netdev - Re: GFP_ATOMIC page allocation failures.

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Date:	Fri, 04 Apr 2008 11:52:34 +0200
From:	Bodo Eggert <7eggert@....de>
To:	Nick Piggin <nickpiggin@...oo.com.au>,
	Jeff Garzik <jeff@...zik.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Chris Snook <csnook@...hat.com>,
	Dave Jones <davej@...emonkey.org.uk>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	NetDev <netdev@...r.kernel.org>,
	David Miller <davem@...emloft.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: GFP_ATOMIC page allocation failures.

Nick Piggin <nickpiggin@...oo.com.au> wrote:
> On Thursday 03 April 2008 05:18, Jeff Garzik wrote:

>> Turning to Nick's comment,
>>
>> > It's still actually nice to know how often it is happening even for
>> > these known good sites because too much can indicate a problem and
>> > that you could actually bring performance up by tuning some things.
>>
>> then create a counter or acculuation buffer somewhere.
>>
>> We don't need spew every time there is memory pressure of this magnitude.
> 
> Not a complete solution. Counter would be nice, but you need backtraces
> and want a way to more proactively warn the user/tester/developer.
> 
> I agree that I don't exactly like adding nowarns around, and I don't think
> places like driver writers should have to know about this stuff.

What about reverse ratelimiting: If the limit is reached, a backtrace will be
generated (and, off cause, positively ratelimited)?

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