linux-kernel - Re: [uml-devel] [PATCH] UML - fix I/O hang when multiple devices are in use

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Date:	Sat, 31 Mar 2007 16:17:08 +0200
From:	Blaisorblade <blaisorblade@...oo.it>
To:	Jeff Dike <jdike@...toit.com>
Cc:	user-mode-linux-devel@...ts.sourceforge.net,
	Andrew Morton <akpm@...l.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [uml-devel] [PATCH] UML - fix I/O hang when multiple devices are in use

On giovedì 29 marzo 2007, Jeff Dike wrote:
> On Thu, Mar 29, 2007 at 02:36:43AM +0200, Blaisorblade wrote:
> > > Sometimes you need to. I'd probably just remove the do_ubd check and
> > > always recall the request function when handling completions, it's
> > > easier and safe.
>
> If I'm understanding this correctly, this is what happens now.  There
> is still the flag check and return if the queue is being run, but I
> don't see the advantage of removing that.
Possibly he just didn't understood what do_ubd was for, maybe there's some 
technical reason.

> That's a lot of mapping and unmapping though.  I wonder if just
> calling mmap would cause the COWed page to be dropped...
Yes, it would.
-- 
Inform me of my mistakes, so I can add them to my list!
Paolo Giarrusso, aka Blaisorblade
http://www.user-mode-linux.org/~blaisorblade
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