linux-kernel - Re: [PATCH 1/2] limit print_fatal_signal() rate (was: [RFC] log out-of-virtual-memory events)

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Date:	Thu, 24 May 2007 09:23:36 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	righiandr@...rs.sourceforge.net,
	Bernd Eckenfels <ecki@...a.inka.de>,
	linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>,
	linux-mm@...ck.org
Subject: Re: [PATCH 1/2] limit print_fatal_signal() rate (was: [RFC] log
 out-of-virtual-memory events)

On Thu, 24 May 2007 11:55:03 +0200 Ingo Molnar <mingo@...e.hu> wrote:

> 
> * Andrew Morton <akpm@...ux-foundation.org> wrote:
> 
> > On Thu, 24 May 2007 09:58:35 +0200 Ingo Molnar <mingo@...e.hu> wrote:
> > 
> > > 
> > > * Andrew Morton <akpm@...ux-foundation.org> wrote:
> > > 
> > > > Well OK.  But vdso-print-fatal-signals.patch is designated 
> > > > not-for-mainline anyway.
> > > 
> > > btw., why?
> > 
> > err, because that's what I decided a year ago.  I wonder why ;)
> > 
> > Perhaps because of the DoS thing, but it has a /proc knob and defaults 
> > to off, so it should be OK.
> 
> yeah. There's also a boot option. To address the DoS angle, should i 
> make it optionally printk_ratelimit() perhaps? (although often the 
> messages come in streams and skipping a message can be annoying)

I don't think so, really.  It takes a deliberate act to turn the thing
on, after all.

I we _were_ concerned about the logspam then it might be better to make the
feature turn itself off after 100 messages, rather than ratelimiting it.
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