Re: [PATCH RFC 1/1] genirq: Make threaded handler use irq affinity for managed interrupt

[John Garry]

On 10/12/2019 18:32, Marc Zyngier wrote:
> > > > The ITS code will make the lowest online CPU in the affinity mask
> > > > the
> > > > target CPU for the interrupt, which may result in some CPUs
> > > > handling
> > > > so many interrupts.
> > > If what you want is for the*default*  affinity to be spread around,
> > > that should be achieved pretty easily. Let me have a think about how
> > > to do that.
> > Cool, I anticipate that it should help my case.
> >
> > I can also seek out some NVMe cards to see how it would help a more
> > "generic" scenario.
> Can you give the following a go? It probably has all kind of warts on
> top of the quality debug information, but I managed to get my D05 and
> a couple of guests to boot with it. It will probably eat your data,
> so use caution!;-)

Hi Marc,

Ok, we'll give it a spin.

Thanks,
John

> Thanks,
>
>           M.
>
> diff --git a/drivers/irqchip/irq-gic-v3-its.c
> b/drivers/irqchip/irq-gic-v3-its.c
> index e05673bcd52b..301ee3bc0602 100644
> --- a/drivers/irqchip/irq-gic-v3-its.c
> +++ b/drivers/irqchip/irq-gic-v3-its.c
> @@ -177,6 +177,8 @@ static DEFINE_IDA(its_vpeid_ida);