Re: lots of brief rcu stalls.

Dave Jones
2013-12-05T17:16:00Z

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)

if only I had a trace or something that I could start to guess at what was happening :)

Dave