linux-kernel - Re: [PATCH v9 04/19] qspinlock: Extract out the exchange of tail code word

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Message-ID: <20140417154902.GO11096@twins.programming.kicks-ass.net>
Date:	Thu, 17 Apr 2014 17:49:02 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Waiman Long <Waiman.Long@...com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-arch@...r.kernel.org,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xenproject.org, kvm@...r.kernel.org,
	Paolo Bonzini <paolo.bonzini@...il.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Scott J Norton <scott.norton@...com>,
	Chegu Vinod <chegu_vinod@...com>
Subject: Re: [PATCH v9 04/19] qspinlock: Extract out the exchange of tail
 code word

On Thu, Apr 17, 2014 at 11:03:56AM -0400, Waiman Long wrote:
> @@ -192,36 +220,25 @@ void queue_spin_lock_slowpath(struct qspinlock *lock, u32 val)
>  	node->next = NULL;
>  
>  	/*
> +	 * We touched a (possibly) cold cacheline; attempt the trylock once
> +	 * more in the hope someone let go while we weren't watching as long
> +	 * as no one was queuing.
>  	 */
> +	if (!(val & _Q_TAIL_MASK) && queue_spin_trylock(lock))
> +		goto release;

But you just did a potentially very expensive op; @val isn't
representative anymore!
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