Re: [PATCH] x86/fault: speed up uffd-unit-test by 10x: rate-limit "MCE: Killing" logs

[Borislav Petkov]

On Mon, May 06, 2024 at 07:29:39PM -0700, John Hubbard wrote:
> Generating lots of memory poisoning events seems like a valid use case,
> by which I mean that this is not just a testing artifact. And that's why
> the fix applies to the code that directly generates the output, rather
> than the selftest that triggers it.

Sorry, not taking a "fix" for something hypothetical.

If this is a real issue on a real system and the printing is the
*actual* problem at hand in a hw error storm sure, but no, not because
a selftest runs slower.

I'm pretty sure in a hw error storm scenario, printk being slow is the
least of your problems.

And in such a scenario the *last* thing you wanna do is ratelimit prints
so that you can't even get all the logs which is *the* thing you need to
debug the hw.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette