linux-kernel - Re: [Xen-devel] Re: [PATCH] Two patches fixing regression introduced by 'x86-64, mm: Put early page table high'

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Message-ID: <20110502193436.GA14666@dumpdata.com>
Date:	Mon, 2 May 2011 15:34:36 -0400
From:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:	"H. Peter Anvin" <hpa@...or.com>, yinghai@...nel.org,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org
Subject: Re: [Xen-devel] Re: [PATCH] Two patches fixing regression introduced
 by 'x86-64, mm: Put early page table high'

On Mon, May 02, 2011 at 11:33:16AM -0700, H. Peter Anvin wrote:
> On 05/02/2011 11:08 AM, Konrad Rzeszutek Wilk wrote:
> >>
> >> My inclination would be to apply your workaround -- are there any
> >> adverse effects to doing that?
> > 
> > There is a bootup slowdown (not noticeable). That is because we call the
> > 'memblock_find_range' function on every PTE table creation (only during
> > bootup of course). 
> > 
> > Testing wise, on the machines on which the regression occurred, with these two
> > patches the regression disappears - so that is a good sign. I am testing
> > it on some more today to assure myself I am not missing anything.
> > 
> 
> OK, sounds like a plan then.  I like it because it doesn't affect the
> native kernel.

<laughs> I figured :-)

Moving forward I really want to get rid of this wart.

Not sure if it is possible, but I was thinking it would be nice to get
you, Yinghai, Jeremy, Stefano all in one place (phone or web-conference thing)
to sketch out some ideas and hammer something out.

What days would work best?
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