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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@google.com
Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: John Dias <joaodias@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Minchan Kim 2021-06-28 19:42:06 -07:00 committed by Linus Torvalds
parent 902499937e
commit 151e084af4
1 changed files with 2 additions and 1 deletions
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3
mm/page_alloc.c
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@ -8800,7 +8800,8 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
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;
}