On Tue, Jan 11, 2022 at 10:31:21AM +0530, Anshuman Khandual wrote: > > > 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 ? Yes if you like the idea. I think that some events listed below can be grouped into one tracepoint event with showing args like pgsize or read/write flags (or implementation detail is up to you). > > 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
