linux-kernel - Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

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Message-Id: <1176502546.3129.79.camel@imap.mvista.com>
Date:	Fri, 13 Apr 2007 15:15:46 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Con Kolivas <kernel@...ivas.org>,
	Nick Piggin <npiggin@...e.de>, Mike Galbraith <efault@....de>,
	Arjan van de Ven <arjan@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair
	Scheduler [CFS]

On Fri, 2007-04-13 at 22:21 +0200, Ingo Molnar wrote:
> [announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
> 
> i'm pleased to announce the first release of the "Modular Scheduler Core
> and Completely Fair Scheduler [CFS]" patchset:
> 
>    http://redhat.com/~mingo/cfs-scheduler/sched-modular+cfs.patch
> 
> This project is a complete rewrite of the Linux task scheduler. My goal
> is to address various feature requests and to fix deficiencies in the
> vanilla scheduler that were suggested/found in the past few years, both
> for desktop scheduling and for server scheduling workloads.

I'm not in love with the current or other schedulers, so I'm indifferent
to this change. However, I was reviewing your release notes and the
patch and found myself wonder what the logarithmic complexity of this
new scheduler is .. I assumed it would also be constant time , but the
__enqueue_task_fair doesn't appear to be constant time (rbtree insert
complexity).. Maybe that's not a critical path , but I thought I would
at least comment on it.

Daniel

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