Subject: Re: [PATCH resend] powerpc: enable qspinlock and its virtualization support

From: Waiman Long <[email-masked]>
Date: Thu, 28 Apr 2016 17:07:54 -0400

On 04/28/2016 06:55 AM, Pan Xinhui wrote:
> From: Pan Xinhui<[email-masked]>
>
> This patch aims to enable qspinlock on PPC. And on pseries platform, it also support
> paravirt qspinlock.
>
> Signed-off-by: Pan Xinhui<[email-masked]>
> ---
>   arch/powerpc/include/asm/qspinlock.h               | 37 +++++++++++++++
>   arch/powerpc/include/asm/qspinlock_paravirt.h      | 36 +++++++++++++++
>   .../powerpc/include/asm/qspinlock_paravirt_types.h | 13 ++++++
>   arch/powerpc/include/asm/spinlock.h                | 31 ++++++++-----
>   arch/powerpc/include/asm/spinlock_types.h          |  4 ++
>   arch/powerpc/kernel/paravirt.c                     | 52 ++++++++++++++++++++++
>   arch/powerpc/lib/locks.c                           | 32 +++++++++++++
>   arch/powerpc/platforms/pseries/setup.c             |  5 +++
>   8 files changed, 198 insertions(+), 12 deletions(-)
>   create mode 100644 arch/powerpc/include/asm/qspinlock.h
>   create mode 100644 arch/powerpc/include/asm/qspinlock_paravirt.h
>   create mode 100644 arch/powerpc/include/asm/qspinlock_paravirt_types.h
>   create mode 100644 arch/powerpc/kernel/paravirt.c
>
>

This is just an enablement patch. You will also need a patch to activate 
qspinlock for, at lease, some PPC configs. Right?

It has dependency on the pv_wait() patch that I sent out extend the 
parameter list. Some performance data on how PPC system will perform 
with and without qspinlock will also be helpful data points.

Cheers,
Longman