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 ZdrWRMd1 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 8/8/2023 10:43 AM, Yu Zhao wrote: > On Mon, Aug 7, 2023 at 8:10 PM Yin Fengwei 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. >> >> >> This patchset will fix the cases: >> User space application call madvise() with MADV_FREE, MADV_COLD and >> MADV_PAGEOUT for specific address range. There are THP mapped to the >> range. Without the patchset, the THP is skipped. With the patch, the >> THP will be split and handled accordingly. >> >> David reported the cow self test skip some cases because of >> MADV_PAGEOUT skip THP: >> https://lore.kernel.org/linux-mm/9e92e42d-488f-47db-ac9d-75b24cd0d037@intel.com/T/#mbf0f2ec7fbe45da47526de1d7036183981691e81 >> and I confirmed this patchset make it work again. >> >> >> Changelog from v1: >> - Avoid two Fixes tags make backport harder. Thank Andrew for pointing >> this out. >> >> - Add note section to mention this is a temporary fix which is fine >> to reduce user-visble effects. For long term fix, we should wait for >> David's solution. Thank Ryan and David for pointing this out. >> >> - Spell user-visible effects out. Then people could decide whether >> these patches are necessary for stable branch. Thank Andrew for >> pointing this out. > > LGTM, thank you. Thanks a lot for looking at this patchset. Regards Yin, Fengwei