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

[Peter Hurley <peter@hurleysoftware.com>]

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;