Freespacenotifier KDED module in kdereview

[Raphael Kubo da Costa]

On Tuesday 18 May 2010 08:23:35 Lubos Lunak wrote:
> On Monday 17 of May 2010, Lubos Lunak wrote:
> > On Monday 17 of May 2010, Jacopo De Simoi wrote:
> > > I've a question about this module, as far as I can understand it polls
> > > the disk on which $HOME is mounted every minute to check the available
> > > disk space. This is something we carefully avoided to do in the plasma
> > > device notifier because by doing so we keep the disks awake instead of
> > > letting them sleep if unused if the user desires so. This module would
> > > probably upset laptop users, am I right? (ervin?)
> >  
> >  Do you have some more details on this? I tried to keep my HDD spun down
> > 
> > after I had bought SSD and there was always something that kept spinning
> > it up, so eventually I've given up and I keep it unmounted until needed.
> > As far as I know laptops have a special mode for allowing them to spin
> > down the drive that does more aggressive caching and I don't understand
> > why free space, which is something very easy to cache, should keep the
> > actual drive active.
> 
>  I've asked the local filesystem expert and according to him I'm right -
> under normal circumstances at least for ext2-4, xfs and reiserfs statfs()
> means kernel just reads values from memory, thus no disk access. So unless
> somebody can prove otherwise I consider this a non-issue.

Do you know if the same applies to statvfs()? I've sent a patch to Ivo to 
replace the statfs() call with statvfs() in order to unbreak compilation on 
other Unix platforms.