Re: [Xen-devel] kernel bootup slow issue on ovm3.1.1

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 29 Aug 2012, zhenzhong.duan wrote:
> 
> On 2012-08-13 19:08, Stefano Stabellini wrote:
> > On Mon, 13 Aug 2012, Jan Beulich wrote:
> >
> > I tried to use PV spinlocks on PV on HVM guests but I found that:
> >
> > commit f10cd522c5fbfec9ae3cc01967868c9c2401ed23
> > Author: Stefano Stabellini<stefano.stabellini@xxxxxxxxxxxxx>
> > Date:   Tue Sep 6 17:41:47 2011 +0100
> >
> >      xen: disable PV spinlocks on HVM
> >
> >      PV spinlocks cannot possibly work with the current code because they 
> > are
> >      enabled after pvops patching has already been done, and because PV
> >      spinlocks use a different data structure than native spinlocks so we
> >      cannot switch between them dynamically. A spinlock that has been taken
> >      once by the native code (__ticket_spin_lock) cannot be taken by
> >      __xen_spin_lock even after it has been released.
> >
> >      Reported-and-Tested-by: Stefan Bader<stefan.bader@xxxxxxxxxxxxx>
> >      Signed-off-by: Stefano Stabellini<stefano.stabellini@xxxxxxxxxxxxx>
> >      Signed-off-by: Konrad Rzeszutek Wilk<konrad.wilk@xxxxxxxxxx>
> >
> >
> > at that time Jeremy was finishing off his PV ticket locks series, that
> > has the nice side effect of making it much easier to implement PV on HVM
> > spin locks so I just deciced to wait and just append the following patch
> > to his series:
> >
> > http://marc.info/?l=xen-devel&m=131846828430409&w=2
> >
> > that clearly never went upstream.
> Hi Stefano,
> Is there a schedule those patch merge to upstream?

They are currently being handled by the KVM guys:

https://lkml.org/lkml/2012/5/2/119
 

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