linux-kernel - Re: [Xen-devel] [PATCH]: Fix Xen domU boot with batched mprotect

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Message-Id: <48F70941.76E4.0078.0@novell.com>
Date:	Thu, 16 Oct 2008 08:28:33 +0100
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	"Jeremy Fitzhardinge" <jeremy@...p.org>
Cc:	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"Chris Lalancette" <clalance@...hat.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH]: Fix Xen domU boot with batched	
	 mprotect

>>> Jeremy Fitzhardinge <jeremy@...p.org> 15.10.08 18:23 >>>
>>  But
>> performance-wise, CONFIG_HIGHPTE sucks under Xen anyway, so you'd
>> better not turn this on in the first place. We may want/need to provide
>> a means to disable this at run time so the same kernel when run natively
>> could still make use of it, but without impacting performance under Xen.
>>   
>
>That's a secondary issue.  What's the source of the performance hit?  
>Just all the extra kmap_atomic operations?

Yes, afaict.

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