Re: Preemptable Ticket Spinlock

[Peter Zijlstra]

On Sun, 2013-04-21 at 17:12 -0400, Rik van Riel wrote:
> 
> If we always incremented the ticket number by 2 (instead of 1), then
> we could use the lower bit of the ticket number as the spinlock.

ISTR that paravirt ticket locks already do that and use the lsb to
indicate the unlock needs to perform wakeups.

Also, since all of this is virt nonsense, shouldn't it live in the
paravirt ticket lock code and leave the native code as is?

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