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Date: Mon, 30 Oct 2000 14:36:39 -0200 (BRDT)
From: Rik van Riel <riel@conectiva.com.br>
To: Andrea Arcangeli <andrea@suse.de>
cc: Andi Kleen <ak@suse.de>, dean gaudet <dean-list-linux-kernel@arctic.org>,
        Alan Cox <alan@lxorguk.ukuu.org.uk>,
        Andrew Morton <andrewm@uow.edu.au>, kumon@flab.fujitsu.co.jp,
        Alexander Viro <viro@math.psu.edu>,
        "Jeff V. Merkey" <jmerkey@timpanogas.org>,
        linux-kernel@vger.kernel.org, Olaf Kirch <okir@monad.swb.de>
Subject: Re: [PATCH] Re: Negative scalability by removal of lock_kernel()?(Was:
In-Reply-To: <20001030162815.B21935@athlon.random>
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On Mon, 30 Oct 2000, Andrea Arcangeli wrote:
> On Mon, Oct 30, 2000 at 07:29:51AM +0100, Andi Kleen wrote:
> > It should not be needed anymore for 2.4, because the accept() wakeup has been
> > fixed.
> 
> Certainly sleeping in accept will be just way better than file any locking.
> 
> OTOH accept() is still _wrong_ as it wake-one FIFO while it
> should wake-one LIFO (so that we optimize the cache usage skip
> TLB flushes and allow the redundand tasks to be paged out). I
> can only see cons in doing FIFO wake-one.

LIFO wakeup is indeed the way to go for things like accept().

For stuff like ___wait_on_page(), OTOH, you really want FIFO
wakeup to avoid starvation (yes, I know we're currently doing
wake_all in ___wait_on_page ;))...

regards,

Rik
--
"What you're running that piece of shit Gnome?!?!"
       -- Miguel de Icaza, UKUUG 2000

http://www.conectiva.com/		http://www.surriel.com/

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