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Re: [Xen-devel] Re: [PATCH] Two patches fixing regression introduced by

To: "H. Peter Anvin" <hpa@xxxxxxxxx>, yinghai@xxxxxxxxxx, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Subject: Re: [Xen-devel] Re: [PATCH] Two patches fixing regression introduced by 'x86-64, mm: Put early page table high'
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Mon, 2 May 2011 15:34:36 -0400
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
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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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