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    SubjectRe: TSC not updating after resume: Bug or Feature?
    Date
    On Thursday, 18 of December 2008, Dave Kleikamp wrote:
    > On Thu, 2008-12-18 at 23:19 +0100, Rafael J. Wysocki wrote:
    > > On Thursday, 18 of December 2008, Ingo Molnar wrote:
    > > >
    > > > * Peter Zijlstra <peterz@infradead.org> wrote:
    > > >
    > > > > Rafael, would something like this explain why we had to revert Shaggy's
    > > > > patch?
    > >
    > > Well, I have yet to understand what the suspend-resume of the timekeeping code
    > > actually does.
    > >
    > > The original description sounds worrisome to me, it looks like we've overlooked
    > > something at least.
    > >
    > > > > His patch fixes the backward motion filter and I'm at an utter
    > > > > loss why that would break suspend.
    > > >
    > > > yes, i'd love to have this commit reinstated:
    > > >
    > > > 5b7dba4: sched_clock: prevent scd->clock from moving backwards
    > > >
    > > > and the bug triggered by hibernation fixed instead.
    > >
    > > Shaggy said he had an idea of what was wrong, so I expect an updated version
    > > of the patch to appear.
    >
    > Not really. I said I'd look at it, but all I know is that it looks like
    > something clock-related isn't initialized correctly after resume. I
    > don't know enough to have any idea how to fix it.

    Well, thanks for the update.

    I'm going to have a look at the thing tomorrow, but I'm not sure I'll be able
    to fix it.

    Thanks,
    Rafael


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