Date: Mon, 25 Feb 2008 23:10:33 +0100
From: Pavel Machek <pavel@ucw.cz>
To: Gregory Haskins <ghaskins@novell.com>
Cc: mingo@elte.hu, a.p.zijlstra@chello.nl, tglx@linutronix.de,
       rostedt@goodmis.org, linux-rt-users@vger.kernel.org,
       linux-kernel@vger.kernel.org, bill.huey@gmail.com, kevin@hilman.org,
       cminyard@mvista.com, dsingleton@mvista.com, dwalker@mvista.com,
       npiggin@suse.de, dsaxena@plexity.net, ak@suse.de, acme@redhat.com,
       gregkh@suse.de, sdietrich@novell.com, pmorreale@novell.com,
       mkohari@novell.com
Subject: Re: [(RT RFC) PATCH v2 8/9] adjust pi_lock usage in wakeup
Message-ID: <20080225221033.GJ2659@elf.ucw.cz>
References: <20080225155959.11268.35541.stgit@novell1.haskins.net> <20080225160118.11268.47575.stgit@novell1.haskins.net>
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On Mon 2008-02-25 11:01:18, Gregory Haskins wrote:
> From: Peter W.Morreale <pmorreale@novell.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@novell.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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