linux-kernel - Re: perf: kernel memory leak when inherit enabled

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Message-ID: <1300180077.2203.56.camel@twins>
Date:	Tue, 15 Mar 2011 10:07:57 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Vince Weaver <vweaver1@...s.utk.edu>
Cc:	linux-kernel@...r.kernel.org, Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: perf: kernel memory leak when inherit enabled

On Mon, 2011-03-14 at 18:27 -0400, Vince Weaver wrote:
> On Fri, 11 Mar 2011, Vince Weaver wrote:
> > 
> > While trying to use perf events with inherit enabled to profile some 
> > multi-threaded BLAS routines (using PAPI) I ended up out-of-memorying my 
> > machine.  It turns out you can quickly leak gigabytes of kernel memory
> > that isn't freed when the process exits.
> 
> I've bisected this.  There's a whole day I'll never see again. binutils 
> 2.21 and gcc-4.5 for the lose :(
> 
> Anyway this memory leak with inherit was introduced in 
>   4fd38e4595e

Thanks, managed to get some time yesterday and got as far as to see that
our perf_event_context refcounting is indeed screwy, but didn't get
around to actually catching the culprit.


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