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

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Message-ID: <q2j412e6f7f1004280052ice434710ra17a4516236bd3f3@mail.gmail.com>
Date:	Wed, 28 Apr 2010 15:52:01 +0800
From:	Changli Gao <xiaosuo@...il.com>
To:	Xiaotian Feng <xtfeng@...il.com>
Cc:	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 3:47 PM, Xiaotian Feng <xtfeng@...il.com> wrote:
> On Wed, Apr 28, 2010 at 1:03 PM, Changli Gao <xiaosuo@...il.com> wrote:
>> implement the exclusive wait queue as a LIFO queue
>>
>> If the exclusive wait queue is also a LIFO queue as the normal wait queue, the
>> process who goes to sleep recently, will be woke up first. As its memory is
>> more likely in cache, we will get better performance. And when there are many
>> processes waiting on a exclusive wait queue, some of them may not be woke up,
>> if the others can handle the workload, and it will reduce the load of
>> the scheduler.
>>
>
> Starve some processes for performance?
>

Starve? Oh, No. If we don't need these processes, and we can do better
without them, why we wake them up?


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