linux-kernel - Re: frequent lockups in 3.18rc4

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Message-ID: <20141219194410.GO30905@twins.programming.kicks-ass.net>
Date:	Fri, 19 Dec 2014 20:44:10 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dave Jones <davej@...hat.com>, Chris Mason <clm@...com>,
	Mike Galbraith <umgwanakikbuti@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Dâniel Fraga <fragabr@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Suresh Siddha <sbsiddha@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Anvin <hpa@...ux.intel.com>
Subject: Re: frequent lockups in 3.18rc4

On Fri, Dec 19, 2014 at 11:15:21AM -0800, Linus Torvalds wrote:

>      sched: RT throttling activated

> 
> And after RT throttling, it's random (not even always trinity), but
> that's probably because the watchdog thread doesn't run reliably any
> more.

So if we want to shoot that RT throttling in the head you can do:

echo -1 > /proc/sys/kernel/sched_rt_runtime_us

That should completely disable that stuff, of course at that point a
run-away RR/FIFO thread will hog your cpu indefinitely.
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