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authorWei Yang <richardw.yang@linux.intel.com>2020-04-06 20:04:18 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-04-07 10:43:38 -0700
commitd08221a0807b0489f0081476bcd36da88722560b (patch)
tree84f3e534a2b86459650302e67faa34150d7ab9e5 /mm/migrate.c
parent5d7ae891cdc68f30e8b6db35bbd7f0b1aeee189c (diff)
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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@redhat.com rephrase changelog] Signed-off-by: Wei Yang <richardw.yang@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: David Hildenbrand <david@redhat.com> Acked-by: Michal Hocko <mhocko@suse.com> Link: http://lkml.kernel.org/r/20200214003017.25558-5-richardw.yang@linux.intel.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/migrate.c')
-rw-r--r--mm/migrate.c14
1 files changed, 6 insertions, 8 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index 80eaa99bed39..c550230664b1 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1683,18 +1683,16 @@ static int do_pages_move(struct mm_struct *mm, nodemask_t task_nodes,
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;