linux-kernel - Re: [PATCH 5/7] locking/pvqspinlock: Add pending bit support

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Message-ID: <20150712082158.GR19282@twins.programming.kicks-ass.net>
Date:	Sun, 12 Jul 2015 10:21:58 +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 5/7] locking/pvqspinlock: Add pending bit support

On Sat, Jul 11, 2015 at 04:36:56PM -0400, Waiman Long wrote:
> Like the native qspinlock, using the pending bit when it is lightly
> loaded to acquire the lock is faster than going through the PV queuing
> process which is even slower than the native queuing process. It also
> avoids loading two additional cachelines (the MCS and PV nodes).
> 
> This patch adds the pending bit support for PV qspinlock. The
> pending bit code has a smaller spin threshold. It will default back
> to the queuing method if it cannot acquired the lock within a certain
> time limit.

-ENONUMBERS
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