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 @@ -8800,7 +8800,8 @@ 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; } _
