[PATCH 1/2] sched: Add cond_resched_rcu_lock() helper

To: Eric Dumazet <eric.dumazet@xxxxxxxxx>, Julian Anastasov <ja@xxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Subject: [PATCH 1/2] sched: Add cond_resched_rcu_lock() helper
Cc: lvs-devel@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, netfilter-devel@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>, Dipankar Sarma <dipankar@xxxxxxxxxx>, "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, Simon Horman <horms@xxxxxxxxxxxx>
From: Simon Horman <horms@xxxxxxxxxxxx>
Date: Fri, 26 Apr 2013 10:45:07 +0900
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().

As suggested by Eric Dumazet.

Cc: Eric Dumazet <eric.dumazet@xxxxxxxxx>
Cc: Julian Anastasov <ja@xxxxxx>
Signed-off-by: Simon Horman <horms@xxxxxxxxxxxx>
 include/linux/sched.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index e692a02..7eec4c7 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2787,3 +2787,12 @@ static inline unsigned long rlimit_max(unsigned int 
+static void inline cond_resched_rcu_lock(void)
+       if (need_resched()) {
+               rcu_read_unlock();
+               cond_resched();
+               rcu_read_lock();
+       }

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