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

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Message-ID: <1356146982.21834.8321.camel@edumazet-glaptop>
Date:	Fri, 21 Dec 2012 19:29:42 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	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>
Subject: Re: [RFC PATCH 3/3 -v2] x86,smp: auto tune spinlock backoff delay
 factor

On Fri, 2012-12-21 at 18:56 -0500, Rik van Riel wrote:
> +	int *delay_ptr = &per_cpu(spinlock_delay, smp_processor_id());
> +	int delay = *delay_ptr;

int delay = __this_cpu_read(spinlock_delay);

>  	}
> +	*delay_ptr = delay;

__this_cpu_write(spinlock_delay, delay);


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