Re: [4.2, Regression] Queued spinlocks cause major XFS performance regression

[Linus Torvalds]

On Tue, Sep 8, 2015 at 3:05 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>
> Ah, so I think the confusion is in what we consider paravirt to mean. My
> definition of paravirt is that its a form of virtualization where the
> guest and host communicate over a software channel.

Like an architected bit in cpuid that the host sets if it wants the
guest to change its behavior?

             Linus
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