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    SubjectRe: [4.2, Regression] Queued spinlocks cause major XFS performance regression
    On Fri, Sep 04, 2015 at 05:30:35PM +0200, Peter Zijlstra wrote:
    > Should I place the virt_spin_lock() thing under CONFIG_PARAVIRT (maybe
    > even _SPINLOCKS) such that only paravirt enabled kernels when ran on a
    > hypervisor that does not support paravirt patching (HyperV, VMware,
    > etc..) revert to the test-and-set?

    Ah, CONFIG_HYPERVISOR_GUEST seems fitting, that's a prerequisite for all
    the PARAVIRT options too.



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