Re: [Xen-devel] [PATCH] [shadow] Disable higher level pagetables early unshadow only when the "process dying" hypercall is used.

[Gianluca Guida <glguida@xxxxxxxxx>]

Hi George,

On Wed, Dec 14, 2011 at 7:58 AM, George Dunlap <dunlapg@xxxxxxxxx> wrote:
> On Wed, Nov 16, 2011 at 1:44 PM, Gianluca Guida <glguida@xxxxxxxxx> wrote:
>> This patch fixes a performance problem in fully virtualized guests.
>
> What performance problem, and how does it fix it?  The c/s doesn't
> have any information about either, so it's hard for me to evaluate
> whether I should pull it into the XenServer patchqueue...

Have a look at this:

http://old-list-archives.xen.org/archives/html/xen-devel/2011-11/msg00650.html

A good question is whether the performance improvement that brought
Stefano to implement the hypercall in Linux was due to the original
patch creating a regression or if it really helps even after the
performance regression is fixed.

I wasn't here on the Xen world while the patch was tested on unstable,
so i have no idea about it.

Gianluca

-- 
It was a type of people I did not know, I found them very strange and
they did not inspire confidence at all. Later I learned that I had been
introduced to electronic engineers.
                                                  E. W. Dijkstra

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