On Tue, Jan 26, 2021 at 02:12:45AM +0000, Zhang, Qiang wrote: > Hello Peterz, tglx > > I have some questions about migrate_disabe/enable(), in the past > migrate_disabe/enable() is replaced by preempt_disable/enable() in no > RT system. > > And now migrate_disabe/enable() has its own implementation, I want to > know in migrate_disabe/enable() critical area is blocking allowed?
Yes, obviously. Otherwise it would've been preempt_disable(). > If allowed, There's a blockage in migrate_disabe/enable() critical > area, and this time if CPU going offline，offline time will be longer. > Is this normal phenomenon？ Ofcourse.
