Re: [GIT pull] irq updates for 4.13
From: Jens Axboe
Date: Tue Jul 04 2017 - 11:17:25 EST
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.