Re: [PATCH v2 1/9] 9p: Add a migrate_folio method

Matthew Wilcox (Oracle) willy@infradead.org wrote:

The migration code used to be able to migrate dirty 9p folios by writing them back using writepage. When the writepage method was removed, we neglected to add a migrate_folio method, which means that dirty 9p folios have been unmovable ever since. This reduced our success at defragmenting memory on machines which use 9p heavily.

Fixes: 80105ed2fd27 (9p: Use netfslib read/write_iter) Cc: stable@vger.kernel.org Cc: David Howells dhowells@redhat.com Cc: v9fs@lists.linux.dev Signed-off-by: Matthew Wilcox (Oracle) willy@infradead.org

Reviewed-by: David Howells dhowells@redhat.com