Messages in this thread | | | Date | Mon, 15 Nov 2010 12:03:27 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [PATCH 00/20] x86: ticket lock rewrite and paravirtualization |
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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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