[Xen-devel] Re: [PATCH 00/20] x86: ticket lock rewrite and paravirtualization

["H. Peter Anvin" <hpa@xxxxxxxxx>]

On 11/15/2010 12:00 PM, Jeremy Fitzhardinge wrote:
> 
> Another approach I discussed with PeterZ and Mathieu is to steal the LSB
> of the ticket counters (halving the max CPU count) to use as a "there is
> someone in slowpath waiting on this lock".  But I haven't spent the time
> to work out an algorithm to maintain that flag (or flags, since there
> are bits available) in a correct and efficient way.
> 

Definitely worth pondering.

        -hpa


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