linux-kernel - Re: [RFC] sched: implement the exclusive wait queue as a LIFO queue

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Message-ID: <p2w412e6f7f1004280833y4bdbcc6s6d99f2b6283a283@mail.gmail.com>
Date:	Wed, 28 Apr 2010 23:33:37 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	David Howells <dhowells@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Roland Dreier <rolandd@...co.com>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <dada1@...mosbay.com>,
	Christoph Lameter <cl@...ux.com>,
	Andreas Herrmann <andreas.herrmann3@....com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Takashi Iwai <tiwai@...e.de>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] sched: implement the exclusive wait queue as a LIFO queue

On Wed, Apr 28, 2010 at 11:00 PM, David Howells <dhowells@...hat.com> wrote:
>
> But is it actually used in both modes at the same time?
>

It should be seldom in good applications. So I only need to add a
function, like this:

add_wait_queue_head_exclusive(wq, wait)
   first_exclusive = find_the_first_exclusive(wq); // it is fast, as
there should no or few non-exclusive wait queues
   list_add(wait, first_exclusive);


-- 
Regards，
Changli Gao(xiaosuo@...il.com)
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