linux-kernel - Re: [RFC PATCH] Linux kernel Wait-Free Concurrent Queue Implementation

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Message-ID: <1363308584.3194.124.camel@thor.lan>
Date:	Thu, 14 Mar 2013 20:49:44 -0400
From:	Peter Hurley <peter@...leysoftware.com>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Eric Wong <normalperson@...t.net>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Stephen Hemminger <shemminger@...tta.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] Linux kernel Wait-Free Concurrent Queue
 Implementation

On Mon, 2013-03-11 at 17:36 -0400, Mathieu Desnoyers wrote:
> +/*
> + * Do not put head and tail on the same cache-line if concurrent
> + * enqueue/dequeue are expected from many CPUs. This eliminates
> + * false-sharing between enqueue and dequeue.
> + */
> +struct wfcq_head {
> +	struct wfcq_node node;
> +	struct mutex lock;
> +};
> +
> +struct wfcq_tail {
> +	struct wfcq_node *p;
> +};


If you want to force separate cachelines for SMP, this would be

struct wfcq_head {
	struct wfcq_node node;
	struct mutex lock;
} ____cacheline_aligned_in_smp;

struct wfcq_tail {
	struct wfcq_node *p;
} ____cacheline_aligned_in_smp;

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