Re: ext3 IO latency measurements (was: Linux 2.6.29)

Matthew Garrett
2009-03-26T20:56:24Z

On Thu, Mar 26, 2009 at 08:42:09PM +0000, Alan Cox wrote:
> > before performing the update. So while relatime doesn't conform, the
> > practical difference is meaningless. You can't depend on atime being
> > updated in a timely manner.
>
> POSIX says a disk write interrupted by a signal can be a short write. If
> you do this in practice all hell breaks loose.
>
> A conforming implementation needs to conform with expectations not just
> play lawyer games with users systems.

I agree, but arguing for something on the basis of a spec isn't terribly
convincing if the spec allows effectively identical behaviour. SuS isn't
a relevant consideration when it comes to deciding default atime policy.

--
Matthew Garrett | mjg59@srcf.ucam.org