On 2020-06-16 14:04:25 [-0300], Marcelo Tosatti wrote: > It is affected. The workqueue thread for a given CPU is SCHED_OTHER, which can't > interrupt a SCHED_FIFO task which does not sleep. Okay. So it is a problem which exists independently of -RT. As I pointed out to Juri, vmstat_update() should have the very same problem, correct? Sebastian