linux-kernel - Re: RFC: futex_wait() can DoS the tick

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Message-ID: <1434048933.3396.62.camel@gmail.com>
Date:	Thu, 11 Jun 2015 20:55:33 +0200
From:	Mike Galbraith <umgwanakikbuti@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: RFC: futex_wait() can DoS the tick

On Thu, 2015-06-11 at 20:52 +0200, Thomas Gleixner wrote:
> On Thu, 11 Jun 2015, Mike Galbraith wrote:
> > On Thu, 2015-06-11 at 15:13 +0200, Thomas Gleixner wrote:
> > 
> > > The kernel does not care whether the actual interrupt happens or the
> > > timer is expired by other means.
> > 
> > Final question: Notabug explanation fits.. but why would the behavior
> > delta be so radical and repeatable w/wo deadline timer on some boxen?
> 
> Good question. Cannot answer that w/o looking at traces.

I may come back with some, I spent enough time doing circular notabug
chasing all over hell and creation to be a tad annoyed ;-)

	-Mike


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