The patch titled
Subject: mm/migrate.c: unify "not queued for migration" handling in do_pages_move()
has been added to the -mm tree. Its filename is
mm-migratec-unify-not-queued-for-migration-handling-in-do_pages_move.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-migratec-unify-not-queued-for-migration-handling-in-do_pages_move.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-migratec-unify-not-queued-for-migration-handling-in-do_pages_move.patch
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------------------------------------------------------
From: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
Subject: mm/migrate.c: unify "not queued for migration" handling in do_pages_move()
It can currently happen that we store the status of a page twice:
* Once we detect that it is already on the target node
* Once we moved a bunch of pages, and a page that's already on the
target node is contained in the current interval.
Let's simplify the code and always call do_move_pages_to_node() in case we
did not queue a page for migration. Note that pages that are already on
the target node are not added to the pagelist and are, therefore, ignored
by do_move_pages_to_node() - there is no functional change.
The status of such a page is now only stored once.
[david@xxxxxxxxxx rephrase changelog]
Link: http://lkml.kernel.org/r/20200214003017.25558-5-richardw.yang@xxxxxxxxxxxxxxx
Signed-off-by: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)
--- a/mm/migrate.c~mm-migratec-unify-not-queued-for-migration-handling-in-do_pages_move
+++ a/mm/migrate.c
@@ -1664,18 +1664,16 @@ static int do_pages_move(struct mm_struc
err = add_page_for_migration(mm, addr, current_node,
&pagelist, flags & MPOL_MF_MOVE_ALL);
- if (!err) {
- /* The page is already on the target node */
- err = store_status(status, i, current_node, 1);
- if (err)
- goto out_flush;
- continue;
- } else if (err > 0) {
+ if (err > 0) {
/* The page is successfully queued for migration */
continue;
}
- err = store_status(status, i, err, 1);
+ /*
+ * If the page is already on the target node (!err), store the
+ * node, otherwise, store the err.
+ */
+ err = store_status(status, i, err ? : current_node, 1);
if (err)
goto out_flush;
_
Patches currently in -mm which might be from richardw.yang@xxxxxxxxxxxxxxx are
mm-sparsemem-get-address-to-page-struct-instead-of-address-to-pfn.patch
mm-migratec-no-need-to-check-for-i-start-in-do_pages_move.patch
mm-migratec-wrap-do_move_pages_to_node-and-store_status.patch
mm-migratec-check-pagelist-in-move_pages_and_store_status.patch
mm-migratec-unify-not-queued-for-migration-handling-in-do_pages_move.patch
