linux-kernel - Re: [PATCH v10 12/19] unfair qspinlock: Variable frequency lock stealing mechanism

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Message-ID: <20140508191944.GT2844@laptop.programming.kicks-ass.net>
Date:	Thu, 8 May 2014 21:19:44 +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>,
	Boris Ostrovsky <boris.ostrovsky@...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 v10 12/19] unfair qspinlock: Variable frequency lock
 stealing mechanism

On Wed, May 07, 2014 at 11:01:40AM -0400, Waiman Long wrote:
> +#define DEF_LOOP_CNT(c)		int c = 0
> +#define INC_LOOP_CNT(c)		(c)++
> +#define LOOP_CNT(c)		c
> +#define LSTEAL_MIN		(1 << 3)
> +#define LSTEAL_MAX		(1 << 10)
> +#define LSTEAL_MIN_MASK		(LSTEAL_MIN - 1)
> +#define LSTEAL_MAX_MASK		(LSTEAL_MAX - 1)

*groan*.. why do you have to write the most obfuscated code ever? We're
not ioccc.org.


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