Re: getnstimeofday() and suspend

[Tony Lindgren <tony@atomide.com>]

* Tero.Kristo@nokia.com <Tero.Kristo@nokia.com> [080813 15:59]:
> Hi,
> 
> I noticed an interesting feature in the getnstimeofday() function when
> used with suspend. System clock is effectively reset to the value it was
> just before suspend. You can see this behavior e.g. with this command
> line:
> 
> 	date && echo mem > /sys/power/state && date
> 
> With approx. 2 minutes in suspend state the output for me was this:
> 
> / # date && echo mem > sys/power/state && date
> Thu Jan  1 00:13:40 UTC 1970PM: Syncing filesystems ...
> done.
> Freezing user space processes ... (elapsed 0.00 seconds) done.
> Freezing remaining freezable tasks ... (elapsed 0.00 seconds) done.
> Suspending console(s)
> Successfully put all powerdomains to target state
> Restarting tasks ... done.
> Thu Jan  1 00:13:42 UTC 1970
> 
> I.e., the calendar clock was only advanced 2 seconds. The time you spend
> in suspend does not matter, the end result is the same, it will reset
> the time to the value it was before suspend.
> 
> Is this behavior intended?

Hmm, well it should get the value straight from the 32KiHZ sync timer.
Does that get stopped somehow during suspend?

Tony