Messages in this thread | | | Date | Fri, 13 Sep 2013 16:32:24 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCHv3 linux-next] hrtimer: Add notifier when clock_was_set was called |
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On Fri, 13 Sep 2013, Fan Du wrote: > (2) What I have been bugging you around here for this long time is really the > second > problem, I'm sorry I didn't make it clearly to you and others, which is > below: > > Why using wall clock time to calculate soft/hard IPsec events when > xfrm_state timer > out happens in its timeout handler? Because even if xfrm_state using > CLOCK_BOOTTIME, > system wall clock time changing will surely disturb soft/hard IPsec > events, which > you raised your concern about in (*a*).
No CLOCK_BOOTTIME is not affected by wall clock time changes. It's basically CLOCK_MONOTONIC, it just keeps counting the suspend time as well. So without a suspend/resume cycle CLOCK_MONOTONIC and CLOCK_BOOTTIME are the same. After a suspend/resume cycle CLOCK_BOOTTIME will be N seconds ahead of CLOCK_MONOTONIC, where N is the number of seconds spent in suspend.
Thanks,
tglx
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