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

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Message-ID: <i2s412e6f7f1004272322m125531cepdbddff2de596ab65@mail.gmail.com>
Date:	Wed, 28 Apr 2010 14:22:48 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	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>,
	David Howells <dhowells@...hat.com>,
	Takashi Iwai <tiwai@...e.de>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Changli Gao <xiaosuo@...il.com>
Subject: Re: [RFC] sched: implement the exclusive wait queue as a LIFO queue

On Wed, Apr 28, 2010 at 1:03 PM, Changli Gao <xiaosuo@...il.com> wrote:
>
>  static inline int waitqueue_active(wait_queue_head_t *q)
>  {
> -       return !list_empty(&q->task_list);
> +       return !list_empty(&q->task_list) || !list_empty(&q->task_list);
>  }
>

I am sorry. the later task_list should be task_list_ex. The updated
patch is attached. And I will replace task_list list with hlist for
saving space.

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

View attachment "wq-ex-lifo.diff" of type "text/plain" (5331 bytes)