Re: [BK][PATCH] Reiser4, will double Linux FS performance, pleaseapply

[reiser <reiser@namesys.com>]

Alexander Zarochentcev wrote:

>reiser writes:
> > Alexander Zarochentcev wrote:
> > 
> > > > >
> > > > >In reiser4 allocation of disk space is delayed to transaction commit. It
> > > > >is not possible to estimate precisely amount of disk space that will be
> > > > >allocated during commit, and hence statfs(2) results are not updated
> > > > >until one does sync(2) (forcing commit) or transaction is committed due
> > > > >to age (10 minutes by default).
> > > > >
> > > > >  
> > > > >
> > > > The above is badly phrased, and the behavior complained of is indeed a 
> > > > bug not a feature.  Please fix.  
> > > > 
> > > > statfs should be updated immediately in accordance with estimates used 
> > > > by the space reservation code, and then adjusted at commit time in 
> > > > accordance with actual usage.
> > >
> > >We should not do that unless we implement forcing of commits at out of free
> > >space situation.
> > >
> > I thought we had agreed to do forcing of commits at out of free space 
> > quite some time ago?  In any event, we should do forcing of commits at 
> > out of free space.  Yes?
>
>we will control this by a block allocator flag, we set it when we can close
>current transaction. I think for most cases it will be set.
> 
>
>  
>
ok