linux-kernel - Re: [patch] CFS scheduler, -v6

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Message-ID: <20070428135338.GA8207@elte.hu>
Date:	Sat, 28 Apr 2007 15:53:38 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Srivatsa Vaddagiri <vatsa@...ibm.com>
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>,
	Peter Williams <pwil3058@...pond.net.au>,
	Thomas Gleixner <tglx@...utronix.de>, caglar@...dus.org.tr,
	Willy Tarreau <w@....eu>,
	Gene Heskett <gene.heskett@...il.com>, Mark Lord <lkml@....ca>,
	Zach Carter <linux@...hcarter.com>,
	buddabrod <buddabrod@...il.com>
Subject: Re: [patch] CFS scheduler, -v6


* Srivatsa Vaddagiri <vatsa@...ibm.com> wrote:

> On Wed, Apr 25, 2007 at 11:47:04PM +0200, Ingo Molnar wrote:
> > The CFS patch against v2.6.21-rc7 or against v2.6.20.7 can be downloaded 
> > from the usual place:
> > 
> >     http://redhat.com/~mingo/cfs-scheduler/
> 
> +static inline struct rb_node * first_fair(struct rq *rq)
> +{
> +	if (rq->rb_leftmost)
> +		return rq->rb_leftmost;
> +	return rb_first(&rq->tasks_timeline);
> +}
> 
> Won't it help if you update rq->rb_leftmost above from the value 
> returned by rb_first(), so that subsequent calls to first_fair will be 
> sped up?

yeah, indeed. Would you like to do a patch for that?

	Ingo
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