* Question on migrate_disabe/enable()
@ 2021-01-26 2:12 Zhang, Qiang
2021-01-26 9:22 ` Peter Zijlstra
0 siblings, 1 reply; 2+ messages in thread
From: Zhang, Qiang @ 2021-01-26 2:12 UTC (permalink / raw)
To: peterz, tglx; +Cc: linux-kernel
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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Question on migrate_disabe/enable()
2021-01-26 2:12 Question on migrate_disabe/enable() Zhang, Qiang
@ 2021-01-26 9:22 ` Peter Zijlstra
0 siblings, 0 replies; 2+ messages in thread
From: Peter Zijlstra @ 2021-01-26 9:22 UTC (permalink / raw)
To: Zhang, Qiang; +Cc: tglx, linux-kernel
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.
^ permalink raw reply [flat|nested] 2+ messages in thread
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