On 02/25/2016 11:18 AM, Sebastian Andrzej Siewior wrote: > not that I am aware of. There are a few per-CPU threads which have to > stay the way they are. I would have expected that others like kworker/u* > respect the isol CPUs and stay away. Isolcpus is applied only for user-space threads. For instance, you still need to move rcu offload callbacks away from isolated CPUs, and all other kernel threads as well. In the special case of kworker/u* threads, you need to use a special interface to do it. The interface is the following file: /sys/devices/virtual/workqueue/cpumask It was implemented on the following commit: 042f7df workqueue: Allow modifying low level unbound workqueue cpumask But the default CPU mask is the "cpu_possible_mask". Sometime ago I sent a patch to modify the default mask of the kworker/u* threads, to avoid them on isolated CPUs by default, but it was not acked. It was not explicitly nacked, though. http://www.gossamer-threads.com/lists/linux/kernel/2218495 Should I try it again? -- Daniel -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
