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    SubjectRe: [PATCH 0/2] Kexec jump: The first step to kexec base hibernation
    Date
    On Thursday, 12 July 2007 15:51, Mark Lord wrote:
    > Rafael J. Wysocki wrote:
    > > On Thursday, 12 July 2007 08:43, david@lang.hm wrote:
    > >> On Wed, 11 Jul 2007, Jeremy Fitzhardinge wrote:
    > >>
    > >>> Andrew Morton wrote:
    > ..
    > >> 8. hibernate kernel does syspend-to-ram to put the devices into a known
    > >> safe state.
    > > Again, the devices should be quiesced rather then suspended in this step.
    >
    > That's just not possible. The Hibernate kernel will not have all
    > of the same device drivers as the mainline kernel. Or at least that's
    > what people have previously stated here.

    OK, one more problem to solve. :-)

    > >>>> This sounds awesome. Am I correct in expecting that ultimately the
    > >>>> existing hibernation implementation just goes away and we reuse (and hence
    > >>>> strengthen) the existing kexec (and kdump?) infrastructure?
    >
    > No, not so simple. We still need much of the code to santize devices
    > upon wakeup from hibernation. And adding this extra reboot-kernel step
    > in the midst of hibernate will double the time it takes (ugh).
    >
    > Currently, TuxOnIce(suspend2) takes about 10 seconds to suspend my notebook.
    > Switching to this new scheme would double that to 10 seconds to boot/probe,
    > plus the original 10 seconds to hibernate. Assuming the new implementation
    > even comes close to suspend2 speed.

    How much RAM is there in your machine?

    Greetings,
    Rafael


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