linux-kernel - Re: [patch] CFS (Completely Fair Scheduler), v2

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Message-ID: <20070417085703.GA16645@elte.hu>
Date:	Tue, 17 Apr 2007 10:57:03 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	Gene Heskett <gene.heskett@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.org>,
	Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Williams <pwil3058@...pond.net.au>,
	Thomas Gleixner <tglx@...utronix.de>, caglar@...dus.org.tr,
	Willy Tarreau <w@....eu>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>
Subject: Re: [patch] CFS (Completely Fair Scheduler), v2


* Nick Piggin <npiggin@...e.de> wrote:

> >                   list_add_tail(&p->run_list, &current->run_list);
[...]
> > shouldnt the list_add_tail() be list_add(), so that task pickup sees 
> > the child first? [...]
[...]
> I think that it works because the list we're adding to is not the 
> normal runqueue list head, but the parent's list_head on that 
> runqueue. Which adds the child directly ahead of the parent... I 
> think?

yeah, you are right, i was confused: list_add() adds _after_ the head, 
list_add_tail() adds _before_ the head - and in the middle of the list 
if we do a list_add_tail() it adds before that entry. So everything's 
fine and working as expected :)

	Ingo
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