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Message-ID: <4A36BF61.10901@zytor.com>
Date: Mon, 15 Jun 2009 14:38:41 -0700
From: "H. Peter Anvin" <hpa@...or.com>
To: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC: Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Linus Torvalds <torvalds@...ux-foundation.org>,
mingo@...hat.com, paulus@...ba.org, acme@...hat.com,
linux-kernel@...r.kernel.org, penberg@...helsinki.fi,
vegard.nossum@...il.com, efault@....de, jeremy@...p.org,
npiggin@...e.de, tglx@...utronix.de,
linux-tip-commits@...r.kernel.org
Subject: Re: [tip:perfcounters/core] perf_counter: x86: Fix call-chain support
to use NMI-safe methods
Mathieu Desnoyers wrote:
>
> As the maintainer of the out-of-tree LTTng tracer, which hooks in the
> page fault handler with tracepoints, and which can build almost entirely
> as modules, I am very tempted to argue that having the nmi-code entirely
> robust wrt in-kernel page faults would be a very-nice-to-have feature.
>
I doubt that is ever going to be reliable, due to reentrancy issues.
-hpa
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