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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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