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

["Olivier B." <xen.list@daevel.fr>]

Le 20/01/2011 09:23, Ian Campbell a écrit :
> On Thu, 2011-01-20 at 08:07 +0000, Olivier B. wrote:
>> Well, it is present but disabled in the new Debian Squeeze kernel...
> Do you really mean the kernel (i.e. Linux) or do you really mean the
> hypervisor?
>
> I was not aware of any tmem support (disabled or otherwise) in the
> Debian Squeeze Linux _kernel_. It hasn't been deliberately patched in
> and it does not appear to be in the xen.git snapshot used in the Xen
> dom0 flavour of the kernel.
>
> You are right that it is present and disabled in the Squeeze hypervisor
> -- this is simply the default in the Xen 4.0.1 release and hasn't been
> tweaked by Debian.
>
> Ian.
>

I don't know, on a Squeeze Dom0 with "tmem" parameters on default 
hypervisor and kernel, I have that :

root! yunze:~# xm tmem-list -a
G=Tt:39,Te:0,Cf:0,Af:0,Pf:0,Ta:0,Lm:0,Et:0,Ea:0,Rt:0,Ra:0,Rx:0,Fp:0
T=Gn:0,Gt:0,Gx:0,Gm:2147483647,Pn:0,Pt:0,Px:0,Pm:2147483647,gn:0,gt:0,gx:0,gm:2147483647,pn:0,pt:0,px:0,pm:2147483647,Fn:0,Ft:0,Fx:0,Fm:2147483647,On:0,Ot:0,Ox:0,Om:2147483647,Cn:0,Ct:0,Cx:0,Cm:2147483647,cn:0,ct:0,cx:0,cm:2147483647,dn:0,dt:0,dx:0,dm:2147483647


Is it "suffisant" to say that it works ?

but :
root! yunze:~# xm list 9
Name                                        ID   Mem VCPUs      State   
Time(s)
rome                                         9   512     2     
-b----     11.8
root! yunze:~# xm tmem-list 9
-1

and from the VM :
root! rome:~# cat /proc/cmdline
root=/dev/mapper/vg--rome-root ro rootflags=data=writeback rootdelay=1 
panic=60 swiotlb=force iommu=soft tmem
root! rome:~# uname -a
Linux rome 2.6.32-5-xen-amd64 #1 SMP Wed Jan 12 05:46:49 UTC 2011 x86_64 
GNU/Linux

But as I was saying, this is difficult to find any documentation, so I 
really don't know what is wrong or not...

Olivier