This is intended for use in loops which read data protected by RCU and may have a large number of iterations. Such an example is dumping the list of connections known to IPVS: ip_vs_conn_array() and ip_vs_conn_seq_next(). The call to cond_resched() is guarded by #ifndef CONFIG_PREEMPT_RCU as in the case of CONFIG_PREEMPT_RCU _rcu_read_unlock() will check to see if the RCU core needs to be informed, so there is no need to invoke cond_resched() in that case. Thanks to Paul E. McKenney for explaining this. cond_resched_rcu_lock() suggested by Eric Dumazet. ifndef guard suggested by Paul E. McKenney and Julian Anastasov. Cc: Eric Dumazet <eric.dumazet@xxxxxxxxx> Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> Cc: Julian Anastasov <ja@xxxxxx> Acked-by: Ingo Molnar <mingo@xxxxxxxxxx> Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx> --- v2 * Add guard the call to cond_resched() --- include/linux/sched.h | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/include/linux/sched.h b/include/linux/sched.h index e692a02..66da71c 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2787,3 +2787,14 @@ static inline unsigned long rlimit_max(unsigned int limit) } #endif + +static void inline cond_resched_rcu_lock(void) +{ + if (need_resched()) { + rcu_read_unlock(); +#ifndef CONFIG_PREEMPT_RCU + cond_resched(); +#endif + rcu_read_lock(); + } +} -- 1.8.2.1 -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html