linux-kernel - Re: [PATCH 05/11] qspinlock: Optimize for smaller NR

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Message-ID: <20140707143503.GS6758@twins.programming.kicks-ass.net>
Date:	Mon, 7 Jul 2014 16:35:03 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Paolo Bonzini <pbonzini@...hat.com>
Cc:	Waiman.Long@...com, tglx@...utronix.de, mingo@...nel.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xenproject.org, kvm@...r.kernel.org,
	paolo.bonzini@...il.com, konrad.wilk@...cle.com,
	boris.ostrovsky@...cle.com, paulmck@...ux.vnet.ibm.com,
	riel@...hat.com, torvalds@...ux-foundation.org,
	raghavendra.kt@...ux.vnet.ibm.com, david.vrabel@...rix.com,
	oleg@...hat.com, gleb@...hat.com, scott.norton@...com,
	chegu_vinod@...com
Subject: Re: [PATCH 05/11] qspinlock: Optimize for smaller NR_CPUS

On Wed, Jun 18, 2014 at 01:39:52PM +0200, Paolo Bonzini wrote:
> Il 15/06/2014 14:47, Peter Zijlstra ha scritto:
> >
> >-	for (;;) {
> >-		new = (val & ~_Q_PENDING_MASK) | _Q_LOCKED_VAL;
> >-
> >-		old = atomic_cmpxchg(&lock->val, val, new);
> >-		if (old == val)
> >-			break;
> >-
> >-		val = old;
> >-	}
> >+	clear_pending_set_locked(lock, val);
> > 	return;
> 
> 
> Might as well add clear_pending_set_locked already in patch 3.

Patch 4, if anywhere.

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