Re: [Xen-devel] [PATCH] Bug-fixes to enable PV ticketlock to work under Xen PVHVM with Linux v3.12. (v1)

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

On Mon, Sep 09, 2013 at 11:34:42AM +0100, David Vrabel wrote:
> On 07/09/13 14:46, Konrad Rzeszutek Wilk wrote:
> > After a bit of false starts, lots of debugging, and tons of help from 
> > Stefano and
> > David on how event mechanism is suppose to work I am happy to present a set
> > of bug-fixes that make PV ticketlocks work under Xen PVHVM with Linux v3.12.
> > 
> > v3.12 has now thanks to commit 816434ec4a674fcdb3c2221a6dffdc8f34020550
> > (Merge branch 'x86-spinlocks-for-linus' of 
> > git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip)
> > PV ticketlocks. That means:
> >  - Xen PV bytelock has been replaced by Xen PV ticketlock.
> >  - Xen PVHVM is using ticketlock (not PV variant) - this patch makes it PV.
> >  - baremetal is still using ticketlocks.
> > 
> > In other words everything in the kernel is ticketlock based with the 
> > virtualizations
> > having the 'PV' part to aid.
> > 
> > Please take a look at the patches. If you are interested in testing them
> > out I will post a git tree on Monday based on v3.11 and v3.12-rc0. 
> > 
> > Note that I had not run any performance tests and I am not sure when I will
> > be able to (got other bugs to squash now). I've asked our internal 
> > performance
> > engineer to do some benchmarking - but those results won't be available for
> > some time as it takes time to do good benchmarking.
> 
> If there was favourable performance data I would be happy for these to
> go in 3.12, without I think they'll have to wait for 3.13.

Then they will have to wait.

I am not going to be able to provide those within this month.
> 
> David
> 
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