linux-kernel - [PATCH tip/core/rcu 4/4] rcu: make RCU's CPU-stall detector be default

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Message-Id: <12597846162906-git-send-email->
Date:	Wed,  2 Dec 2009 12:10:16 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	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, dvhltc@...ibm.com, niv@...ibm.com,
	tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH tip/core/rcu 4/4] rcu: make RCU's CPU-stall detector be default

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

The RCU_CPU_STALL_DETECTOR costs almost nothing and has located some bugs
that might otherwise have been difficult to track down.  Make it be default
for the TREE RCU implementations.  (TINY_RCU does not support CPU-stall
detection, but then again it is a uniprocessor...)

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 lib/Kconfig.debug |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 8911558..50e0e78 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -749,7 +749,7 @@ config RCU_TORTURE_TEST_RUNNABLE
 config RCU_CPU_STALL_DETECTOR
 	bool "Check for stalled CPUs delaying RCU grace periods"
 	depends on TREE_RCU || TREE_PREEMPT_RCU
-	default n
+	default y
 	help
 	  This option causes RCU to printk information on which
 	  CPUs are delaying the current grace period, but only when
-- 
1.5.2.5

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