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From: Blaisorblade <blaisorblade@yahoo.it>
To: Jeff Dike <jdike@addtoit.com>
Cc: user-mode-linux-devel@lists.sourceforge.net,
Andrew Morton <akpm@osdl.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [uml-devel] [PATCH] UML - fix I/O hang when multiple devices are in use
Date: Sat, 31 Mar 2007 16:17:08 +0200 [thread overview]
Message-ID: <200703311617.09082.blaisorblade@yahoo.it> (raw)
In-Reply-To: <20070329182920.GB8065@c2.user-mode-linux.org>
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
prev parent reply other threads:[~2007-03-31 14:17 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-28 2:02 Jeff Dike
2007-03-29 0:36 ` [uml-devel] " Blaisorblade
2007-03-29 1:02 ` Blaisorblade
2007-03-29 18:29 ` Jeff Dike
2007-03-30 11:53 ` Blaisorblade
2007-03-31 14:17 ` Blaisorblade [this message]
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