[RFC, PATCH 0/3] serialise concurrent direct IO sub-block zeroing

[Alex Elder]

On Sat, 2010-07-24 at 10:09 +1000, Dave Chinner wrote:
> On Fri, Jul 23, 2010 at 02:20:07PM -0500, Eric Sandeen wrote:
> > Dave Chinner wrote:
> > > Patches for discussion seeing as git.kernel.org is being slow to update.
> > > 
> > 
> > I can confirm that this fixes the qemu problems, too.
> > 
> > Also makes the install take about 30min vs. 10 ;)
> 
> Yeah, that's no surprise - it'll be serialising all the IO even when
> it doesn't need to. Good to know that we've found the cause of the
> problem, though, so we can work from here towards a more robust
> solution.

The patchesmade test 240 in the xfstests suite pass when
it consistently did not for me without it.

However I found that test 104 hung the two times I tried it.
At first I thought it could have been just taking a long time
but the fsstress processes were unkillable and shutdown
didn't complete either.  I tried again after removing the
patches and 104 passed again.

					-Alex