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

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Date:   Wed, 11 Dec 2019 09:41:05 +0000
From:   John Garry <john.garry@...wei.com>
To:     Marc Zyngier <maz@...nel.org>
CC:     Ming Lei <ming.lei@...hat.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "chenxiang (M)" <chenxiang66@...ilicon.com>,
        "bigeasy@...utronix.de" <bigeasy@...utronix.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hare@...e.com" <hare@...e.com>, "hch@....de" <hch@....de>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "bvanassche@....org" <bvanassche@....org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "mingo@...hat.com" <mingo@...hat.com>
Subject: Re: [PATCH RFC 1/1] genirq: Make threaded handler use irq affinity
 for managed interrupt

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);