Re: elevator= kernel argument for recent kernels

[Jens Axboe <axboe@kernel.dk>]

On 11/6/19 3:53 AM, Jan Kara wrote:
> Hello,
> 
> with transition to blk-mq, the elevator= kernel argument was removed. I
> understand the reasons for its removal but still I think this may come as a
> surprise to some users since that argument has been there for ages and
> although distributions generally transition to setting appropriate elevator
> by udev rules, there are still people that use that argument with older
> kernels and there are quite a few advices on the Internet to use it. So
> shouldn't we at least warn loudly if someone uses elevator= argument on
> kernels that don't support it and redirect people to sysfs? Something like
> the attached patch? What do people think?

I'm fine with that, my objects have always been centered around trying
to make the parameter work. A warning makes sense to point people in
the right direction. I'll add this for 5.5.

-- 
Jens Axboe