.

    Thanks,

    Oren.


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