Re: laptop mode for 2.4.23-pre4 and up

[Jens Axboe]

On Wed, Sep 17 2003, Pavel Machek wrote:
> Hi!
> 
> > +So what does the laptop mode patch do? It attempts to fully utilize the
> > +hard drive once it has been spun up, flushing the old dirty data out to
> > +disk. Instead of flushing just the expired data, it will clean everything.
> > +When a read causes the disk to spin up, we kick off this flushing after
> > +a few seconds. This means that once the disk spins down again, everything
> > +is up to date. That allows longer dirty data and journal expire times.
> 
> Another nice touch would be to sync just before spinning down.
> noflushd does that... of course it needs software-controlled
> spindowns.

Yeah, my automatic acoustic management patch did that, works well in
addition to laptop mode. It's beyond the scope of this patch though,
it's just a vm flushing control.

-- 
Jens Axboe

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