Re: [Xen-devel] Linux v3.12 + pv ticketlocks

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Sep 11, 2013 at 08:25:01PM +0200, Sander Eikelenboom wrote:
> Hi Konrad,
> 
> Just to confirm:
> 
> - PV ticketlocks is on by default and doesn't neet a config option, to 
> disable it at boot time it's  possible to use "xen_nopvspin" as a kernel 
> commandline parameter

Yes.
> - CONFIG_PARAVIRT_SPINLOCKS should be off, since that would enable the old 
> bytelock pv-spinlock implementation which could now probably be removed ?

You still need CONFIG_PARAVIRT_SPINLOCKS=y to take advantage of it.

The bytelock pvspinlock is gone. If you compile without 
CONFIG_PARAVIRT_SPINLOCKS
then you will only use ticketlocks for all types of guests and baremtal. No
'PV' variant.

The CONFIG_PARAVIRT_SPINLOCKS=y enables the PV ticketlock for all guests.

> 
> Have a nice vacation !
> 
> --
> Sander
> 

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