linux-kernel - Re: [PATCH v5 1/6] locking/pvqspinlock: Unconditional PV kick with _Q_SLOW

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Date:	Sat, 8 Aug 2015 08:02:49 +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>,
	Davidlohr Bueso <dave@...olabs.net>
Subject: Re: [PATCH v5 1/6] locking/pvqspinlock: Unconditional PV kick with
 _Q_SLOW_VAL

On Fri, Aug 07, 2015 at 11:17:56PM -0400, Waiman Long wrote:
> If _Q_SLOW_VAL has been set, the vCPU state must have been vcpu_hashed.
> The extra check at the end of __pv_queued_spin_unlock() is unnecessary
> and so is removed.

This is half the patch it should be.

Because if the load is not needed, then the store is not either, and
then there's the comments to update.
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