The patch titled
Subject: mm: page_alloc: dump migrate-failed pages only at -EBUSY
has been added to the -mm tree. Its filename is
mm-page_alloc-dump-migrate-failed-pages-only-at-ebusy.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-dump-migrate-failed-pages-only-at-ebusy.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-page_alloc-dump-migrate-failed-pages-only-at-ebusy.patch
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------------------------------------------------------
From: Minchan Kim <minchan@xxxxxxxxxx>
Subject: mm: page_alloc: dump migrate-failed pages only at -EBUSY
alloc_contig_dump_pages() aims for helping debugging page migration
failure by elevated page refcount compared to expected_count. (for the
detail, please look at migrate_page_move_mapping)
However, -ENOMEM is just the case that system is under memory pressure
state, not relevant with page refcount at all. Thus, the dumping page
list is not helpful for the debugging point of view.
Link: https://lkml.kernel.org/r/YKa2Wyo9xqIErpfa@xxxxxxxxxx
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <david@xxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Cc: John Dias <joaodias@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/mm/page_alloc.c~mm-page_alloc-dump-migrate-failed-pages-only-at-ebusy
+++ a/mm/page_alloc.c
@@ -8763,7 +8763,8 @@ static int __alloc_contig_migrate_range(
lru_cache_enable();
if (ret < 0) {
- alloc_contig_dump_pages(&cc->migratepages);
+ if (ret == -EBUSY)
+ alloc_contig_dump_pages(&cc->migratepages);
putback_movable_pages(&cc->migratepages);
return ret;
}
_
Patches currently in -mm which might be from minchan@xxxxxxxxxx are
mm-page_alloc-dump-migrate-failed-pages-only-at-ebusy.patch
