Hi, is this combination supposed to work? Host kernel Linux waxh0015 3.0.14-grsec #1-Alpine SMP Thu Dec 22 10:31:30 UTC 2011 x86_64 Linux Xen Info: xen_major : 4 xen_minor : 1 xen_extra : .2 VM Kernel is: CentOS release 6.2 (Final) Kernel 2.6.32-220.2.1.el6.x86_64 on an x86_64 I was going to do a lot of tests today that would include hot-adding memory and cpus, and err, a recent distribution. Anyone successfully ballooning CentOS 6.2? Florian -- the purpose of libvirt is to provide an abstraction layer hiding all xen features added since 2006 until they were finally understood and copied by the kvm devs.
Balooning feature seems to be broken in CentOS/RHEL 6 stock kernels. You will
need to patch your guest kernel to make it work again.
Here is the patch against 2.6.32-220.el6 (backported from 3.1.6):
diff -Naru a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c
--- a/arch/x86/xen/setup.c 2011-11-08 23:06:47.000000000 +0200
+++ b/arch/x86/xen/setup.c 2012-01-04 16:30:19.468207563 +0200
@@ -146,9 +146,20 @@
domid_t domid = DOMID_SELF;
int ret;
- ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation, &domid);
- if (ret > 0)
- max_pages = ret;
+ /*
+ * For the initial domain we use the maximum reservation as
+ * the maximum page.
+ *
+ * For guest domains the current maximum reservation reflects
+ * the current maximum rather than the static maximum. In this
+ * case the e820 map provided to us will cover the static
+ * maximum region.
+ */
+ if (xen_initial_domain()) {
+ ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation,
&domid);
+ if (ret > 0)
+ max_pages = ret;
+ }
return min(max_pages, MAX_DOMAIN_PAGES);
}
On Fri, Jan 13, 2012 at 09:15:32AM +0100, Florian Heigl
wrote:> Hi,
>
> is this combination supposed to work?
>
> Host kernel
> Linux waxh0015 3.0.14-grsec #1-Alpine SMP Thu Dec 22 10:31:30 UTC 2011
> x86_64 Linux
>
> Xen Info:
> xen_major : 4
> xen_minor : 1
> xen_extra : .2
>
>
> VM Kernel is:
> CentOS release 6.2 (Final)
> Kernel 2.6.32-220.2.1.el6.x86_64 on an x86_64
>
> I was going to do a lot of tests today that would include hot-adding
> memory and cpus, and err, a recent distribution.
>
> Anyone successfully ballooning CentOS 6.2?
>
> Florian
>
> --
> the purpose of libvirt is to provide an abstraction layer hiding all
> xen features added since 2006 until they were finally understood and
> copied by the kvm devs.
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@lists.xensource.com
> http://lists.xensource.com/xen-users
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Ivan Fitenko <digitalhunger@gmail.com> schrieb:>diff -Naru a/arch/x86/xen/setup.c b/arch/x86/xen/setup.c >--- a/arch/x86/xen/setup.c 2011-11-08 23:06:47.000000000 +0200 >+++ b/arch/x86/xen/setup.c 2012-01-04 16:30:19.468207563 +0200 >@@ -146,9 +146,20 @@ > domid_t domid = DOMID_SELF; > int ret; > >- ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation, &domid); >- if (ret > 0) >- max_pages = ret; >+ /* >+ * For the initial domain we use the maximum reservation as >+ * the maximum page. >+ * >+ * For guest domains the current maximum reservation reflects >+ * the current maximum rather than the static maximum. In this >+ * case the e820 map provided to us will cover the static >+ * maximum region. >+ */ >+ if (xen_initial_domain()) { >+ ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation, >&domid); >+ if (ret > 0) >+ max_pages = ret; >+ } > return min(max_pages, MAX_DOMAIN_PAGES); > }...thanx too here. ß) best regards and nice weekend, Niels. - -- Niels Dettenbach Syndicat IT&Internet http://www.syndicat.com -----BEGIN PGP SIGNATURE----- Version: APG v1.0.8 iIEEAREIAEEFAk8QJeg6HE5pZWxzIERldHRlbmJhY2ggKFN5bmRpY2F0IElUJklu dGVybmV0KSA8bmRAc3luZGljYXQuY29tPgAKCRBU3ERlZRyiDVGcAJ9SfrTmbdmq g+HrcVURB+enS2tsegCfQrq0N166b5lmFKlevzZ2Amxa4No=SjHu -----END PGP SIGNATURE----- _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Do you know if there is a bug for this in CentOS / Redhat BZ? Because we need to "help them make good software!" Florian 2012/1/13 Niels Dettenbach (Syndicat IT&Internet) <nd@syndicat.com>:> -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA256 >>+ if (xen_initial_domain()) { >>+ ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation,-- the purpose of libvirt is to provide an abstraction layer hiding all xen features added since 2006 until they were finally understood and copied by the kvm devs.
Never heard of any, and a brief search for ''xen'' and ''baloon'' yielded nothing. Feel free to report it yourself if you wish, but I doubt that the report would get much attention knowing RH''s ''love'' to xen (btw, you''ve got a great signature! ;) ) On Fri, Jan 13, 2012 at 03:07:06PM +0100, Florian Heigl wrote:> Do you know if there is a bug for this in CentOS / Redhat BZ? > Because we need to "help them make good software!" > > Florian > > 2012/1/13 Niels Dettenbach (Syndicat IT&Internet) <nd@syndicat.com>: > > -----BEGIN PGP SIGNED MESSAGE----- > > Hash: SHA256 > >>+ if (xen_initial_domain()) { > >>+ ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation, > > -- > the purpose of libvirt is to provide an abstraction layer hiding all > xen features added since 2006 until they were finally understood and > copied by the kvm devs.
I''m actually have talk about this problem with pv_ops kernels about two years. Centos/rhel 5 hasn''t this problem (-xen kernel), all pv_ops kernels (include those on xs-tools.iso do have this problems at least from XCP 0.1). On 13.01.2012 18:07, Florian Heigl wrote:> Do you know if there is a bug for this in CentOS / Redhat BZ? > Because we need to "help them make good software!" > > Florian > > 2012/1/13 Niels Dettenbach (Syndicat IT&Internet)<nd@syndicat.com>: >> -----BEGIN PGP SIGNED MESSAGE----- >> Hash: SHA256 >>> + if (xen_initial_domain()) { >>> + ret = HYPERVISOR_memory_op(XENMEM_maximum_reservation,