linux-kernel - Re: [BUG] perf and kmemcheck : fatal combination

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Date:	Tue, 26 Apr 2011 22:13:12 +0300
From:	Pekka Enberg <penberg@...nel.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Eric Dumazet <eric.dumazet@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Paul Mackerras <paulus@...ba.org>,
	Vegard Nossum <vegardno@....uio.no>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [BUG] perf and kmemcheck : fatal combination

On Tue, 2011-04-26 at 14:33 +0200, Peter Zijlstra wrote:
> On Tue, 2011-04-26 at 14:27 +0200, Eric Dumazet wrote:
> > Thats far from trivial, maybe because we dont have NOTRACK api for
> > percpu allocations ? 
> 
> We can't use per-cpu allocations from NMI context because of the same
> problem, per-cpu uses vmalloc and vmalloc needs faults. Hence that
> shouldn't be a problem.
> 
> It looks like you covered most of it though, the buffer and the
> callchain stuff, aside from that it should only use some static data.
> 
> Pekka, what does kmemcheck do for .data and .bss things?

No, kmemcheck is only active for memory allocated with slab and the page
allocator .

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