linux-kernel - Re: [PATCH v3 0/7] locking/qspinlock: Enhance pvqspinlock performance

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Message-ID: <1437959930.25997.33.camel@stgolabs.net>
Date:	Sun, 26 Jul 2015 18:18:50 -0700
From:	Davidlohr Bueso <dave@...olabs.net>
To:	Waiman Long <Waiman.Long@...com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	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>
Subject: Re: [PATCH v3 0/7] locking/qspinlock: Enhance pvqspinlock
 performance

On Wed, 2015-07-22 at 16:12 -0400, Waiman Long wrote:
> Patch 3 allows the collection of various count data that are useful
> to see what is happening in the system. They do add a bit of overhead
> when enabled slowing performance a tiny bit.

Ah ok you do mention the overhead. Hmmm but what's a tiny bit? A kernel
build comparison would be pretty nice to have a "usability" view.

Thanks,
Davidlohr

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