Hi. Rafael J. Wysocki wrote: > 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. :-) Oooh. I am. That's providing potential for unpredictable behaviour. Much better IMO would be providing a tuning know that explicitly and unconditionally disables syncing. Regards, Nigel _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
