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

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Date:	Fri, 11 Mar 2011 17:54:17 -0500 (EST)
From:	Vince Weaver <vweaver1@...s.utk.edu>
To:	linux-kernel@...r.kernel.org
cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: perf: kernel memory leak when inherit enabled

Hello

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 attached a test case that reproduces this.

It leaks on 2.6.37 and 2.6.35.9.  It does not on 2.6.32.

I would like to try on current git and maybe even bisect, but my devel 
machine currently is broken with the ".size expression does not evaluate 
to a constant" binutils nonsense.

Unfortunately I won't have much chance to test any more until Monday, but 
I thought I'd send this in case it's something obvious that can be easily 
reproduced and fixed.

Thanks,

Vince
vweaver1@...s.utk.edu
View attachment "pe_inherit_memleak.c" of type "TEXT/x-csrc" (1749 bytes)