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Date: Tue, 15 May 2012 14:29:22 -0400 (EDT)
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Subject: Re: [RFC net-next 0/2] net: Use net_<level>_ratelimit
From: David Miller <davem@davemloft.net>
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From: Johannes Berg <johannes@sipsolutions.net>
Date: Tue, 15 May 2012 20:27:10 +0200

> On Tue, 2012-05-15 at 10:59 -0700, Joe Perches wrote:
> 
>> OK, but fyi, there's a possible issue with !CONFIG_DEBUG
>> builds because these patches converted some uses of
>> 	if (net_ratelimit())
>> 		printk(KERN_DEBUG ...
>> to
>> 	net_dbg_ratelimited()
>> 
>> These messages are no longer emitted when DEBUG isn't defined
>> and not using dynamic_debug.  I'm not sure that's a real
>> problem, but it's a difference.
>> 
>> I could produce a net_printk_ratelimited that would keep
>> the original behavior if necessary.
>> 
>> 	net_printk_ratelimited(KERN_DEBUG etc...)
> 
> Btw, what would the difference be to just plain printk_ratelimited()?

printk_ratelimited() drops a local ratelimit cookie into each call-site,
whereas we have a global one for the networking which these new interfaces
use.

Joe explained this completely in his 0/2 patch posting.