Re: syncing the disks when entering sleep

Rafael J. Wysocki
2010-01-22T20:49:46Z

On Friday 22 January 2010, Leisner, Martin wrote:
> I noticed when we enter sleep states, it seems there's always a
> sys_sync given.
>
> When having an embedded system doing WOL (already in laptop mode to
> cache
> all the writes), it reasonable to wake up dozens of times of day and
> quickly go back to sleep. If the disk is not spun up,
> and there's some work to be done, won't the sys_sync spin up the disk
> before going to sleep?
>
> It would be good to have a knob (in /sys) you can tweak from usespace to
>
> configure the behavior of whether you want to do a sync when entering
> sleep.
>
> The ideal behavior would be:
>
> if(disk is spun up)
> then let the sync happen

I'm not against that. Patch welcome. :-)

Rafael