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

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Date:	Mon, 07 Jul 2014 18:10:30 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Peter Zijlstra <peterz@...radead.org>
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

Il 07/07/2014 17:35, Peter Zijlstra ha scritto:
>> > Unlike the change in patch 4, clear_pending_set_locked doesn't change how
>> > qspinlock moves from a state to the next.
> True, but its where we start to break up into smaller functions. And the
> only reason we break them out is because we'll get different
> implementations depending on NR_CPUS.
>
> So we can view the breakout of xchg_tail and clear_and_set_pending as
> preparatory work for introducing the NR_CPUS thing.

That's a different reasoning, but it's fine by me too.

Paolo
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