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    SubjectRe: [PATCH -mm 1/2] kexec jump -v12: kexec jump
    On Sat 2008-07-12 11:02:17, Nigel Cunningham wrote:
    > Hi.
    >
    > On Fri, 2008-07-11 at 16:11 -0400, Vivek Goyal wrote:
    > > Hi Andrew,
    > >
    > > We can use this patchset for hibernation, but can it be a better way of doing
    > > things than what we already have, I don't know. Last time I had raised
    > > this question and power people had various views. In the end, Pavel wanted
    > > this patchset to be in. Pavel, can tell more here...
    > >
    > > To me this patchset looks interesting for couple of reasons.
    > >
    > > - Looks like an interesting feature where one can have a separate kernel
    > > in memory and one can switch between the kernels on the fly. It can
    > > be modified to have more than one kernel in memory at a time.
    >
    > I'm not sure how useful that would be, though. I already have
    > functionality in TuxOnIce which allows you to resume a different image
    > instead of powering off (roughly the same thing when combined with not
    > removing the image after resuming). It was neat when testing to be
    > able

    Beaty of kjump is that it is supposed to used on half-broken system,
    so it is useful for debugging.

    > > - So far kexec was one directional. One can only kexec to new kernel and
    > > old kernel was gone. Now this patchset makes kexec functionality kind
    > > of bidirectional and this looks like logical extension and can lead
    > > to intersting use cases in future.
    >
    > Ah. You mean keeping both kernels in memory at the same time? In the
    > above, I was replacing one image with another.

    Yep, kjump keeps both kernels loaded at the same time.
    Pavel
    --
    (english) http://www.livejournal.com/~pavelmachek
    (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html


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