Matthew Wilcox (Oracle) wrote on Wed, Apr 02, 2025 at 03:59:55PM +0100:
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
Given I'm not in Cc of the whole series I'm lacking context but I assume that means I'm not supposed to take this in.
I won't pretend I understand folios anyway, but commit messages makes sense to me: Acked-by: Dominique Martinet asmadeus@codewreck.org
Thanks,