linux-kernel - Re: Slow down stupid pounders

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Message-ID: <1399380153.5192.219.camel@marge.simpson.net>
Date:	Tue, 06 May 2014 14:42:33 +0200
From:	Mike Galbraith <mgalbraith@...e.de>
To:	Borislav Petkov <bp@...en8.de>
Cc:	lkml <linux-kernel@...r.kernel.org>, x86-ml <x86@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mel Gorman <mgorman@...e.com>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: Slow down stupid pounders

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

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