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

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Message-ID: <20a3d23f-2e56-e118-a355-e05dfcebe001@kernel.dk>
Date:   Tue, 4 Jul 2017 09:17:17 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Max Gurtovoy <maxg@...lanox.com>,
        Christoph Hellwig <hch@....de>
Cc:     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 07/03/2017 06:00 PM, Linus Torvalds wrote:
> But I'd like people to look at that - not so much due to the evil
> merge itself (but check that too, by any means), but just because the
> code seems fundamentally broken for the hotplug case. We end up
> picking a possible metric shit-ton of CPU's for queue 0, if they were
> "possible but not online".
> 
> 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.

-- 
Jens Axboe