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    SubjectRe: [PATCH 10/30] cr: core stuff
    Quoting Oren Laadan (
    > Hi,
    > Serge E. Hallyn wrote:
    > > Quoting Alexey Dobriyan (
    > >
    > > Hi Alexey,
    > >
    > > as far as I can see, the main differences between this patch and the
    > > equivalent in Oren's tree are:
    > >
    > > 1. kernel auto-selects container init to freeze
    > Actually, this eliminates the possibility to checkpoint a subtree of
    > tasks, which (under some obvious constraints) can be a handy feature.

    Yes, I agree. As Dave pointed out on irc yesterday, this patch shows a
    very definate whole-container-only point of view which is worth

    > > 2. kernel freezes tasks
    > IMHO better to do it in userspace - that way userspace can accomplish
    > other tasks while tasks are frozen, such as snapshot the filesystem,
    > or block/unblock the network.

    That's a good point.

    > Is there a good argument to do it kernel ?

    Convenience? I guess you don't have to worry about getting your
    checkpoint job into a cgroup by itself ahead of time.

    > > 3. no objhash taking references
    > > 4. no hbuf
    > > 5. always require CAP_SYS_ADMIN
    > I'm now convinced (thanks, Serge!) that it's better not to require
    > this unless we strictly have to.

    :) Cool.

    I think the perceived need for it comes, as above, from the pure
    checkpoint-a-whole-container-only view. So long as you will
    checkpoint/restore a whole container, then you'll end up doing
    something requiring privilege anyway. But that is not all of
    the use cases.


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