Re: [PATCH 0/2] don't use mapcount() to check large folio sharing

On Sat, 29 Jul 2023 00:13:54 +0800 Yin Fengwei fengwei.yin@intel.com wrote:

In madvise_cold_or_pageout_pte_range() and madvise_free_pte_range(), folio_mapcount() is used to check whether the folio is shared. But it's not correct as folio_mapcount() returns total mapcount of large folio.

Use folio_estimated_sharers() here as the estimated number is enough.

What are the user-visible runtime effects of these changes?

(and please try to avoid using the same Subject: for different patches)