linux-kernel - [PATCH 19/24] sysctl: ipv4: register devinet tables as private children

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Date:	Sat,  2 Apr 2011 04:53:33 +0200
From:	Lucian Adrian Grijincu <lucian.grijincu@...il.com>
To:	"'David S . Miller'" <davem@...emloft.net>,
	Alexey Dobriyan <adobriyan@...il.com>,
	"Eric W . Biederman" <ebiederm@...ssion.com>,
	Octavian Purdila <tavi@...pub.ro>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Cc:	Lucian Adrian Grijincu <lucian.grijincu@...il.com>
Subject: [PATCH 19/24] sysctl: ipv4: register devinet tables as private children

This halves the time it takes to add an interface:

$ time modprobe dummy numdummies=$n

Without this patch:
 - n=5000 => real: 17:31m, sys 15:29m
 - n=2000 => real:  2:23m, sys  2:19m
 - n=1000 => real:  0:25m, sys  0:24m

With this patch:
 - n=5000 => real:  9:14m, sys: 8:46m
 - n=2000 => real:  1:19m, sys: 1:17m
 - n=1000 => real:  0:14m, sys: 0:14m

Signed-off-by: Lucian Adrian Grijincu <lucian.grijincu@...il.com>
---
 net/ipv4/devinet.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index a31cc90..2a10365 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1656,8 +1656,8 @@ static int __devinet_sysctl_register(struct net *net, char *dev_name,
 
 	devinet_ctl_path[DEVINET_CTL_PATH_DEV].procname = t->dev_name;
 
-	t->sysctl_header = register_net_sysctl_table(net, devinet_ctl_path,
-			t->devinet_vars);
+	t->sysctl_header = register_net_sysctl_table_with_parent(net,
+			 devinet_ctl_path, t->devinet_vars, net->ipv4.conf_hdr);
 	if (!t->sysctl_header)
 		goto free_procname;
 
-- 
1.7.5.rc0

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