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    SubjectRe: Back to the future.

    On Thu, 2007-04-26 at 11:17 +0300, Pekka Enberg wrote:
    > Hi Nigel,
    > On 4/26/07, Nigel Cunningham <> wrote:
    > > * Doing things in the right order? (Prepare the image, then do the
    > > atomic copy, then save).
    > As I am a total newbie to the power management code, I am unable to
    > spot the conceptual difference in uswsusp suspend.c:suspend_system()
    > and suspend2 kernel/power/suspend.c:suspend_main(). How are they
    > different?

    Will discuss in irc since you've appeared there...

    > On 4/26/07, Nigel Cunningham <> wrote:
    > > * Mulithreaded I/O (might as well use multiple cores to compress the
    > > image, now that we're hotplugging later).
    > I assume this doesn't affect the kernel at all with uswsusp?

    Well uswsusp would benefit from using multiple threads - if it can - to
    do the work. I saw quite an improvement from implementing it.

    > On 4/26/07, Nigel Cunningham <> wrote:
    > > * Modular design?
    > This is too broad. Please be more specific of the problems the current
    > suspend and snapshot/shutdown code in the kernel has.

    Did you see the 'Reasons to merge' email I sent? It has more detail on

    > Now to add to your list, as far as I can tell, suspend2 provides
    > better feedback to the user via the netlink mechanism (although the
    > kernel shouldn't be sending messages such as userui_redraw but instead
    > let the userspace know of the actual events, for example, that tasks
    > have now been frozen). However, I am unsure if this is still relevant
    > as most of the work (snapshot writing) is being done in userspace
    > where we explicitly know when processes have been frozen, when the
    > snapshot is finished, and when it's written to disk.

    From uswsusp's point of view, yeah. But I'm still coming from the 'doing
    this in kernelspace makes far more sense' perspective.


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