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

From: Peter Zijlstra
Date: Mon Sep 07 2015 - 02:57:29 EST

On Sun, Sep 06, 2015 at 05:05:46PM -0700, Davidlohr Bueso wrote:
> On Fri, 04 Sep 2015, Peter Zijlstra wrote:
> >-static inline bool virt_queued_spin_lock(struct qspinlock *lock)
> >+static inline bool virt_spin_lock(struct qspinlock *lock)
> Given that we fall back to the cmpxchg loop even when PARAVIRT is not in the
> picture, I believe this function is horribly misnamed.

Just to continue the argument for arguments sake, the function is named
'virt' (not paravirt) and tests the HYPERVISOR CPUID bit. How is that
not appropriately named?
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