linux-kernel - [PATCH 2/6] netprio_cgroup: don't allocate prio table when a device is registered

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Message-ID: <4F28E1E3.80507@cn.fujitsu.com>
Date:	Wed, 01 Feb 2012 14:55:31 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	David Miller <davem@...emloft.net>
CC:	netdev <netdev@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>,
	Neil Horman <nhorman@...driver.com>
Subject: [PATCH 2/6] netprio_cgroup: don't allocate prio table when a device
 is registered

So we delay the allocation till the priority is set through cgroup,
and this makes skb_update_priority() faster when it's not set.

This also eliminates an off-by-one bug similar with the one fixed
in the previous patch.

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
---
 net/core/netprio_cgroup.c |    6 ------
 1 files changed, 0 insertions(+), 6 deletions(-)

diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index a296cbb..2edfa6b 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -270,7 +270,6 @@ static int netprio_device_event(struct notifier_block *unused,
 {
 	struct net_device *dev = ptr;
 	struct netprio_map *old;
-	u32 max_len = atomic_read(&max_prioidx);
 
 	/*
 	 * Note this is called with rtnl_lock held so we have update side
@@ -278,11 +277,6 @@ static int netprio_device_event(struct notifier_block *unused,
 	 */
 
 	switch (event) {
-
-	case NETDEV_REGISTER:
-		if (max_len)
-			extend_netdev_table(dev, max_len);
-		break;
 	case NETDEV_UNREGISTER:
 		old = rtnl_dereference(dev->priomap);
 		RCU_INIT_POINTER(dev->priomap, NULL);
-- 
1.7.3.1
--
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