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rcu: Print scheduling-clock information on RCU CPU stall-warning messages

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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>
This commit is contained in:
Paul E. McKenney
2012-01-16 13:29:10 -08:00
committed by Paul E. McKenney
parent 13cfcca0e4
commit a858af2875
4 changed files with 194 additions and 14 deletions
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14
lib/Kconfig.debug
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@@ -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