From: Waiman Long on gitlab.com https://gitlab.com/cki-project/kernel-ark/-/merge_requests/3650#note_2316901786 According to the patch series: ``` Patch series "synchronously scan and reclaim empty user PTE pages", v4. Previously, we tried to use a completely asynchronous method to reclaim empty user PTE pages [1]. After discussing with David Hildenbrand, we decided to implement synchronous reclaimation in the case of madvise(MADV_DONTNEED) as the first step. So this series aims to synchronously free the empty PTE pages in madvise(MADV_DONTNEED) case. We will detect and free empty PTE pages in zap_pte_range(), and will add zap_details.reclaim_pt to exclude cases other than madvise(MADV_DONTNEED). ``` So the use case is rather limited for the time being. This is a new feature and one can always consider a new feature as a behavioral change. Are you worrying this new feature may have a performance impact on some generic mm benchmark? Again this is kernel-ark where new upstream features and functionalities are being tried out. The Kconfig change is for RHEL11 which is still about 3 years away. If we disable a new feature because it may have a performance impact, we may never know if that is really the case. -- _______________________________________________ kernel mailing list -- kernel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to kernel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/kernel@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
