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 ZrrIzkYT cMx79p5B1McTvrO+gtejCBoC0iFMn7+QoPFKR4Yx5dI9xbgOzw4Fb8OG34aXzzXEtJo1DxvWuPVKynmRo/6nDau5kPjZb3ZM+YV2NDC6kZg2hmN3PJ+rZP0/jHCbsdwzbhmO/8Rzs/+gMWF9Yd7KWhOcFdcUBqdpg0BHUKVbmeUJ6UC5NI2vhTEXgbDkDzX/MPu34xWQSBZTIwzbNxVVy8SnGo3XUW8M3bDIyG8RfLXtsX/YGfkSq2QEHGDkO+nxj3hhApklFihOaX7vuLq7VjxKn9Yxo9NfNHaNye1mMmt6g6bfkUYT+cHJIrrYdxd23d5qBJwWT/U/40UoxYdnKm/8srsgz6KRGw15imCdmvQ2cojXu1WaTUqwI3qDNzbG+dzuhkgjb8cI+3VMV5W3uwlAlyg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu Aug 20, 2026 at 7:55 PM EDT, Yeoreum Yun wrote: > On Thu, Aug 20, 2026 at 07:37:29PM -0400, Zi Yan wrote: >> On Thu Aug 20, 2026 at 5:23 PM EDT, Yeoreum Yun wrote: >> > On Thu, Aug 20, 2026 at 03:51:34PM -0400, Zi Yan wrote: >> >> On Thu Aug 20, 2026 at 3:40 PM EDT, Yeoreum Yun wrote: >> >> > There're some random failure for split_huge_page_test when khugepag= ed >> >> > collapses pages into pmd again which had split by the test. >> >> > >> >> > Prevent the khugepaged's collapses for split page by setting the >> >> > mapped pmd-huge-page with MADV_NOHUGEPAGE before split. >> >>=20 >> >> Why not disable khugepaged using APIs from hugepage_setting.h? >> > >> > Well, this also works with hugepage_save_settings() and write the >> > khugepaged/scan_sleep_millisecs with the maximum integer. >> > >> > I don't have a strong opinion but since it seems more hackish way to >> > change scan_sllep_millisecs, I use madvise() with MADV_NOHUGEPATE. >> > >> > Would it be better to change using APIs in hugepage_setting,h? >>=20 >> No. I did not realize there is no way of stopping khugepaged completely. >>=20 >> BTW, I am curious about your khugepaged config causing this issue. >> IIRC, khugepaged scan interval is about minutes and >> the time between madvise(MADV_HUGEPAGE) and the second >> is_backed_by_folio() should not be that long. > > Yes. it's relly timing sensitive and I've failed to reproduce in the > real hardware. but in the emulation environment it often failed with=20 > the scan_sllep_millisecs as 10 seconds while the test running. Oh, it happened in the emulation environment. That makes sense. > >>=20 >> For your patch, maybe you want to check the return value of madvise() to >> make sure it succeeds. > > Yeap. but it seems enough just worning message for the madvise() with > MADV_NOHUGEPAGE. Yes, since there are huge page checks right after MADV_HUGEPAGE ones. > >>=20 >> Otherwise, >>=20 >> feel free to add >>=20 >> Reviewed-by: Zi Yan > > Thanks! --=20 Best Regards, Yan, Zi