Re: syncing the disks when entering sleep

Rafael J. Wysocki
2010-01-27T00:51:03Z

On Tuesday 26 January 2010, Pavel Machek wrote:
>
> > > > > The ideal behavior would be:
> > > > >
> > > > > if(disk is spun up)
> > > > > then let the sync happen
> > > >
> > > > I'm not against that. Patch welcome. :-)
> > >
> > > I'd say such knob would be ugly.
> >
> > Define "ugly", please.
>
> Per-system property, which should better be
> per-program-that-requires-suspend. You request suspend without syncing
> (you want it quick, battery is 90%), then the battery runs low, and
> system daeomn requests s2ram, not realizing that someone disabled sync
> from under him.

I really prefer a per-system setting. The program that wants to sync anyway
can easily do that by itself.

> > > But maybe acceptable way would be echo mem-nosync > power, or maybe it can
> > > already be done using s2disk ioctl interface...?
> >
> > Nope.
>
> Nope what?
>
> AFAICT no new interface is needed. Just do SNAPSHOT_FREEZE, then
> _S2RAM then _UNFREEZE.

That's not quite straightforward and I wouldn't seriously suggest that to
anyone.

Rafael