Re: [PATCH -V2 4/7] migrate_pages(): fix failure counting for THP subpages retrying

From: Oscar Salvador
Date: Mon Jul 11 2022 - 08:13:10 EST

On Mon, Jul 11, 2022 at 04:49:45PM +0800, Huang Ying wrote:
> If THP is failed to be migrated for -ENOSYS and -ENOMEM, the THP will
> be split into thp_split_pages, and after other pages are migrated,
> pages in thp_split_pages will be migrated with no_subpage_counting ==
> true, because its failure have been counted already. If some pages in
> thp_split_pages are retried during migration, we should not count
> their failure if no_subpage_counting == true too. This is done this
> patch to fix the failure counting for THP subpages retrying.
> Signed-off-by: "Huang, Ying" <ying.huang@xxxxxxxxx>
> Fixes: 5984fabb6e82 ("mm: move_pages: report the number of non-attempted pages")
> Reviewed-by: Baolin Wang <>
> Cc: Zi Yan <ziy@xxxxxxxxxx>
> Cc: Yang Shi <shy828301@xxxxxxxxx>

Reviewed-by: Oscar Salvador <osalvador@xxxxxxx>

Oscar Salvador