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Date: Thu, 5 Dec 2013 09:31:02 -0800 From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> To: Dave Jones <davej@...hat.com>, Linux Kernel <linux-kernel@...r.kernel.org> Subject: Re: lots of brief rcu stalls. On Thu, Dec 05, 2013 at 12:15:50PM -0500, Dave Jones wrote: > On Thu, Dec 05, 2013 at 08:49:12AM -0800, Paul E. McKenney wrote: > > > But what workload are you running that causes this? The only way I > > can think of to make this happen requires that you have at least one > > CPU spending more than 21 seconds running continuously in kernel mode. > > Is that what you are doing, or have you come up with some other creative > > way for this to happen? In the latter case, I would really like to know > > about it in case it exposes yet another flaw in my RCU design. ;-) > > just the regular trinity runs, so it could be anything. > (Running a few instances of it, with a couple dozen child processes each to drive up the loadavg) Well, trinity has caused kernel-mode execution periods in excess of 21 seconds in the past, so I will assume that this is the cause until further notice. > if only I had a trace or something that I could start to guess at what was happening :) Maybe creating such a trace would expose additional bugs. ;-) 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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