IRQ dynamic distribution : A9-MPCore + GIC

Hi,

Is there any available work on IRQ dynamic distribution for A9-MPCore platform with GIC ?
I see it is available for x86 APIC platform and priority based support can be implemented for A9-MPCore/GIC combination.

It would be useful for reducing latency.

thanks,
Suresh

I tried to get IRQ balancing working with the initial ARM SMP implementation but I found it impossible to behave sanely within kernel space. I don't remember what the exact problems were though - this was five or so years ago.

The advice I got from Arjan van de Ven (author of Powertop) was not to bother - the kernel IRQ balancer is flawed because it constantly shifts IRQs between CPUs, meaning that they don't benefit from cache hotness. There are also implementations for IRQ balancing in userspace which could do a far better job.