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

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Date:	Wed, 28 Apr 2010 16:23:52 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Yong Zhang <yong.zhang@...driver.com>
Cc:	Xiaotian Feng <xtfeng@...il.com>, 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>,
	David Howells <dhowells@...hat.com>,
	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 4:15 PM, Yong Zhang <yong.zhang@...driver.com> wrote:
>
> What do you mean "we don't need these processes"?

If the work is less than the workers, we don't need the workers at the
tail of the exculsive list.

>
>> without them, why we wake them up?
>
> So some processs(at the tail of exclusive list)will be treated abnormally
> and it will sleep for a long time, is this reasonable?
>

If there isn't enough work to be done, we'd better not disrupt them
and  leave them sleeping forever to keep the scheduler happier. Do we
have reason to keep fair to all the workers? Does it have benefit?

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