Re: [tip:perfcounters/core] perf_counter: x86: Fix call-chain support to use NMI-safe methods
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- Subject: Re: [tip:perfcounters/core] perf_counter: x86: Fix call-chain support to use NMI-safe methods
- From: Ingo Molnar <mingo@xxxxxxx>
- Date: Mon, 15 Jun 2009 20:50:46 +0200
- Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, mingo@xxxxxxxxxx, hpa@xxxxxxxxx, paulus@xxxxxxxxx, acme@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, a.p.zijlstra@xxxxxxxxx, penberg@xxxxxxxxxxxxxx, vegard.nossum@xxxxxxxxx, efault@xxxxxx, jeremy@xxxxxxxx, npiggin@xxxxxxx, tglx@xxxxxxxxxxxxx, linux-tip-commits@xxxxxxxxxxxxxxx
- In-reply-to: <20090615183840.GA6520@Krystal>
- References: <tip-74193ef0ecab92535c8517f082f1f50504526c9b@xxxxxxxxxxxxxx> <alpine.LFD.2.01.0906151007560.3305@xxxxxxxxxxxxxxxxxxxxx> <20090615171845.GA7664@xxxxxxx> <alpine.LFD.2.01.0906151029160.3305@xxxxxxxxxxxxxxxxxxxxx> <20090615180527.GB4201@Krystal> <20090615182348.GC11248@xxxxxxx> <20090615183840.GA6520@Krystal>
- User-agent: Mutt/1.5.18 (2008-05-17)
* Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxx> wrote:
> I guess. However, having the ability to call module code in NMI
> handler context [...]
I dont think we really want to execute module-provided code from NMI
handlers. NMI context is pretty tricky to begin with. (Yes, i know
it's possible via nmi notifiers or modular oprofile but it's a
really bad practice IMHO.)
Ingo
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