linux-kernel - Re: [PATCH] netns: deinline net

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Date:	Tue, 14 Apr 2015 14:36:03 +0200
From:	Jiri Pirko <jpirko@...hat.com>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Jan Engelhardt <jengelh@...ozas.de>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] netns: deinline net_generic()

Tue, Apr 14, 2015 at 02:25:11PM CEST, dvlasenk@...hat.com wrote:
>On x86 allyesconfig build:
>The function compiles to 130 bytes of machine code.
>It has 493 callsites.
>Total reduction of vmlinux size: 27906 bytes.

Hmm. That is not much. How about performance impacts?

>
>   text	     data      bss       dec     hex filename
>82447071 22255384 20627456 125329911 77861f7 vmlinux4
>82419165 22255384 20627456 125302005 777f4f5 vmlinux5
>
>Signed-off-by: Denys Vlasenko <dvlasenk@...hat.com>
>CC: Eric W. Biederman <ebiederm@...ssion.com>
>CC: David S. Miller <davem@...emloft.net>
>CC: Jan Engelhardt <jengelh@...ozas.de>
>CC: Jiri Pirko <jpirko@...hat.com>
>CC: linux-kernel@...r.kernel.org
>CC: netdev@...r.kernel.org
>---
> include/net/netns/generic.h | 15 +--------------
> net/core/net_namespace.c    | 16 ++++++++++++++++
> 2 files changed, 17 insertions(+), 14 deletions(-)
>
>diff --git a/include/net/netns/generic.h b/include/net/netns/generic.h
>index 0931618..61a33bf 100644
>--- a/include/net/netns/generic.h
>+++ b/include/net/netns/generic.h
>@@ -31,18 +31,5 @@ struct net_generic {
> 	void *ptr[0];
> };
> 
>-static inline void *net_generic(const struct net *net, int id)
>-{
>-	struct net_generic *ng;
>-	void *ptr;
>-
>-	rcu_read_lock();
>-	ng = rcu_dereference(net->gen);
>-	BUG_ON(id == 0 || id > ng->len);
>-	ptr = ng->ptr[id - 1];
>-	rcu_read_unlock();
>-
>-	BUG_ON(!ptr);
>-	return ptr;
>-}
>+void *net_generic(const struct net *net, int id);
> #endif
>diff --git a/net/core/net_namespace.c b/net/core/net_namespace.c
>index cb5290b..66c9ba1 100644
>--- a/net/core/net_namespace.c
>+++ b/net/core/net_namespace.c
>@@ -42,6 +42,22 @@ EXPORT_SYMBOL(init_net);
> 
> static unsigned int max_gen_ptrs = INITIAL_NET_GEN_PTRS;
> 
>+void *net_generic(const struct net *net, int id)
>+{
>+	struct net_generic *ng;
>+	void *ptr;
>+
>+	rcu_read_lock();
>+	ng = rcu_dereference(net->gen);
>+	BUG_ON(id == 0 || id > ng->len);
>+	ptr = ng->ptr[id - 1];
>+	rcu_read_unlock();
>+
>+	BUG_ON(!ptr);
>+	return ptr;
>+}
>+EXPORT_SYMBOL(net_generic);
>+
> static struct net_generic *net_alloc_generic(void)
> {
> 	struct net_generic *ng;
>-- 
>1.8.1.4
>
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