Re: Slow down stupid pounders

[Mike Galbraith <mgalbraith@suse.de>]

On Tue, 2014-05-06 at 12:29 +0200, Borislav Petkov wrote: 
> Hi,
> 
> so I'm getting sick'n'tired of all those bug reports of people pounding
> cpu hotplug with stupid scripts.
> 
> * We know cpu hotplug is fragile/buggy/crap/needs proper rewrite.
> 
> * Stupid hotplugging script doesn't resemble any real use case - go use
> a real benchmark/stress test to trigger bugs.
> 
> So if we can't make pounders stop jerking off, let's make it
> uninterestingly slow. Stupid patch below, it might be completely idiotic
> to do it this way but at least starts the discussion about this being a
> really annoying issue which needs some sort of dealing with.
> 
> I dunno, we can make it configurable (which will probably defeat its
> purpose partially), we can do some more fancy ratelimiting, per cpu,
> whatever... we'll see.
> 
> Opinions, flames?

Damn.  I was gonna suggest we shorten hours in -rt kernels to achieve my
full day stress testing survival goal.

-Mike