Re: [RFC] mm: khugepaged: use largest enabled hugepage order for min_free_kbytes

[Lorenzo Stoakes <lorenzo.stoakes@oracle.com>]

OK a 'reviewlet' :P (have to say I like this terminology...)

I see we are already ostensibly 'dynamic' in that hugepage_pmd_enabled() changes
our algorithm.

So my comments about dynamic alterting are probably not quite valid. Are we not
in a weird situation where, with mTHP-only enabled we just use
calculate_min_free_kbytes()??

That probably needs addressing (perhaps separately...)

Lord I hate how we do this (not your fault!)

Rest of review still applicable :>)

Thanks for raising these important issues, while I am raising technical
criticism of the patch, I do very much think you're identifying a real (and
really very significant for those using v. large page table sizes) problem we
need to address one way or another.

Cheers, Lorenzo