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Date: Tue, 17 Mar 2015 05:45:22 +0100 From: Mike Galbraith <umgwanakikbuti@...il.com> To: Sebastian Andrzej Siewior <bigeasy@...utronix.de> Cc: linux-rt-users <linux-rt-users@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, Thomas Gleixner <tglx@...utronix.de>, rostedt@...dmis.org, John Kacur <jkacur@...hat.com> Subject: Re: [rfc patch v2] rt,nohz_full: fix nohz_full for PREEMPT_RT_FULL On Tue, 2015-03-17 at 02:53 +0100, Mike Galbraith wrote: > On Mon, 2015-03-16 at 21:24 +0100, Sebastian Andrzej Siewior wrote: > > What you do is that you accept the fact that the timer-softirq is > > scheduled for no reason and then you try to disable the tick from within > > the timer-softirq. I assumed that it would work get the "expired timer" > > somehow. > > Yup, it works around that otherwise crippling wakeup. If I re-apply.. > > timers-do-not-raise-softirq-unconditionally.patch > > ..the workaround is not needed of course, but the livelock fix still is. > I haven't yet tested that in 3.18-rt though, only 4.0-rt, but I presume > it'll be the same deal there when I do. Did that, and it is. Fire up tbench 4 + make -j4 on my i7-4790+smt box booted nohz_full=2,3,6,7, death spiral begins shortly thereafter. -Mike -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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