linux-kernel - Re: [PATCH tip/locking/core v9 4/6] locking/pvqspinlock: Collect slowpath lock statistics

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Message-ID: <563B933D.8010107@hpe.com>
Date:	Thu, 05 Nov 2015 12:34:53 -0500
From:	Waiman Long <waiman.long@....com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Scott J Norton <scott.norton@....com>,
	Douglas Hatch <doug.hatch@....com>,
	Davidlohr Bueso <dave@...olabs.net>
Subject: Re: [PATCH tip/locking/core v9 4/6] locking/pvqspinlock: Collect
 slowpath lock statistics

On 11/05/2015 12:09 PM, Peter Zijlstra wrote:
> On Thu, Nov 05, 2015 at 11:59:21AM -0500, Waiman Long wrote:
>>> Mostly I just wanted to point out that it was possible; you need not
>>> change to sysfs because debugfs lacks the capability.
>>>
>>> But now that you ask, I think debugfs might be the better place, such
>>> statistics (and the proposed CONFIG symbol) are purely for debug
>>> purposes, right?
>> Davidlohr had asked me to use per-cpu counters to reduce performance
>> overhead so that they can be usable in production system. That is another
>> reason why I move to sysfs.
> Yes, the per-cpu thing certainly makes sense. But as said, that does not
> require you to move to sysfs.
>
>> BTW, do you have comments on the other patches in the series? I would like
>> to collect all the comments before I renew the series.
> I still have to look at the last two patches, I've sadly not had time
> for that yet.

That is what I thought. Just let me know when you are done with the 
review, and I will update the patches and send out a new series.

Cheers,
Longman
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