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From: David Howells <dhowells@redhat.com>
To: Changli Gao <xiaosuo@gmail.com>
Cc: dhowells@redhat.com, Yong Zhang <yong.zhang@windriver.com>,
	Xiaotian Feng <xtfeng@gmail.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
Subject: Re: [RFC] sched: implement the exclusive wait queue as a LIFO queue
Date: Wed, 28 Apr 2010 14:21:02 +0100	[thread overview]
Message-ID: <12671.1272460862@redhat.com> (raw)
In-Reply-To: <q2m412e6f7f1004280417h449c67f9g86fca3dbece106e3@mail.gmail.com>

Changli Gao <xiaosuo@gmail.com> wrote:

> You are right. I made the wrong assumption. But we indeed need some
> primitive to add wait_queue at the head of the wait_queue_head, and I
> know epoll needs it, at least.
> 
> fs/eventpoll.c: 1443.
>                 wait.flags |= WQ_FLAG_EXCLUSIVE;
>                 __add_wait_queue(&ep->wq, &wait);

You can add at either end of the wait queue with __add_wait_queue() and
__add_wait_queue_tail().

David

  reply	other threads:[~2010-04-28 13:22 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-04-28  5:03 [RFC] sched: implement the exclusive wait queue as a LIFO queue Changli Gao
2010-04-28  6:22 ` Changli Gao
2010-04-28  8:05   ` Changli Gao
2010-04-28  7:47 ` Xiaotian Feng
2010-04-28  7:47   ` Xiaotian Feng
2010-04-28  7:52   ` Changli Gao
2010-04-28  7:52     ` Changli Gao
2010-04-28  8:15     ` Yong Zhang
2010-04-28  8:15       ` Yong Zhang
2010-04-28  8:23       ` Changli Gao
2010-04-28  9:25         ` Johannes Weiner
2010-04-28  9:29         ` David Howells
2010-04-28 11:17           ` Changli Gao
2010-04-28 11:17             ` Changli Gao
2010-04-28 13:21             ` David Howells [this message]
2010-04-28 13:21             ` Jamie Lokier
2010-04-28 13:21               ` Jamie Lokier
2010-04-28 13:42               ` Changli Gao
2010-04-28 15:25                 ` Jamie Lokier
2010-04-28 15:49                   ` Changli Gao
2010-04-28 18:57             ` Davide Libenzi
2010-04-28  9:32 ` David Howells
2010-04-28 13:56   ` Changli Gao
2010-04-28 13:56     ` Changli Gao
2010-04-28 14:06     ` David Howells
2010-04-28 14:53       ` Changli Gao
2010-04-28 14:53         ` Changli Gao
2010-04-28 15:00         ` David Howells
2010-04-28 15:33           ` Changli Gao
2010-04-28 15:33             ` Changli Gao
2010-04-28  9:34 ` David Howells
2010-04-28 13:47   ` Changli Gao

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