linux-kernel - Re: [RFC] Implement Batched (group) ticket lock

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Message-ID: <53868AD2.7020902@redhat.com>
Date:	Wed, 28 May 2014 21:18:10 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Peter Anvin <hpa@...or.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Gleb Natapov <gleb@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Waiman Long <waiman.long@...com>,
	Dave Jones <davej@...hat.com>, Oleg Nesterov <oleg@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Andi Kleen <ak@...ux.intel.com>,
	Jason Wang <jasowang@...hat.com>, fernando_b1@....ntt.co.jp,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>,
	virtualization <virtualization@...ts.linux-foundation.org>,
	xen-devel@...ts.xenproject.org,
	Marcelo Tosatti <mtosatti@...hat.com>,
	"Vinod, Chegu" <chegu_vinod@...com>
Subject: Re: [RFC] Implement Batched (group) ticket lock

On 05/28/2014 06:19 PM, Linus Torvalds wrote:

> If somebody has a P4 still, that's likely the worst case by far.

I'm sure cmpxchg isn't the only thing making P4 the worst case :)

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