[PATCH 0/6] x86: reduce paravirtualized spinlock overhead

Jeremy Fitzhardinge
Thu, 30 Apr 2015 16:39:54 -0000

On 04/30/2015 03:53 AM, Juergen Gross wrote:
> Paravirtualized spinlocks produce some overhead even if the kernel is
> running on bare metal. The main reason are the more complex locking
> and unlocking functions. Especially unlocking is no longer just one
> instruction but so complex that it is no longer inlined.
>
> This patch series addresses this issue by adding two more pvops
> functions to reduce the size of the inlined spinlock functions. When
> running on bare metal unlocking is again basically one instruction.

Out of curiosity, is there a measurable difference?

    J