Re: + mm-thp-avoid-unnecessary-swapin-in-khugepaged.patch added to -mm tree

On Fri 20-05-16 16:44:50, Minchan Kim wrote:

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That being said khugepaged_max_ptes_none = HPAGE_PMD_NR/2 sounds like a

max_ptes_none?

Not sure I understand what you mean here.

We are talking about max_ptes_swap and max_active_pages(i.e., pte_young)
but suddenly you are saying max_ptes_none so I was curious it was just
typo.

Because the default for pte_none resp. zero pages collapsing into THP is
khugepaged_max_ptes_none and the current default means that a single
present page is sufficient. That is way too optimistic. So I consider
this to be a good start. I am not so sure about minimum young pages
because that would probably require yet another tunable and we have more
than enough of them. Anyway I guess we are getting off-topic here...
-- 
Michal Hocko
SUSE Labs

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