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Subject: Re: [RFC] implement QUEUED spinlocks on powerpc
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Eric Dumazet <eric.dumazet@gmail.com>, Paul Mackerras <paulus@samba.org>,
 Michael Ellerman <mpe@ellerman.id.au>
Cc: linuxppc-dev@lists.ozlabs.org, Kevin Hao <haokexin@gmail.com>, Torsten
 Duwe <duwe@suse.de>, Eric Dumazet <edumazet@google.com>, Pan Xinhui
 <xinhui.pan@linux.vnet.ibm.com>
Date: Thu, 02 Feb 2017 07:37:25 +1100
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On Wed, 2017-02-01 at 09:05 -0800, Eric Dumazet wrote:
> Hi all
> 
> Is anybody working on adding QUEUED spinlocks to powerpc 64bit ?
> 
> I've seen past attempts with ticket spinlocks
> ( https://patchwork.ozlabs.org/patch/449381/ and other related links
> )
> 
> But it looks ticket spinlocks are a thing of the past.

Yes, we have a tentative implementation of qspinlock and pv variants:

https://patchwork.ozlabs.org/patch/703139/
https://patchwork.ozlabs.org/patch/703140/
https://patchwork.ozlabs.org/patch/703141/
https://patchwork.ozlabs.org/patch/703142/
https://patchwork.ozlabs.org/patch/703143/
https://patchwork.ozlabs.org/patch/703144/

Michael, what's the status with getting that merged ?

Cheers,
Ben.