Re: [PATCH] seqlock: serialize against writers

[Gregory Haskins]

Andi Kleen wrote:
>> Im running it on a x86_64 box as we speak.  How can I tell if there is a
>> certain mode that is permitting this?
>>     
>
> If the boot up says you're running with PMtimer then it uses the fallback
> (usually happens on pre Fam10h AMD boxes). A typical Intel box
> would use the faster ring 3 only TSC path and then explode with your
> change I bet. 
>   

Thinking about this some more, perhaps the issue is I am not hitting the
contended path in vsyscall?

-Greg

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