Re: [PATCH V3 00/11] block-throttle: add .high limit

From: Mark Brown
Date: Thu Oct 06 2016 - 07:04:12 EST

On Thu, Oct 06, 2016 at 10:04:41AM +0200, Linus Walleij wrote:
> On Tue, Oct 4, 2016 at 9:14 PM, Tejun Heo <tj@xxxxxxxxxx> wrote:

> > I get that bfq can be a good compromise on most desktop workloads and
> > behave reasonably well for some server workloads with the slice
> > expiration mechanism but it really isn't an IO resource partitioning
> > mechanism.

> Not just desktops, also Android phones.

> So why not have BFQ as a separate scheduling policy upstream,
> alongside CFQ, deadline and noop?


> We're already doing the per-usecase Kconfig thing for preemption.
> But maybe somebody already hates that and want to get rid of it,
> I don't know.

Hannes also suggested going back to making BFQ a separate scheduler
rather than replacing CFQ earlier, pointing out that it mitigates
against the risks of changing CFQ substantially at this point (which
seems to be the biggest issue here).

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