Re: Slow down stupid pounders

[Pavel Machek]

On Tue 2014-05-06 18:10:04, Borislav Petkov wrote:
> On Tue, May 06, 2014 at 05:08:19PM +0200, Mike Galbraith wrote:
> > Rather than ratelimit the interface perhaps send a ratelimited note
> > telling the user straight up that he's begging for trouble. We can
> > ignore it when regression testing, and point it out to Joe Pounder
> > should he fail to notice.. or be somewhat dense.
> 
> Yeah, if those dudes don't stare at dmesg, that note doesn't bring us
> whit.
> 
> Alternatively, we could do
> 
> 	add_taint(TAINT_HOTPLUG_POUNDER)
> 
> when the rate is exceeded...
> 
> I'd rather like to slow it down for a second, though, if it doesn't hurt
> any sensible use cases in doing so.

Actually, you should just taint as soon as someone tries to use cpu hotplug if 
it does not work. 

I wonder what happens on those multi-core android phones. They suspend multiple 
times a second. Do they do cpu hotplugs at that point?
									Pavel
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