Messages in this thread |  | | Date | Thu, 5 Dec 2013 09:31:02 -0800 | From | "Paul E. McKenney" <> | Subject | Re: lots of brief rcu stalls. |
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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
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