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

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Date:	Tue, 14 Apr 2015 08:25:26 -0700
From:	Eric Dumazet <eric.dumazet@...il.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>,
	Jiri Pirko <jpirko@...hat.com>, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH] netns: deinline net_generic()

On Tue, 2015-04-14 at 17:04 +0200, Denys Vlasenko wrote:
> On 04/14/2015 04:21 PM, Eric Dumazet wrote:
> > On Tue, 2015-04-14 at 15:57 +0200, Denys Vlasenko wrote:
> > 
> >> My allyesconfig, with BUG_ON's commented out:
> >>
> > 
> > Right. But I can tell you nobody uses lockdep on a production kernel.
> > 
> > Here, at Google, we get what I described.
> 
> I'm trying to get to the .config which generates a small function.
> 
> So far, with LOCKDEP off, it is still this big:
> 

If you read exactly what I wrote, you'll understand that at Google,
rcu_read_lock() & rcu_read_unlock() are nop.

Your patch is based on a worst case scenario, and will slow down our use
case.



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