linux-kernel - Re: [PATCH v3 2/2] qspinlock, x86: Enable x86-64 to use queue spinlock

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Message-ID: <52EA8FAA.8080803@redhat.com>
Date:	Thu, 30 Jan 2014 12:45:14 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Waiman Long <Waiman.Long@...com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Arnd Bergmann <arnd@...db.de>
CC:	linux-arch@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michel Lespinasse <walken@...gle.com>,
	Andi Kleen <andi@...stfloor.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	George Spelvin <linux@...izon.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Daniel J Blueman <daniel@...ascale.com>,
	Alexander Fyodorov <halcy@...dex.ru>,
	Aswin Chandramouleeswaran <aswin@...com>,
	Scott J Norton <scott.norton@...com>,
	Thavatchai Makphaibulchoke <thavatchai.makpahibulchoke@...com>
Subject: Re: [PATCH v3 2/2] qspinlock, x86: Enable x86-64 to use queue spinlock

On 01/28/2014 01:19 PM, Waiman Long wrote:
> This patch makes the necessary changes at the x86 architecture
> specific layer to enable the use of queue spinlock for x86-64. As
> x86-32 machines are typically not multi-socket. The benefit of queue
> spinlock may not be apparent. So queue spinlock is not enabled.
>
> Currently, there is some incompatibilities between the para-virtualized
> spinlock code (which hard-codes the use of ticket spinlock) and the
> queue spinlock. Therefore, the use of queue spinlock is disabled when
> the para-virtualized spinlock is enabled.
>
> Signed-off-by: Waiman Long <Waiman.Long@...com>

Acked-by: Rik van Riel <riel@...hat.com>

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