On 11/03/2010 07:59 AM, Jeremy Fitzhardinge wrote:
>
> - with an unmodified struct spinlock, it can check to see if
> head == tail after unlock; if not, then there's someone else
> trying to lock, and we can do a kick. Unfortunately this
> generates very high level of redundant kicks, because the
> waiting CPU might not have blocked yet (which is the common
> case)
>
How high is "very high" here -- most of the time (so that any mitigation
on the slow patch is useless)?
-hpa
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