linux-kernel - Re: [patch] CFS scheduler, v3

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Message-ID: <20070418212645.GU2986@holomorphy.com>
Date:	Wed, 18 Apr 2007 14:26:45 -0700
From:	William Lee Irwin III <wli@...omorphy.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>
Subject: Re: [patch] CFS scheduler, v3

On Wed, Apr 18, 2007 at 07:50:17PM +0200, Ingo Molnar wrote:
> this is the third release of the CFS patchset (against v2.6.21-rc7), and 
> can be downloaded from:
>    http://redhat.com/~mingo/cfs-scheduler/
> this is a pure "fix reported regressions" release so there's much less 
> churn:
>    5 files changed, 71 insertions(+), 29 deletions(-)
> (the added lines are mostly debug related, not genuine increase in the 
> scheduler's size)

It appears to me that the following can be taken in for mainline
(or rejected for mainline) independently of the rest of the cfs patch.


-- wli

Mark the runqueues ____cacheline_aligned_in_smp to avoid false sharing.

Index: sched/kernel/sched.c
===================================================================
--- sched.orig/kernel/sched.c	2007-04-18 14:10:03.593207728 -0700
+++ sched/kernel/sched.c	2007-04-18 14:11:39.270660075 -0700
@@ -278,7 +278,7 @@
 	struct lock_class_key rq_lock_key;
 };
 
-static DEFINE_PER_CPU(struct rq, runqueues);
+static DEFINE_PER_CPU(struct rq, runqueues) ____cacheline_aligned_in_smp;
 
 static inline int cpu_of(struct rq *rq)
 {
-
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