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

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Message-ID: <50D52C9F.9030808@redhat.com>
Date:	Fri, 21 Dec 2012 22:44:31 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Eric Dumazet <eric.dumazet@...il.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 12/21/2012 10:29 PM, Eric Dumazet wrote:
> 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);

Thanks for that cleanup. I have applied it to my code.

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