Re: [PATCH] mmc: core: Imply IOSCHED_BFQ

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On Tue, Jan 31, 2023 at 10:01 AM Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
> On Tue, Jan 31, 2023 at 09:47:42AM +0100, Linus Walleij wrote:
> > If we enable the MMC/SD block layer, use Kconfig to imply the BFQ
> > I/O scheduler.
> >
> > As all MMC/SD devices are single-queue, this is the scheduler that
> > users want so let's be helpful and make sure it gets
> > default-selected into a manual kernel configuration. It will still
> > need to be enabled at runtime (usually with udev scripts).
>
> NAK.  Nothing requires a specific scheduler here - the scheduler is a
> pure user choice.

If MMC required a specific scheduler I would use

select IOSCHED_BFQ.

Now it doesn't require it, it will just perform better, so thus I use

imply IOSCHED_BFQ

the point with it is to help users make the right decisions, not
enforce them. fs/crypto/Kconfig does the same thing for example,
advice not enforce.

Yours,
Linus Walleij



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