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    SubjectRe: [PATCH 0/3 -mm] kexec jump -v8
    On Fri, 2007-12-21 at 19:35 +1100, Nigel Cunningham wrote:
    > Hi.
    > Huang, Ying wrote:
    > > This patchset provides an enhancement to kexec/kdump. It implements
    > > the following features:
    > >
    > > - Backup/restore memory used both by the original kernel and the
    > > kexeced kernel.
    > Why the kexeced kernel as well?

    The memory range used by kexeced kernel is also the usable memory range
    in original kernel. Maybe should be: backup/restore memory used by both
    the original kernel and the kexeced kernel. My English is poor.

    > [...]
    > > The features of this patchset can be used as follow:
    > >
    > > - Kernel/system debug through making system snapshot. You can make
    > > system snapshot, jump back, do some thing and make another system
    > > snapshot.
    > Are you somehow recording all the filesystem changes after the first
    > snapshot? If not, this is pointless (you'll end up with filesystem
    > corruption).

    This snapshot is not used for restore/resume. It is just used for
    debugging. You can check the system state with these snapshots. So I
    think it is useful even without recording filesystem changes.

    > [...]
    > > - Cooperative multi-kernel/system. With kexec jump, you can switch
    > > between several kernels/systems quickly without boot process except
    > > the first time. This appears like swap a whole kernel/system out/in.
    > How is this useful to the end user?

    I am not sure how useful is this. Maybe I can run a Redhat and a Debian
    on my machine and switch between them.

    Best Regards,
    Huang Ying

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