linux-kernel - Re: [PATCH V3 0/4] genirq/affinity: irq vector spread among online CPUs as far as possible

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Date:   Tue, 13 Mar 2018 10:39:35 +0200
From:   Artem Bityutskiy <dedekind1@...il.com>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Dou Liyang <douly.fnst@...fujitsu.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jens Axboe <axboe@...nel.dk>,
        Christoph Hellwig <hch@...radead.org>,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        Laurence Oberman <loberman@...hat.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH V3 0/4] genirq/affinity: irq vector spread among online
 CPUs as far as possible

On Tue, 2018-03-13 at 16:35 +0800, Ming Lei wrote:
> Then looks this issue need to fix by making possible CPU count
> accurate
> because there are other resources allocated according to
> num_possible_cpus(),
> such as percpu variables.

Short term the regression should be fixed. It is already v4.16-rc6, we
have little time left.

Longer term, yeah, I agree. Kernel's notion of possible CPU count
should be realistic.

Artem.