From: Ingo Molnar <mingo@elte.hu>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: linux-kernel@vger.kernel.org, tglx@linutronix.de,
akpm@linux-foundation.org, ralf@linux-mips.org,
kernel@wantstofly.org, hskinnemoen@atmel.com,
cooloney@kernel.org, tony.luck@intel.com, geert@linux-m68k.org,
zippel@linux-m68k.org, jwboyer@linux.vnet.ibm.com,
mporter@kernel.crashing.org, grant.likely@secretlab.ca,
paulus@samba.org, benh@kernel.crashing.org, dhowells@redhat.com,
yasutake.koichi@jp.panasonic.com, lethal@linux-sh.org,
hpa@zytor.com
Subject: Re: [PATCH, -tip] Make hierarchical RCU be the default
Date: Sat, 27 Dec 2008 11:35:01 +0100 [thread overview]
Message-ID: <20081227103501.GG14639@elte.hu> (raw)
In-Reply-To: <20081223220648.GB16472@linux.vnet.ibm.com>
* Paul E. McKenney <paulmck@linux.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
next prev parent reply other threads:[~2008-12-27 10:36 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-23 0:12 [PATCH -tip] Change default from CLASSIC_RCU to TREE_RCU (testing only) paulmck
2008-12-23 0:12 ` [PATCH -tip] Set the default RCU to be rcutree paulmck
2008-12-23 0:12 ` [PATCH -tip] Switch arm defconfig files from CONFIG_CLASSIC_RCU to CONFIG_TREE_RCU paulmck
2008-12-23 14:25 ` Ingo Molnar
2008-12-23 21:59 ` Paul E. McKenney
2008-12-23 22:03 ` [PATCH, -tip] Remove redundant RCU_CPU_STALL_DETECTOR declaration Paul E. McKenney
2008-12-23 22:06 ` [PATCH, -tip] Make hierarchical RCU be the default Paul E. McKenney
2008-12-27 10:35 ` Ingo Molnar [this message]
2008-12-27 23:27 ` Paul E. McKenney
2008-12-27 23:39 ` Paul E. McKenney
2008-12-29 3:22 ` [PATCH, -tip] v2 " Paul E. McKenney
2008-12-25 8:36 ` [PATCH -tip] Switch arm defconfig files from CONFIG_CLASSIC_RCU to CONFIG_TREE_RCU Ingo Molnar
2008-12-25 9:33 ` Sam Ravnborg
2008-12-25 19:23 ` Paul E. McKenney
2008-12-26 18:35 ` Sam Ravnborg
2008-12-26 14:22 ` Ingo Molnar
2008-12-25 18:46 ` Paul E. McKenney
2008-12-23 0:12 ` [PATCH -tip] Switch avr32 defconfigs " paulmck
2008-12-23 0:12 ` [PATCH -tip] Switch blackfin defconfig " paulmck
2008-12-23 0:12 ` [PATCH -tip] Switch ia64 " paulmck
2008-12-23 0:12 ` [PATCH -tip] Switch m68k " paulmck
2008-12-23 0:12 ` [PATCH -tip] Switch m68knommu " paulmck
2008-12-23 0:12 ` [PATCH -tip] Switch mips defconfig " paulmck
2008-12-23 0:12 ` [PATCH -tip] Switch mn10300 " paulmck
2008-12-23 0:12 ` [PATCH -tip] Switch powerpc " paulmck
2008-12-23 0:12 ` [PATCH -tip] Switch sh " paulmck
2008-12-23 0:12 ` [PATCH -tip] Switch x86 " paulmck
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