linux-kernel - Re: [(RT RFC) PATCH v2 8/9] adjust pi

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Message-ID: <20080225221033.GJ2659@elf.ucw.cz>
Date:	Mon, 25 Feb 2008 23:10:33 +0100
From:	Pavel Machek <pavel@....cz>
To:	Gregory Haskins <ghaskins@...ell.com>
Cc:	mingo@...e.hu, a.p.zijlstra@...llo.nl, tglx@...utronix.de,
	rostedt@...dmis.org, linux-rt-users@...r.kernel.org,
	linux-kernel@...r.kernel.org, bill.huey@...il.com,
	kevin@...man.org, cminyard@...sta.com, dsingleton@...sta.com,
	dwalker@...sta.com, npiggin@...e.de, dsaxena@...xity.net,
	ak@...e.de, acme@...hat.com, gregkh@...e.de, sdietrich@...ell.com,
	pmorreale@...ell.com, mkohari@...ell.com
Subject: Re: [(RT RFC) PATCH v2 8/9] adjust pi_lock usage in wakeup

On Mon 2008-02-25 11:01:18, Gregory Haskins wrote:
> From: Peter W.Morreale <pmorreale@...ell.com>
> 
> In wakeup_next_waiter(), we take the pi_lock, and then find out whether
> we have another waiter to add to the pending owner.  We can reduce
> contention on the pi_lock for the pending owner if we first obtain the
> pointer to the next waiter outside of the pi_lock.
> 
> This patch adds a measureable increase in throughput.
> 
> Signed-off-by: Peter W. Morreale <pmorreale@...ell.com>

Missing sign-off.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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