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From: Peter Zijlstra <peterz@infradead.org>
To: "Zhang, Qiang" <Qiang.Zhang@windriver.com>
Cc: "tglx@linutronix.de" <tglx@linutronix.de>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: Question on migrate_disabe/enable()
Date: Tue, 26 Jan 2021 10:22:48 +0100	[thread overview]
Message-ID: <YA/faHXHWw1UfmUB@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <BYAPR11MB2632E0BCC9CE86D7DB6E7CFEFFBC9@BYAPR11MB2632.namprd11.prod.outlook.com>

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.

      reply	other threads:[~2021-01-26 18:06 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-26  2:12 Question on migrate_disabe/enable() Zhang, Qiang
2021-01-26  9:22 ` Peter Zijlstra [this message]

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