linux-kernel - Re: [RFC PATCH 2/3] x86,smp: proportional backoff for ticket spinlocks

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Message-ID: <CANN689E74WQfKUb+tOc=GtD6K6BGaaGgFC-NRuZyvsXtBgi1Wg@mail.gmail.com>
Date:	Fri, 21 Dec 2012 20:44:46 -0800
From:	Michel Lespinasse <walken@...gle.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, aquini@...hat.com,
	lwoodman@...hat.com, jeremy@...p.org,
	Jan Beulich <JBeulich@...ell.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH 2/3] x86,smp: proportional backoff for ticket spinlocks

On Fri, Dec 21, 2012 at 3:51 PM, Rik van Riel <riel@...hat.com> wrote:
> Subject: x86,smp: proportional backoff for ticket spinlocks
>
> Simple fixed value proportional backoff for ticket spinlocks.
> By pounding on the cacheline with the spin lock less often,
> bus traffic is reduced. In cases of a data structure with
> embedded spinlock, the lock holder has a better chance of
> making progress.
>
> Signed-off-by: Rik van Riel <riel@...hat.com>

Looks fine to me other than the arbitrary-ness of 50

Reviewed-by: Michel Lespinasse <walken@...gle.com>

-- 
Michel "Walken" Lespinasse
A program is never fully debugged until the last user dies.
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