linux-kernel - Re: [PATCH v9 05/19] qspinlock: Optimize for smaller NR

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Date:	Wed, 23 Apr 2014 10:23:43 -0400
From:	Waiman Long <waiman.long@...com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-arch@...r.kernel.org,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xenproject.org, kvm@...r.kernel.org,
	Paolo Bonzini <paolo.bonzini@...il.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Scott J Norton <scott.norton@...com>,
	Chegu Vinod <chegu_vinod@...com>
Subject: Re: [PATCH v9 05/19] qspinlock: Optimize for smaller NR_CPUS

On 04/18/2014 05:40 PM, Waiman Long wrote:
> On 04/18/2014 03:05 PM, Peter Zijlstra wrote:
>> On Fri, Apr 18, 2014 at 01:52:50PM -0400, Waiman Long wrote:
>>> I am confused by your notation.
>> Nah, I think I was confused :-) Make the 1 _Q_LOCKED_VAL though, as
>> that's the proper constant to use.
>
> Everyone gets confused once in a while:-) I have plenty of that myself.
>
> I will change 1 to _Q_LOCKED_VAL as suggested.
>
> -Longman


The attached patch file contains the additional changes that I had made 
to qspinlock.c file so far. Please let me know if you or others have any 
additional feedbacks or changes that will need to go to the next version 
of the patch series.

I am going to take vacation starting from tomorrow and will be back on 
5/5 (Mon). So I will not be able to respond to emails within this period.

BTW, is there any chance that this patch can be merged to 3.16?

-Longman

View attachment "qspinlock_extra_diff.patch" of type "text/plain" (4672 bytes)