From: Eric Dumazet <edumazet@google.com>
Date: Thu, 19 Mar 2015 00:40:51 +0000 (-0700)
Subject: inet: add a schedule point in inet_twsk_purge()
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=738e6d30d392fb75933a5eb4b481811598038786;p=deliverable%2Flinux.git

inet: add a schedule point in inet_twsk_purge()

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@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/inet_timewait_sock.c b/net/ipv4/inet_timewait_sock.c
index 86ebf020925b..f38e387448fb 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) {