linux-kernel - Re: [PATCH] x86/nmi: ratelimit unknown nmi logs

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Message-ID: <20190220085947.GA17969@hirez.programming.kicks-ass.net>
Date:   Wed, 20 Feb 2019 09:59:47 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Olof Johansson <olof@...om.net>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/nmi: ratelimit unknown nmi logs

On Tue, Feb 19, 2019 at 05:48:36PM -0800, Olof Johansson wrote:
> Getting notified of unknown NMIs is obviously important, but getting
> notified on every single one, especially on larger systems with slow
> (serial) console causes more harm than good when it's a known noisy
> non-relevant event.
> 
> So, let's ratelimit to avoid locking up the system.

What kind of bonghit broken crap system is that?

That is; this _really_ should not happen, and this is a bandaid, not
fixing the cause.