On 1/11/22 7:28 AM, Naoya Horiguchi wrote: > Hi Anshuman, > > On Fri, Jan 07, 2022 at 10:29:35AM +0530, Anshuman Khandual wrote: >> This adds two trace events for PMD based THP migration without split. These >> events closely follow the implementation details like setting and removing >> of PMD migration entries, which are essential operations for THP migration. > > I often want to check which individual pages are migrated to which places > (or not migrated) for testing, so these new tracepoints could help me. > Maybe these can be much greater if they can handle other types of page > migration for raw pages and hugetlb pages. Is it hard to cover all such > page migration events? Are you suggesting to cover all migration entry transitions for normal and HugeTLB pages as well ? migrate_pages() unmap_and_move_huge_page() try_to_migrate() make_writable_migration_entry() <--- make_readable_migration_entry() <--- remove_migration_ptes() <--- unmap_and_move() __unmap_and_move() try_to_migrate() make_writable_migration_entry() <--- make_readable_migration_entry() <--- remove_migration_ptes() <--- > > Thanks, > Naoya Horiguchi >
