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

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Message-ID: <20070428124516.GA27292@in.ibm.com>
Date:	Sat, 28 Apr 2007 18:15:16 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.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>,
	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

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?

-- 
Regards,
vatsa
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