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: <4DBEF8EC.7080301@zytor.com>
Date:	Mon, 02 May 2011 11:33:16 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	xen-devel@...ts.xensource.com, yinghai@...nel.org,
	linux-kernel@...r.kernel.org, stefano.stabellini@...citrix.com
Subject: Re: [Xen-devel] Re: [PATCH] Two patches fixing regression introduced
 by 'x86-64, mm: Put early page table high'

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.

	-hpa
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