Re: [Xen-devel] [PATCH 0/4] Allow schedulers to be selectable through Kconfig

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 18.12.15 at 11:45, <ian.campbell@xxxxxxxxxx> wrote:
> How would people feel about a CONFIG_STANDARD_FEATURESET[0] with the
> majority of tweakables depending on !STANDARD_FEATURESET? It would default
> Y with a help text which dissuades normal users from touching it ("Say Y,
> unless you are willing to pick up the pieces yourself. We do not routinely
> test or validate configurations without this option set. We expect you to
> offer to fix issues which you find. Beware of the leopard.").[1]

I like this; I'd suggest using Linux'es CONFIG_EXPERT though,
defaulting to off. One thing I'd like to be investigated then would be
the possibility of even hiding that option's prompt by default, so
that the average user won't say "I'm enough of an expert" just
because of seeing the option. It would then need manual switching
to Y in xen/.config.

> I might even go so far as to suggest that !STANDARD_FEATURESET
> configurations would not be subject to security support (i.e. issues which
> can _only_ arise with that option disabled are't covered).
> 
> The bar for adding a new option which does not depend on
> !STANDARD_FEATURESET would be _high_.

I second both of these.

Jan


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