Re: [PATCH] bdi: use deferable timer for sync_supers task

[Yong Wang]

On Fri, Oct 08, 2010 at 01:28:07PM +0300, Artem Bityutskiy wrote:
> On Fri, 2010-10-08 at 18:27 +0800, Wu, Xia wrote:
> > > However, when the next wake-up interrupt happens is not defined. It can
> > > happen 1ms after, or 1 minute after, or 1 hour after. What Christoph
> > > says is that there should be some guarantee that sb writeout starts,
> > > say, within 5 to 10 seconds interval. Deferrable timers do not guarantee
> > > this. But take a look at the range hrtimers - they do exactly this.
> > 
> > If the system is in sleep state, is there any data which should be written?
> 
> May be yes, may be no.
> 

Thanks for the quick response, Artem. May I know what might need to be
written out when system is really idle?

-Yong

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