linux-kernel - Re: [PATCH tip/core/rcu 01/22] rcu: Control RCU_FANOUT

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Message-ID: <87y5n4xatd.fsf@rustcorp.com.au>
Date:	Sun, 01 Jul 2012 15:49:42 +0930
From:	Rusty Russell <rusty@...abs.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Cc:	mingo@...e.hu, laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...ymtl.ca,
	josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, Valdis.Kletnieks@...edu,
	dhowells@...hat.com, eric.dumazet@...il.com, darren@...art.com,
	fweisbec@...il.com, sbw@....edu, patches@...aro.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH tip/core/rcu 01/22] rcu: Control RCU_FANOUT_LEAF from boot-time parameter

On Fri, 22 Jun 2012 08:17:00 -0700, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:
> From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> 
> Although making RCU_FANOUT_LEAF a kernel configuration parameter rather
> than a fixed constant makes it easier for people to decrease cache-miss
> overhead for large systems, it is of little help for people who must
> run a single pre-built kernel binary.
> 
> This commit therefore allows the value of RCU_FANOUT_LEAF to be
> increased (but not decreased!) via a boot-time parameter named
> rcutree.rcu_fanout_leaf.
...
> +static int rcu_fanout_leaf = CONFIG_RCU_FANOUT_LEAF;
> +module_param(rcu_fanout_leaf, int, 0);

Maybe it's overkill, but 0400 or 0444 might be a nice touch.

Cheers,
Rusty.
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