Re: [PATCH] Re: tmem on 4.1 (was [Xen-devel] Re: Freeze schedule)

["Olivier B." <xen.list@xxxxxxxxx>]

Le 20/01/2011 08:17, Keir Fraser a écrit :
> On 19/01/2011 21:38, "Dan Magenheimer"<dan.magenheimer@xxxxxxxxxx>  wrote:
>
> > Just to check again, has anyone actually seen a problem with
> > tmem enabled by default recently?  I agree that there is still
> > theoretically a problem, but there is the same problem with
> > normal guests doing lots of ballooning as well.  Also, note
> > that even if tmem defaults to enabled, the problem is impossible
> > unless a guest enables tmem (or, in the case of SuSE, dom0).
> > And even if a guest does enable tmem, the problem manifested
> > largely due to shadow pages using order>0 (now fixed?)...
> > failure on domain creation can happen for many reasons and
> > is much less of an issue, true?
> >
> > Feel free to shoot me down with more evidence, but I have
> > to at least provide token resistance to this patch.  Distros
> > might certainly choose to disable it to avoid any risk at
> > all, but turning it off anymore seems overkill for xen.org
> > open source Xen IMHO.
> Tbh I was wondering whether anyone is really using it in earnest. No
> upstream kernels support it? If noone's using it, who really cares whether
> it's enabled or not, apart from its author.
>
>   -- Keir

Well, it is present but disabled in the new Debian Squeeze kernel... and 
as there is no documentation, there is no chance to see it enabled.
I had to search on the xen lists to find how to enable that.

For example :
http://www.google.fr/search?hl=fr&source=hp&q=tmem_compress

We should maybe add info about tmem on the Xen Wiki, no ?

Olivier

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel