linux-kernel - Re: Where do we stand with the Xen patches?

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Date:	Sun, 17 May 2009 20:37:29 +0200
From:	devzero@....de
To:	Jeremy Fitzhardinge <jeremy@...p.org>, Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Where do we stand with the Xen patches?

>> Aside from some whitespace issues around some Impact: lines, I 
>> don't know of any outstanding problems.  (I just pushed an updates 
>> to these branches to fix those, and fold a change to address 
>> Jesse's comment.)
>>
>> Please tell me if you have any further issues which prevents you 
>> from pulling these changes.  Otherwise I'd appreciate it if you 
>> pulled them soon, as we're already on -rc5, and I have more 
>> changes I'd like to prep for the next merge window.
>
>As in the past, my main worry is performance overhead of paravirt in 
>general.
>
>The patches that dont affect any native kernel fast path are 
>probably OK (but still pending final review).
>
>Regarding patches that do change the fastpath i'll do a round of 
>measurements of CONFIG_PARAVIRT against !CONFIG_PARAVIRT kernels, 
>and make up my mind based on that.
>
>You could accelerate this by sending some "perf stat" hard numbers 
>to give us an idea about where we stand today.
>
>	Ingo

maybe this is iust a stupid comment (please forgive, iŽm no advanced kernel
hacker), but canŽt the code inserted by the patches and which changes the 
fastpath just #IFDEF`ed at the critical offsets ?  (as building a dom0 kernel is 
just another build target, isn`t it ?)

regards
roland
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