Re: Preemptable Ticket Spinlock

[Rik van Riel]

On 04/22/2013 03:49 PM, Peter Zijlstra wrote:
> On Mon, 2013-04-22 at 08:52 -0400, Rik van Riel wrote:

> > If the native spin_lock code has been called already at
> > that time, the native code would still need to be modified
> > to increment the ticket number by 2, so we end up with a
> > compatible value in each spin lock's .tickets field, and
> > prevent a deadlock after we switch over to the paravirt
> > variant.
>
> I thought the stuff already made it upstream, but apparently not; the
> lastest posting I'm aware of is here:
>
>    https://lkml.org/lkml/2012/5/2/105
>
> That stuff changes the normal ticket increment as well..

Jiannan,

It looks like the patch above could make a good patch
1 (or 2) in your patch series :)

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