Re: 2.6.20-rc6-mm3

[David Chinner]

On Wed, Jan 31, 2007 at 04:36:38PM -0800, Andrew Morton wrote:
> On Wed, 31 Jan 2007 16:27:16 -0800 (PST)
> Christoph Lameter <clameter@xxxxxxx> wrote:
> 
> > On Wed, 31 Jan 2007, Andrew Morton wrote:
> > 
> > > ow.  Please don't make me drop git-block-and-lots-of-other-things again.
> > > Was 2.6.20-rc6-mm2 OK?  It didn't have git-block.
> > 
> > Yes, 2.6.20-rc6-mm2 was okay. Sorry.
> 
> OK, thanks.
> 
> Actually, we might not have lost an IO: it could be that we're simply
> missing an unplug.

Could be - I can't be certain but I think we've got one thread
waiting for a buffer to be unpinned before it is written, and
the other thread waiting for log I/O to complete. The first thread
won't unplug the device, and the log I/o is async so it won't either.

What are the new unplugging rules introduced by the git-block
patch? How do they differ from the existing rules?

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
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