linux-kernel - Re: [PATCH v11 0/4] Introducing a queue read/write lock implementation

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Message-ID: <20140131113003.GC3229@twins.programming.kicks-ass.net>
Date:	Fri, 31 Jan 2014 12:30:03 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	George Spelvin <linux@...izon.com>
Cc:	Waiman.Long@...com, akpm@...ux-foundation.org, andi@...stfloor.org,
	arnd@...db.de, aswin@...com, hpa@...or.com,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	mingo@...hat.com, paulmck@...ux.vnet.ibm.com,
	raghavendra.kt@...ux.vnet.ibm.com, riel@...hat.com,
	rostedt@...dmis.org, scott.norton@...com, tglx@...utronix.de,
	tim.c.chen@...ux.intel.com, torvalds@...ux-foundation.org,
	walken@...gle.com, x86@...nel.org
Subject: Re: [PATCH v11 0/4] Introducing a queue read/write lock
 implementation

On Fri, Jan 31, 2014 at 11:17:29AM +0100, Peter Zijlstra wrote:
> My main point was that we should seriously look at a ticket lock instead
> of the MCS one, because while the MCS has better contention behaviour,
> we shouldn't optimize locks for the worst contention.

In fact, I should have just used arch_spinlock_t and assumed it is a
ticket lock.
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