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

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Date:	Fri, 18 Sep 2009 13:50:53 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Roland Dreier <rdreier@...co.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, 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
Subject: Re: [ofa-general] Re: [GIT PULL] please pull ummunotify


* Roland Dreier <rdreier@...co.com> wrote:

>  > But yeah, I currently don't see a very nice match to perf counters.
> 
> OK.  It would be nice to tie into something more general, but I think 
> I agree -- perf counters are missing the filtering and the "no lost 
> events" that ummunotify does have.  And I'm not sure it's worth 
> messing up the perf counters design just to jam one more not totally 
> related thing in.

The filtering can be done and has been done - see Li Zefan's patchset 
that uses filter expressions to do per event in-kernel filtering.

The OOM DoS is a bug in your patches i think, which perfcounters solves 
;-)

	Ingo
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