linux-kernel - Re: [GIT pull] irq updates for 4.13

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Date:   Tue, 4 Jul 2017 15:56:24 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Max Gurtovoy <maxg@...lanox.com>,
        Christoph Hellwig <hch@....de>,
        LKML <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [GIT pull] irq updates for 4.13

On 07/04/2017 12:34 PM, Linus Torvalds wrote:
> On Tue, Jul 4, 2017 at 8:17 AM, Jens Axboe <axboe@...nel.dk> wrote:
>> On 07/03/2017 06:00 PM, Linus Torvalds wrote:
>>>
>>> If they ever do come online, does that get fixed? I don't know.
>>> Somebody should check.
>>
>> Yes, the blk-mq cpu hotplug code updates mappings when CPUs come and
>> go, so that part is fine. That's exercised everytime the laptop is
>> suspended and resumed.
> 
> I don't think that's true any more. Commit fe631457ff3e changed it to
> map the initial CPU's sequentially whether they are online or not.
> Only after you run out of hardware queues will we start playing games.
> 
> That's what worries me about the conflict - the two changes did very
> different things to the same code. I'd really like somebody to take a
> look at my resolution, and just in general how those two different
> changes work together.

OK, I'll take a look at it tomorrow.

-- 
Jens Axboe