linux-kernel - Re: [PATCH 6/7] locking/qspinlock: A fairer queued unfair lock

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Message-ID: <20150712082105.GQ19282@twins.programming.kicks-ass.net>
Date:	Sun, 12 Jul 2015 10:21:05 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Waiman Long <Waiman.Long@...com>
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>
Subject: Re: [PATCH 6/7] locking/qspinlock: A fairer queued unfair lock

On Sat, Jul 11, 2015 at 04:36:57PM -0400, Waiman Long wrote:
> For a virtual guest with the qspinlock patch, a simple unfair byte lock
> will be used if PV spinlock is not configured in or the hypervisor
> isn't either KVM or Xen. 

Why do we care about this case enough to add over 300 lines of code?
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