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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-06-02 16:21:38 -0700
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2010-08-19 17:18:02 -0700
commitb163760e37047781b37c412cde54d146ac4b651f (patch)
tree5b447a210c81b78e20393472f4b53623c8fed28b
parent4221a9918e38b7494cee341dda7b7b4bb8c04bde (diff)
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rcu: make CPU stall warning timeout configurable
Also set the default to 60 seconds, up from the previous hard-coded timeout of 10 seconds. This allows people who care to set short timeouts, while avoiding people with unusual configurations (make randconfig!!!) from being bothered with spurious CPU stall warnings. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
-rw-r--r--kernel/rcutree.h5
-rw-r--r--lib/Kconfig.debug11
2 files changed, 14 insertions, 2 deletions
diff --git a/kernel/rcutree.h b/kernel/rcutree.h
index 5ce197e8779..183ebf40531 100644
--- a/kernel/rcutree.h
+++ b/kernel/rcutree.h
@@ -254,9 +254,10 @@ struct rcu_data {
#define RCU_STALL_DELAY_DELTA 0
#endif
-#define RCU_SECONDS_TILL_STALL_CHECK (10 * HZ + RCU_STALL_DELAY_DELTA)
+#define RCU_SECONDS_TILL_STALL_CHECK (CONFIG_RCU_CPU_STALL_TIMEOUT * HZ + \
+ RCU_STALL_DELAY_DELTA)
/* for rsp->jiffies_stall */
-#define RCU_SECONDS_TILL_STALL_RECHECK (30 * HZ + RCU_STALL_DELAY_DELTA)
+#define RCU_SECONDS_TILL_STALL_RECHECK (3 * RCU_SECONDS_TILL_STALL_CHECK + 30)
/* for rsp->jiffies_stall */
#define RCU_STALL_RAT_DELAY 2 /* Allow other CPUs time */
/* to take at least one */
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 12465f2ef76..b5005b76210 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -845,6 +845,17 @@ config RCU_CPU_STALL_DETECTOR
Say Y if you are unsure.
+config RCU_CPU_STALL_TIMEOUT
+ int "RCU CPU stall timeout in seconds"
+ depends on RCU_CPU_STALL_DETECTOR
+ range 3 300
+ default 60
+ help
+ If a given RCU grace period extends more than the specified
+ number of seconds, a CPU stall warning is printed. If the
+ RCU grace period persists, additional CPU stall warnings are
+ printed at more widely spaced intervals.
+
config RCU_CPU_STALL_VERBOSE
bool "Print additional per-task information for RCU_CPU_STALL_DETECTOR"
depends on RCU_CPU_STALL_DETECTOR && TREE_PREEMPT_RCU