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    SubjectRe: [PATCHv3 linux-next] hrtimer: Add notifier when clock_was_set was called
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    From: Thomas Gleixner <tglx@linutronix.de>
    Date: Thu, 12 Sep 2013 16:43:37 +0200 (CEST)

    > So what about going back to timer_list timers and simply utilize
    > register_pm_notifier(), which will tell you that the system resumed?

    The thing to understand is that there are two timeouts for an IPSEC
    rule, a soft and a hard timeout.

    There is a gap between these two exactly so that we can negotiate a
    new encapsulation with the IPSEC gateway before communication ceases
    to be possible over the IPSEC protected path.

    So the idea is that the soft timeout triggers the re-negotiation,
    and after a hard timeout the IPSEC path is no longer usable and
    all communication will fail.

    Simply triggering a re-negoation after every suspend/resume makes
    no sense at all. Spurious re-negotiations are undesirable.

    What we want are real timers. We want that rather than a "we
    suspended so just assume all timers expired" event which is not very
    useful for this kind of application.


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