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

[Peter Zijlstra]

On Fri, Sep 04, 2015 at 05:11:43PM +1000, Dave Chinner wrote:
> $ grep PARAVIRT .config
> CONFIG_PARAVIRT=y
> # CONFIG_PARAVIRT_DEBUG is not set
> # CONFIG_PARAVIRT_SPINLOCKS is not set
> CONFIG_PARAVIRT_TIME_ACCOUNTING=y
> CONFIG_PARAVIRT_CLOCK=y
> $

Curious, with PARAVIRT_SPINLOCKS=n we _should_ end up in
virt_queued_spin_lock() which is a simple test-and-set lock, much like
the lock debugging code should end up being.


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