Messages in this thread | | | Date | Tue, 26 Jan 2021 10:22:48 +0100 | From | Peter Zijlstra <> | Subject | Re: Question on migrate_disabe/enable() |
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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.
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