netdev - Re: Scalability of interface creation and deletion

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Message-ID: <1304793553.3207.24.camel@edumazet-laptop>
Date:	Sat, 07 May 2011 20:39:13 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alex Bligh <alex@...x.org.uk>
Cc:	netdev@...r.kernel.org
Subject: Re: Scalability of interface creation and deletion

Le samedi 07 mai 2011 à 20:32 +0200, Eric Dumazet a écrit :

Also you could patch synchronize_sched() itself instead of
synchronize_net()

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index dd4aea8..4af6e10 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -1518,6 +1518,7 @@ EXPORT_SYMBOL_GPL(call_rcu_bh);
 void synchronize_sched(void)
 {
 	struct rcu_synchronize rcu;
+	ktime_t time_start = ktime_get();
 
 	if (rcu_blocking_is_gp())
 		return;
@@ -1529,6 +1530,7 @@ void synchronize_sched(void)
 	/* Wait for it. */
 	wait_for_completion(&rcu.completion);
 	destroy_rcu_head_on_stack(&rcu.head);
+	pr_err("synchronize_rcu() in %lld us\n", ktime_us_delta(ktime_get(), time_start));
 }
 EXPORT_SYMBOL_GPL(synchronize_sched);
 


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