linux-kernel - Question on migrate

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Date:   Tue, 26 Jan 2021 02:12:45 +0000
From:   "Zhang, Qiang" <Qiang.Zhang@...driver.com>
To:     "peterz@...radead.org" <peterz@...radead.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Question on migrate_disabe/enable()

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?  

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？

Thanks
Qiang