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Date: Fri, 8 Aug 2014 14:46:48 -0700 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Amit Shah <amit.shah@...hat.com> Cc: linux-kernel@...r.kernel.org, riel@...hat.com, mingo@...nel.org, laijs@...fujitsu.com, dipankar@...ibm.com, akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com, josh@...htriplett.org, niv@...ibm.com, tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com, fweisbec@...il.com, oleg@...hat.com, sbw@....edu Subject: Re: [PATCH tip/core/rcu 1/2] rcu: Parallelize and economize NOCB kthread wakeups On Fri, Aug 08, 2014 at 02:43:47PM -0700, Paul E. McKenney wrote: > On Sat, Aug 09, 2014 at 12:04:24AM +0530, Amit Shah wrote: > > On (Fri) 08 Aug 2014 [11:18:35], Paul E. McKenney wrote: > > [ . . . ] > > > > Hmmm... What happens if you boot a7d7a143d0b4cb1914705884ca5c25e322dba693 > > > with the kernel parameter "acpi=off"? > > > > That doesn't change anything - still hangs. > > > > I intend to look at this more on Monday, though - turning in for > > today. In the meantime, if there's anything else you'd like me to > > try, please let me know. > > OK, given that I still cannot reproduce it, I do need your help with > the diagnostics. And so what sorts of diagnostics work for you in > the hung state? Are you able to dump ftrace buffers? > > If you are able to dump ftrace buffers, please enable rcu:rcu_nocb_wake > and send me the resulting trace. And another random kernel boot parameter to try is rcu_nocb_poll. Thanx, Paul -- 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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