linux-kernel - Re: [RFC PATCH 3/3 -v2] x86,smp: auto tune spinlock backoff delay factor

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Date:	Wed, 26 Dec 2012 11:27:19 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	aquini@...hat.com, walken@...gle.com, lwoodman@...hat.com,
	jeremy@...p.org, Jan Beulich <JBeulich@...ell.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tom Herbert <therbert@...gle.com>
Subject: Re: [RFC PATCH 3/3 -v2] x86,smp: auto tune spinlock backoff delay
 factor

On Wed, 2012-12-26 at 11:10 -0800, Eric Dumazet wrote:

> +#define DELAY_HASH_SHIFT 4
> +DEFINE_PER_CPU(int [1 << DELAY_HASH_SHIFT], spinlock_delay) = { 
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +	MIN_SPINLOCK_DELAY, MIN_SPINLOCK_DELAY,
> +};

This can use the following initialize by the way :

DEFINE_PER_CPU(int [1 << DELAY_HASH_SHIFT], spinlock_delay) = {
        [0 ... (1 << DELAY_HASH_SHIFT) - 1] = MIN_SPINLOCK_DELAY,
};



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