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From: Changli Gao <xiaosuo@gmail.com>
Date: Wed, 28 Apr 2010 23:33:37 +0800
Message-ID: <p2w412e6f7f1004280833y4bdbcc6s6d99f2b6283a283@mail.gmail.com>
Subject: Re: [RFC] sched: implement the exclusive wait queue as a LIFO queue
To: David Howells <dhowells@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>, Alexander Viro <viro@zeniv.linux.org.uk>,
       Andrew Morton <akpm@linux-foundation.org>,
       "Eric W. Biederman" <ebiederm@xmission.com>,
       Davide Libenzi <davidel@xmailserver.org>,
       Roland Dreier <rolandd@cisco.com>,
       Stefan Richter <stefanr@s5r6.in-berlin.de>,
       Peter Zijlstra <a.p.zijlstra@chello.nl>,
       "David S. Miller" <davem@davemloft.net>,
       Eric Dumazet <dada1@cosmosbay.com>, Christoph Lameter <cl@linux.com>,
       Andreas Herrmann <andreas.herrmann3@amd.com>,
       Thomas Gleixner <tglx@linutronix.de>, Takashi Iwai <tiwai@suse.de>,
       linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
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On Wed, Apr 28, 2010 at 11:00 PM, David Howells <dhowells@redhat.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@gmail.com)
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