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

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Message-ID: <53585144.4070309@hp.com>
Date:	Wed, 23 Apr 2014 19:48:20 -0400
From:	Waiman Long <waiman.long@...com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	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>,
	"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 04/23/2014 06:24 PM, Waiman Long wrote:
> On 04/23/2014 01:55 PM, Konrad Rzeszutek Wilk wrote:
>> On Wed, Apr 23, 2014 at 01:43:58PM -0400, Waiman Long wrote:
>>> On 04/23/2014 10:56 AM, Konrad Rzeszutek Wilk wrote:
>>>> On Wed, Apr 23, 2014 at 10:23:43AM -0400, Waiman Long wrote:
>>>>> 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?
>>>> Um, it needs to have Acks from KVM and Xen maintainers who have not
>>>> done so. Also Peter needs to chime in. (BTW, please CC
>>>> xen-devel@...ts.xenproject.org next time you post so that David and 
>>>> Boris
>>>> can take a peek at it).
>>> I will cc xen-devel@...ts.xenproject.org when I sent out the next 
>>> patch.
>>>
>>>> I would strongly recommend you put all your patches on github (free 
>>>> git
>>>> service) so that we can test it and poke it at during your vacation
>>>> (and even after).
>>>>
>>> I am not used to setting up a public repo in github. If I create a
>>> repo there, should I put a snapshot of the whole kernel source tree
>>> or just a portion of the relevant files as the base? With the later,
>>> it won't be buildable.
>> You just push your local branch. It should look like a normal
>> Linux tree with your commits on top.
>
> I will try that with my next version.
>

I have just pushed my git repo out to 
https://github.com/longman88/kernel-qspinlock.

-Longman
> -Longman
>
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