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Commit b163760e authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

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: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: default avatarJosh Triplett <josh@joshtriplett.org>
parent 4221a991

kernel/rcutree.h

+3 −2
Original line number Diff line number Diff line
@@ -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 */

lib/Kconfig.debug

+11 −0
Original line number Diff line number Diff line
@@ -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