Messages in this thread | | | Date | Tue, 14 Dec 2010 17:06:55 -0800 | From | "H. Peter Anvin" <> | Subject | Re: [cpuops cmpxchg V2 5/5] cpuops: Use cmpxchg for xchg to avoid lock semantics |
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On 12/14/2010 09:29 AM, Tejun Heo wrote: > Hello, > > On 12/14/2010 06:22 PM, H. Peter Anvin wrote: >> On 12/14/2010 09:19 AM, Christoph Lameter wrote: >>>> >>>> Is it genuinely faster to do the pre-load mov, or can we drop that too? >>>> My guess would be that yes it is, but if it happens not to be it would >>>> be nice to reduce the code size. >>> >>> Dropping the load increases the cycle count from 11 to 16. >> >> Great, that answers that! I'll pick up the patch hopefully today (I'm >> finally ramping back up on arch/x86 again after having been diverted to >> an internal project for a while...) > > How do you want to route these? All patches before this series is > already in the percpu tree. I can pull the generic bits and leave out > the x86 bits so that x86 tree can pull in percpu bits and then put x86 > stuff on top of it. If you wanna go that way, I would drop all x86 > related patches from the previous patchsets too. >
It's probably easiest if you just add them with my Acked-by: then. Alternatively, I could pick them up so they go into -tip and the tip test machinery.
-hpa
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