Re: [PATCH] MAINTAINERS: move the BFQ io scheduler to orphan state

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On Thu, Sep 5, 2024 at 4:58 PM Jens Axboe <axboe@xxxxxxxxx> wrote:
> On 9/5/24 7:03 AM, Linus Walleij wrote:

> > Which production? For singlequeue devices it is pretty widespread.
>
> We tried it at one point internally at Meta, and it was not pretty.

I didn't know you used any singlequeue devices.

If you used it on multiqueue devices, well that can't be recommended.

> > Maybe we should propose these rules to the main udev repository
> > so that they also go into Debian and we get even wider use?
>
> I know you like to push for it to be the default, and I always push back
> because I don't think it's stable enough for that, and now we have the
> added complication that it hasn't been maintained for quite a while.
> So no, I don't think so.

The reason I like it personally is that it has actually saved me from
crashing my machine by preserving interactivity on a (single queue)
device:
https://people.kernel.org/linusw/bfq-saved-me-from-thrashing

For Androids and chromebooks it keeps the device interactive
during heavy disk (eMMC) activity, such as when Android
updates a pile of apps (.apk files).

> There are some bugzilla entries too that never got resolved or moved
> very far. Some of those may now be invalid, maybe not. Impossible to
> know.

OK fair enough, I hear there is a maintainer that will look after
it now.

Yours,
Linus Walleij





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