netdev - [PATCH net-next] inet: add a schedule point in inet_twsk

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Message-ID: <1426725651.25985.5.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 18 Mar 2015 17:40:51 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev <netdev@...r.kernel.org>
Subject: [PATCH net-next] inet: add a schedule point in inet_twsk_purge()

From: Eric Dumazet <edumazet@...gle.com>

On a large hash table, we can easily spend seconds to
walk over all entries. Add a cond_resched() to yield
cpu if necessary.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 net/ipv4/inet_timewait_sock.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
index 86ebf020925bd0944e05b912f31e6d694d4c0219..f38e387448fb5596c64cdcb07e7cb06d3e624451 100644
--- a/net/ipv4/inet_timewait_sock.c
+++ b/net/ipv4/inet_timewait_sock.c
@@ -487,6 +487,7 @@ void inet_twsk_purge(struct inet_hashinfo *hashinfo,
 	for (slot = 0; slot <= hashinfo->ehash_mask; slot++) {
 		struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
 restart_rcu:
+		cond_resched();
 		rcu_read_lock();
 restart:
 		sk_nulls_for_each_rcu(sk, node, &head->chain) {


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