linux-kernel - Re: [ofa-general] Re: [GIT PULL] please pull ummunotify

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Message-Id: <1253200944.14935.29.camel@laptop>
Date:	Thu, 17 Sep 2009 17:22:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Roland Dreier <rdreier@...co.com>
Cc:	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	Paul Mackerras <paulus@...ba.org>,
	Anton Blanchard <anton@...ba.org>,
	general@...ts.openfabrics.org, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: [ofa-general] Re: [GIT PULL] please pull ummunotify

On Thu, 2009-09-17 at 08:03 -0700, Roland Dreier wrote:
> > Hmm, or are you saying you can only get 1 event per registered range and
>  > allocate the thing on registration? That'd need some registration limit
>  > to avoid DoS scenarios.
> 
> Yes, that's what I do.  You're right, I should add a limit... although
> their are lots of ways for userspace to consume arbitrary amounts of
> kernel resources already.

I'd be good to work at reducing that number, not adding to it ;-)

But yeah, I currently don't see a very nice match to perf counters.

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