Re: preemptible RCU bug (was Re: [git pull] scheduler changes for v2.6.25)

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To: Stefan Richter <stefanr@...>
Cc: Ingo Molnar <mingo@...>, <linux-kernel@...>
Date: Sunday, January 27, 2008 - 7:05 am

On Sat, Jan 26, 2008 at 08:19:21PM +0100, Stefan Richter wrote:

Good catch!!!

This patch supplies help text for the "RCU implementation type"
kernel configuration choice.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
---

 Kconfig.preempt |    8 ++++++++
 1 file changed, 8 insertions(+)

diff -urpNa -X dontdiff linux-2.6.24-rt1/kernel/Kconfig.preempt linux-2.6.24-rt1-RCUconfighelp/kernel/Kconfig.preempt
--- linux-2.6.24-rt1/kernel/Kconfig.preempt	2008-01-27 02:52:36.000000000 -0800
+++ linux-2.6.24-rt1-RCUconfighelp/kernel/Kconfig.preempt	2008-01-27 03:05:22.000000000 -0800
@@ -131,6 +131,14 @@ choice
 	prompt "RCU implementation type:"
 	default PREEMPT_RCU if PREEMPT_RT
 	default CLASSIC_RCU
+	help
+	  This allows you to choose either the classic RCU implementation
+	  that is designed for best read-side performance on non-realtime
+	  systems, or the preemptible RCU implementation for best latency
+	  on realtime systems.  Note that some kernel preemption modes
+	  will restrict your choice.
+
+	  Select the default if you are unsure.
 
 config CLASSIC_RCU
 	bool "Classic RCU"
--
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Messages in current thread:
[git pull] scheduler changes for v2.6.25, Ingo Molnar, (Fri Jan 25, 4:37 pm)
Re: preemptible RCU bug (was Re: [git pull] scheduler change..., Paul E. McKenney, (Sun Jan 27, 7:05 am)