On Thu 23-01-20 07:38:51, Yang Shi wrote:
Since commit a49bd4d71637 ("mm, numa: rework do_pages_move"), the semantic of move_pages() was changed to return the number of non-migrated pages (failed to migration) and the call would be aborted immediately if migrate_pages() returns positive value. But it didn't report the number of pages that we even haven't attempted to migrate. So, fix it by including non-attempted pages in the return value.
I would rephrased the changelog like this " Since commit 49bd4d71637 ("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. "
Fixes: a49bd4d71637 ("mm, numa: rework do_pages_move") Suggested-by: Michal Hocko mhocko@suse.com Cc: Wei Yang richardw.yang@linux.intel.com Cc: stable@vger.kernel.org [4.17+] Signed-off-by: Yang Shi yang.shi@linux.alibaba.com
With a more clarification, feel free to add Acked-by: Michal Hocko mhocko@suse.com
v2: Rebased on top of the latest mainline kernel per Andrew
mm/migrate.c | 24 ++++++++++++++++++++++-- 1 file changed, 22 insertions(+), 2 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c index 86873b6..9b8eb5d 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1627,8 +1627,18 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, 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 incude the rest of the* nr_pages that have not 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 +1669,11 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, 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;}@@ -1674,6 +1687,13 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes, /* 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 there is not non-attempted* page.* - If the above loop is aborted to it means more fatal error* happened, should return err.*/-- 1.8.3.1