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SubjectRe: [patch 1/2] mm, page_alloc: extend kernelcore and movablecore for percent
On Tue, 13 Feb 2018 15:55:11 -0800 (PST) David Rientjes <rientjes@google.com> wrote:

> >
> > Is this fine-grained enough? We've had percentage-based tunables in
> > the past, and 10 years later when systems are vastly larger, 1% is too
> > much.
> >
>
> They still have the (current) ability to define the exact amount of bytes
> down to page sized granularity, whereas 1% would yield 40GB on a 4TB
> system. I'm not sure that people will want any finer-grained control if
> defining the proportion of the system for kernelcore. They do have the
> ability with the existing interface, though, if they want to be that
> precise.
>
> (This is a cop out for not implementing some fractional percentage parser,
> although that would be possible as a more complete solution.)

And the interface which you've proposed can be seamlessly extended to
accept 0.07%, so not a problem.

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