linux-kernel - Re: [PATCH 1/6] genirq: allow assigning affinity to present but not online CPUs

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Message-ID: <20170206170313.GB31902@lst.de>
Date:   Mon, 6 Feb 2017 18:03:13 +0100
From:   Christoph Hellwig <hch@....de>
To:     Keith Busch <keith.busch@...el.com>
Cc:     Christoph Hellwig <hch@....de>, Joe Korty <joe.korty@...r.com>,
        linux-nvme@...ts.infradead.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] genirq: allow assigning affinity to present but
        not online CPUs

On Mon, Feb 06, 2017 at 12:03:05PM -0500, Keith Busch wrote:
> Can we use the online CPUs and create a new hot-cpu notifier to the nvme
> driver to free/reallocate as needed? We were doing that before blk-mq. Now
> blk-mq can change the number hardware contexts on a live queue, so we
> can reintroduce that behavior to nvme and only allocate what we need.

That could be a next step, but given how badly I keep messing up core
IRQ bits we'll probably want to wait for two rewrites of those bits
from Thomas before moving on :)