linux-kernel - Re: [PATCH, -tip] Make hierarchical RCU be the default

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Message-ID: <20081227103501.GG14639@elte.hu>
Date:	Sat, 27 Dec 2008 11:35:01 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, ralf@...ux-mips.org,
	kernel@...tstofly.org, hskinnemoen@...el.com, cooloney@...nel.org,
	tony.luck@...el.com, geert@...ux-m68k.org, zippel@...ux-m68k.org,
	jwboyer@...ux.vnet.ibm.com, mporter@...nel.crashing.org,
	grant.likely@...retlab.ca, paulus@...ba.org,
	benh@...nel.crashing.org, dhowells@...hat.com,
	yasutake.koichi@...panasonic.com, lethal@...ux-sh.org,
	hpa@...or.com
Subject: Re: [PATCH, -tip] Make hierarchical RCU be the default


* Paul E. McKenney <paulmck@...ux.vnet.ibm.com> wrote:

> --- a/include/linux/hardirq.h
> +++ b/include/linux/hardirq.h
> @@ -118,7 +118,7 @@ static inline void account_system_vtime(struct task_struct *tsk)
>  }
>  #endif
>  
> -#if defined(CONFIG_NO_HZ) && !defined(CONFIG_CLASSIC_RCU)
> +#if defined(CONFIG_NO_HZ) && !defined(CONFIG_FLAT_RCU)

this can be done in an even lazier fashion, via a ~5 lines patch.

Just add FLAT_RCU as the new kconfig method, and make CONFIG_CLASSIC_RCU 
mirror it via something like:

  config CLASSIC_RCU
  bool
  default FLAT_RCU

that makes your patch only affect the Kconfig file - and makes it easily 
revertable, etc.

	Ingo
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