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Commit 007b0924 authored by Paul E. McKenney's avatar Paul E. McKenney Committed by Ingo Molnar
Browse files

rcu: Increase RCU CPU stall timeouts if PROVE_RCU 



CONFIG_PROVE_RCU imposes additional overhead on the kernel, so
increase the RCU CPU stall timeouts in an attempt to allow for
this effect.

Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: laijs@cn.fujitsu.com
Cc: dipankar@in.ibm.com
Cc: mathieu.desnoyers@polymtl.ca
Cc: josh@joshtriplett.org
Cc: dvhltc@us.ibm.com
Cc: niv@us.ibm.com
Cc: peterz@infradead.org
Cc: rostedt@goodmis.org
Cc: Valdis.Kletnieks@vt.edu
Cc: dhowells@redhat.com
LKML-Reference: <1267830207-9474-2-git-send-email-paulmck@linux.vnet.ibm.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 3f379b03

kernel/rcutree.h

+15 −6
Original line number Diff line number Diff line
@@ -246,8 +246,17 @@ struct rcu_data { 


#define RCU_JIFFIES_TILL_FORCE_QS	 3	/* for rsp->jiffies_force_qs */

#ifdef CONFIG_RCU_CPU_STALL_DETECTOR

#define RCU_SECONDS_TILL_STALL_CHECK   (10 * HZ)  /* for rsp->jiffies_stall */

#define RCU_SECONDS_TILL_STALL_RECHECK (30 * HZ)  /* for rsp->jiffies_stall */



#ifdef CONFIG_PROVE_RCU

#define RCU_STALL_DELAY_DELTA	       (5 * HZ)

#else

#define RCU_STALL_DELAY_DELTA	       0

#endif



#define RCU_SECONDS_TILL_STALL_CHECK   (10 * HZ + RCU_STALL_DELAY_DELTA)

						/* for rsp->jiffies_stall */

#define RCU_SECONDS_TILL_STALL_RECHECK (30 * HZ + RCU_STALL_DELAY_DELTA)

						/* for rsp->jiffies_stall */

#define RCU_STALL_RAT_DELAY		2	/* Allow other CPUs time */

						/*  to take at least one */

						/*  scheduling clock irq */