Re: [patch] x86_64, irq: check remote IRR bit before migrating level triggered irq

[Eric W. Biederman]

"Yinghai Lu" <yhlu.kernel@xxxxxxxxx> writes:

> Eric,
>
> ioapic_level irq is limited, So if we keep vector number not changed
> when imgration to other cpus.  It that could help.

We can solve the problem without doing that, and keeping the same
vector number during migration keeps x86 from scaling.  Personally
I would prefer to disallow irq migration.

> it will need modify a little with assign_irq_vector and
> irq_complete_move/smp_irq_move_cleanup_interrupt. because it assume
> vector must be changed.

Yes it does.

Eric
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