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

["zhenzhong.duan" <zhenzhong.duan@xxxxxxxxxx>]

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?

zduan


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