Re: [PATCH 8/5] llist: Remove cpu_relax() usage in cmpxchg loops

[Peter Zijlstra]

On Tue, 2011-09-13 at 14:43 +0300, Avi Kivity wrote:

> Another issue is that hypervisors use PAUSE to detect a spinning guest 
> and issue a directed yield to another vcpu.  But for cmpxchg loops, the 
> "spinner" would just commit on the next loop, no?  So I think there's no 
> objection from that front.

Right, we shouldn't ever spend a significant amount spinning on a
cmpxchg. If we do we need to fix that instead.
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