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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-01-16 22:29:10 +0100
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2012-02-21 18:03:49 +0100
commita858af2875fb291d0f4b0a4419fefbf03c2379c0 (patch)
tree5183796cbf50ec0cd3bd5c741db15705376dacbd /lib
parentrcu: Set RCU CPU stall times via sysfs (diff)
downloadlinux-a858af2875fb291d0f4b0a4419fefbf03c2379c0.tar.xz
linux-a858af2875fb291d0f4b0a4419fefbf03c2379c0.zip
rcu: Print scheduling-clock information on RCU CPU stall-warning messages
There have been situations where RCU CPU stall warnings were caused by issues in scheduling-clock timer initialization. To make it easier to track these down, this commit causes the RCU CPU stall-warning messages to print out the number of scheduling-clock interrupts taken in the current grace period for each stalled CPU. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug14
1 files changed, 14 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 3cc419d05f2f..d27a2aa3e815 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -927,6 +927,20 @@ config RCU_CPU_STALL_VERBOSE
Say Y if you want to enable such checks.
+config RCU_CPU_STALL_INFO
+ bool "Print additional diagnostics on RCU CPU stall"
+ depends on (TREE_RCU || TREE_PREEMPT_RCU) && DEBUG_KERNEL
+ default n
+ help
+ For each stalled CPU that is aware of the current RCU grace
+ period, print out additional per-CPU diagnostic information
+ regarding scheduling-clock ticks, idle state, and,
+ for RCU_FAST_NO_HZ kernels, idle-entry state.
+
+ Say N if you are unsure.
+
+ Say Y if you want to enable such diagnostics.
+
config RCU_TRACE
bool "Enable tracing for RCU"
depends on DEBUG_KERNEL