linux-kernel - Re: rcu self-detected stall messages on OMAP3, 4 boards

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Date:	Fri, 21 Sep 2012 18:59:58 +0000 (UTC)
From:	Paul Walmsley <paul@...an.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
cc:	"Bruce, Becky" <bbruce@...com>,
	"Paul E. McKenney" <paul.mckenney@...aro.org>,
	"<linux-kernel@...r.kernel.org>" <linux-kernel@...r.kernel.org>,
	"<linux-omap@...r.kernel.org>" <linux-omap@...r.kernel.org>,
	"<linux-arm-kernel@...ts.infradead.org>" 
	<linux-arm-kernel@...ts.infradead.org>,
	"Hilman, Kevin" <khilman@...com>,
	"Shilimkar, Santosh" <santosh.shilimkar@...com>,
	"Hunter, Jon" <jon-hunter@...com>,
	"<snijsure@...d-net.com>" <snijsure@...d-net.com>,
	fweisbec@...il.com
Subject: Re: rcu self-detected stall messages on OMAP3, 4 boards

Hi

Just did a test with CONFIG_NO_HZ=n, and no rcu_sched stall messages 
appeared for 60 minutes.

Following is the diff from omap2plus_defconfig.

- Paul

--- .config	2012-09-21 12:51:19.114938954 -0600
+++ .testconfig	2012-09-21 12:51:15.686926318 -0600
@@ -69,7 +69,7 @@
 # Timers subsystem
 #
 CONFIG_TICK_ONESHOT=y
-CONFIG_NO_HZ=y
+# CONFIG_NO_HZ is not set
 CONFIG_HIGH_RES_TIMERS=y
 
 #
@@ -80,7 +80,6 @@
 CONFIG_RCU_FANOUT=32
 CONFIG_RCU_FANOUT_LEAF=16
 # CONFIG_RCU_FANOUT_EXACT is not set
-# CONFIG_RCU_FAST_NO_HZ is not set
 # CONFIG_TREE_RCU_TRACE is not set
 CONFIG_IKCONFIG=y
 CONFIG_IKCONFIG_PROC=y
@@ -2535,7 +2534,7 @@
 # CONFIG_BOOT_PRINTK_DELAY is not set
 # CONFIG_RCU_TORTURE_TEST is not set
 CONFIG_RCU_CPU_STALL_TIMEOUT=60
-# CONFIG_RCU_CPU_STALL_INFO is not set
+CONFIG_RCU_CPU_STALL_INFO=y
 # CONFIG_RCU_TRACE is not set
 # CONFIG_KPROBES_SANITY_TEST is not set
 # CONFIG_BACKTRACE_SELF_TEST is not set

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