From: Andi Kleen <andi@firstfloor.org>
To: paulmck@linux.vnet.ibm.com
Cc: linux-kernel@vger.kernel.org, mingo@elte.hu,
laijs@cn.fujitsu.com, dipankar@in.ibm.com,
akpm@linux-foundation.org, mathieu.desnoyers@polymtl.ca,
josh@joshtriplett.org, dvhltc@us.ibm.com, niv@us.ibm.com,
tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org,
Valdis.Kletnieks@vt.edu, dhowells@redhat.com
Subject: Re: [PATCH RFC tip/core/rcu] accelerate grace period if last non-dynticked CPU
Date: Tue, 26 Jan 2010 22:30:57 +0100 [thread overview]
Message-ID: <873a1sft9q.fsf@basil.nowhere.org> (raw)
In-Reply-To: <20100125034816.GA14043@linux.vnet.ibm.com> (Paul E. McKenney's message of "Sun, 24 Jan 2010 19:48:16 -0800")
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com> writes:
Kind of offtopic to the original patch, but I couldn't
resist...
> +config RCU_FAST_NO_HZ
> + bool "Accelerate last non-dyntick-idle CPU's grace periods"
> + depends on TREE_RCU && NO_HZ && SMP
Having such a thing as a config option doesn't really make
any sense to me. Who would want to recompile their kernel
to enable/disable this? If anything it should be runtime, or better
just unconditionally on.
In general RCU could probably reduce its number of "weird"
Kconfig options.
While I think I have a better understanding of RCU than a lot
of normal users I often have no clue what to set there when
building a kernel.
-Andi
--
ak@linux.intel.com -- Speaking for myself only.
next prev parent reply other threads:[~2010-01-26 21:31 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-25 3:48 [PATCH RFC tip/core/rcu] accelerate grace period if last non-dynticked CPU Paul E. McKenney
2010-01-25 12:28 ` Lai Jiangshan
2010-01-25 12:35 ` Peter Zijlstra
2010-01-25 15:08 ` Steven Rostedt
2010-01-27 5:17 ` Paul E. McKenney
2010-01-25 15:12 ` Steven Rostedt
2010-01-27 14:11 ` Paul E. McKenney
2010-01-27 14:52 ` Steven Rostedt
2010-01-26 21:30 ` Andi Kleen [this message]
2010-01-26 23:55 ` Mathieu Desnoyers
2010-01-27 5:21 ` Paul E. McKenney
2010-01-27 5:20 ` Paul E. McKenney
2010-01-27 9:43 ` Andi Kleen
2010-01-27 9:50 ` Peter Zijlstra
2010-01-27 10:00 ` Andi Kleen
2010-01-27 10:04 ` Paul E. McKenney
2010-01-27 11:39 ` Nick Piggin
2010-01-27 11:59 ` Paul E. McKenney
2010-01-27 10:01 ` Paul E. McKenney
2010-01-27 10:13 ` Andi Kleen
2010-01-27 11:44 ` Paul E. McKenney
2010-01-27 12:11 ` Andi Kleen
2010-01-27 13:23 ` Paul E. McKenney
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