@@ -1627,8 +1627,19 @@ static int do_pages_move(struct mm_struc
start = i;
} else if (node != current_node) {
err = do_move_pages_to_node(mm, &pagelist, current_node);
- if (err)
+ if (err) {
+ /*
+ * Positive err means the number of failed
+ * pages to migrate. Since we are going to
+ * abort and return the number of non-migrated
+ * pages, so need to incude the rest of the
+ * nr_pages that have not been attempted as
+ * well.
+ */
+ if (err > 0)
+ err += nr_pages - i - 1;
goto out;
+ }
err = store_status(status, start, current_node, i - start);
if (err)
goto out;
@@ -1659,8 +1670,11 @@ static int do_pages_move(struct mm_struc
goto out_flush;
err = do_move_pages_to_node(mm, &pagelist, current_node);
- if (err)
+ if (err) {
+ if (err > 0)
+ err += nr_pages - i - 1;
goto out;
+ }
if (i > start) {
err = store_status(status, start, current_node, i - start);
if (err)
@@ -1674,6 +1688,13 @@ out_flush:
/* Make sure we do not overwrite the existing error */
err1 = do_move_pages_to_node(mm, &pagelist, current_node);
+ /*
+ * Don't have to report non-attempted pages here since:
+ * - If the above loop is done gracefully all pages have been
+ * attempted.
+ * - If the above loop is aborted it means a fatal error
+ * happened, should return ret.
+ */
if (!err1)
err1 = store_status(status, start, current_node, i - start);
if (err >= 0)
The patch titled Subject: mm: move_pages: report the number of non-attempted pages has been added to the -mm tree. Its filename is mm-move_pages-report-the-number-of-non-attempted-pages.patch This patch should soon appear at http://ozlabs.org/~akpm/mmots/broken-out/mm-move_pages-report-the-number-of-non-attempted-pages.patch and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-move_pages-report-the-number-of-non-attempted-pages.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Yang Shi <yang.shi@linux.alibaba.com> Subject: mm: move_pages: report the number of non-attempted pages Since commit a49bd4d71637 ("mm, numa: rework do_pages_move"), the semantic of move_pages() has changed to return the number of non-migrated pages if they were result of a non-fatal reasons (usually a busy page). This was an unintentional change that hasn't been noticed except for LTP tests which checked for the documented behavior. There are two ways to go around this change. We can even get back to the original behavior and return -EAGAIN whenever migrate_pages is not able to migrate pages due to non-fatal reasons. Another option would be to simply continue with the changed semantic and extend move_pages documentation to clarify that -errno is returned on an invalid input or when migration simply cannot succeed (e.g. -ENOMEM, -EBUSY) or the number of pages that couldn't have been migrated due to ephemeral reasons (e.g. page is pinned or locked for other reasons). This patch implements the second option because this behavior is in place for some time without anybody complaining and possibly new users depending on it. Also it allows to have a slightly easier error handling as the caller knows that it is worth to retry when err > 0. But since the new semantic would be aborted immediately if migration is failed due to ephemeral reasons, need include the number of non-attempted pages in the return value too. Link: http://lkml.kernel.org/r/1580160527-109104-1-git-send-email-yang.shi@linux.alibaba.com Fixes: a49bd4d71637 ("mm, numa: rework do_pages_move") Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com> Suggested-by: Michal Hocko <mhocko@suse.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Wei Yang <richardw.yang@linux.intel.com> Cc: <stable@vger.kernel.org> [4.17+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> --- mm/migrate.c | 25 +++++++++++++++++++++++-- 1 file changed, 23 insertions(+), 2 deletions(-)