From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Howells <dhowells@redhat.com>
Subject: Re: [RFC] sched: implement the exclusive wait queue as a LIFO queue
Date: Wed, 28 Apr 2010 10:32:02 +0100
Message-ID: <8526.1272447122@redhat.com>
References: <1272430986-20436-1-git-send-email-xiaosuo@gmail.com>
Cc: dhowells@redhat.com, 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
To: Changli Gao <xiaosuo@gmail.com>
Return-path: <linux-kernel-owner@vger.kernel.org>
In-Reply-To: <1272430986-20436-1-git-send-email-xiaosuo@gmail.com>
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List-Id: linux-fsdevel.vger.kernel.org

Changli Gao <xiaosuo@gmail.com> wrote:

> @@ -50,6 +48,7 @@ struct wait_bit_queue {
>  struct __wait_queue_head {
>  	spinlock_t lock;
>  	struct list_head task_list;
> +	struct list_head task_list_ex;

It would be preferable it if you could avoid making struct __wait_queue_head
bigger.  That will increase the size of a lot of things.

David