Trouble with full nohz and lttng

[Mats Liljegren]

When I use lttng, I keep getting ticks. Without lttng, no ticks. It's
the same application I run, the same way. The only difference is
whether lttng logging has been started or not.

The trace says "sched" as reason for not disabled ticks. Using "top" I
can't see any extra process/thread being created while my application
runs, my application gets 99-101% of the CPU. There are a couple of
kworker threads (3), a migration thread and a ksoftirq thread on the
same CPU as my application, though "top" gives no indication that they
do any execution.

Is this a known limitation of lttng, or is there something else going on here?

/Mats
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/