netdev - Re: [PATCH 2.6.25] netns: struct net content re-work

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Date:	Mon, 10 Dec 2007 20:50:14 +0300
From:	Kirill Korotaev <dev@...ru>
To:	Daniel Lezcano <dlezcano@...ibm.com>
CC:	"Denis V. Lunev" <den@...nvz.org>, containers@...ts.osdl.org,
	netdev@...r.kernel.org, davem@...emloft.net,
	herbert@...dor.apana.org.au
Subject: Re: [PATCH 2.6.25] netns: struct net content re-work

Daniel Lezcano wrote:
> Denis V. Lunev wrote:
> 
>>Recently David Miller and Herbert Xu pointed out that struct net becomes
>>overbloated and un-maintainable. There are two solutions:
>>- provide a pointer to a network subsystem definition from struct net.
>>  This costs an additional dereferrence
>>- place sub-system definition into the structure itself. This will speedup
>>  run-time access at the cost of recompilation time
>>
>>The second approach looks better for us. 
> 
> 
> Yes, we do not need/want a pointer in this structure and add more 
> dereference in the network code.
> 
> 
>>Other sub-systems will be converted
>>to this approach if this will be accepted :)
>>
>>Signed-off-by: Denis V. Lunev <den@...nvz.org>
>>---
>>diff --git a/include/net/net_namespace.h b/include/net/net_namespace.h
>>index b62e31f..f60e1ce 100644
>>--- a/include/net/net_namespace.h
>>+++ b/include/net/net_namespace.h
>>@@ -8,6 +8,8 @@
>> #include <linux/workqueue.h>
>> #include <linux/list.h>
>>
>>+#include <net/netns/unix.h>
>>+
>> struct proc_dir_entry;
>> struct net_device;
>> struct sock;
>>@@ -46,8 +48,7 @@ struct net {
>> 	struct hlist_head	packet_sklist;
>>
>> 	/* unix sockets */
>>-	int			sysctl_unix_max_dgram_qlen;
>>-	struct ctl_table_header	*unix_ctl;
>>+	struct netns_unix	unx;
> 
> 
> Can you change this from unx to unix ?

no, it won't compile. Guess why :)

> If you encapsulate the structure definitions per subsystem, you can drop 
> the unix prefix in the variable declaration.
> 
> Instead of having:
> 	netns->unix->unix_ctl
> you will have:
> 	netns->unix->ctl

agree.

Kirill
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