linux-kernel - Re: [PATCH] vmap: add flag to allow lazy unmap to be disabled at runtime

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Message-ID: <20100727181349.GA15674@phenom.dumpdata.com>
Date:	Tue, 27 Jul 2010 14:13:49 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] vmap: add flag to allow lazy unmap to be disabled at
 runtime

On Tue, Jul 27, 2010 at 06:24:39PM +1000, Nick Piggin wrote:
> On Mon, Jul 26, 2010 at 01:24:51PM -0700, Jeremy Fitzhardinge wrote:
> > 
> > 
> > [ Nick, I forget if I sent this to you before.  Could you Ack it if it looks OK? Thanks, J ]
> > 
> > Add a flag to force lazy_max_pages() to zero to prevent any outstanding
> > mapped pages.  We'll need this for Xen.
> 
> You have sent this to me before, probably several times, and I always
> forget about it right as you send it again.
> 
> It's no problem merging something like this for Xen, although as you
> know I would love to see an approach where Xen would benefit from
> delayed flushing as well :)

Hey Nick,

So I've posted the patch with your Ack, in this thread
http://lkml.org/lkml/2010/7/27/246. I hope that is OK?

I think that using the delayed flushing is appropiate long-term.
I don't know that much about it but I will put it on the list of todo.
Fortunatly that list is actually shrinking (amazing!).
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