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

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Message-ID: <1429187895.7346.195.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 16 Apr 2015 05:38:15 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Denys Vlasenko <dvlasenk@...hat.com>
Cc:	David Miller <davem@...emloft.net>, ebiederm@...ssion.com,
	jengelh@...ozas.de, jpirko@...hat.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH] netns: deinline net_generic()

On Thu, 2015-04-16 at 13:14 +0200, Denys Vlasenko wrote:

> However, without BUG_ONs, function is still a bit big
> on PREEMPT configs.

Only on allyesconfig builds, that nobody use but to prove some points
about code size.

If you look at net_generic(), it is mostly used from code that is
normally in 3 modules. How many people really load them ?

net/tipc : 91 call sites
net/sunrpc : 57
fs/nfsd & fs/lockd : 183

Then few remaining uses in tunnels.

As we suggested, please just remove the BUG_ON().

Then, if you can come up with a solution that does not slow down non
PREEMPT kernel, why not.

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