linux-kernel - [PATCH 1/2] sched: Add cond_resched_rcu

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Message-Id: <1366940708-10180-2-git-send-email-horms@verge.net.au>
Date:	Fri, 26 Apr 2013 10:45:07 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	Julian Anastasov <ja@....bg>, Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	lvs-devel@...r.kernel.org, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Dipankar Sarma <dipankar@...ibm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Simon Horman <horms@...ge.net.au>
Subject: [PATCH 1/2] sched: Add cond_resched_rcu_lock() helper

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@...il.com>
Cc: Julian Anastasov <ja@....bg>
Signed-off-by: Simon Horman <horms@...ge.net.au>
---
 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 limit)
 }
 
 #endif
+
+static void inline cond_resched_rcu_lock(void)
+{
+	if (need_resched()) {
+		rcu_read_unlock();
+		cond_resched();
+		rcu_read_lock();
+	}
+}
-- 
1.8.2.1

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