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Subject[PATCH 3/7] migrate_pages(): fix THP failure counting for -ENOMEM
Date
In unmap_and_move(), if the new THP cannot be allocated, -ENOMEM will
be returned, and migrate_pages() will try to split the THP unless
"reason" is MR_NUMA_MISPLACED (that is, nosplit == true). But when
nosplit == true, the THP migration failure will not be counted. This
is incorrect. So in this patch, the THP migration failure will be
counted for -ENOMEM regardless of nosplit is true or false. The
nr_failed counting is fixed too, although that is not used actually.

Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Fixes: 5984fabb6e82 ("mm: move_pages: report the number of non-attempted pages")
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Zi Yan <ziy@nvidia.com>
Cc: Yang Shi <shy828301@gmail.com>
---
mm/migrate.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/mm/migrate.c b/mm/migrate.c
index 82444e7df9f1..542533e4e3cf 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1425,11 +1425,11 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
/*
* When memory is low, don't bother to try to migrate
* other pages, just exit.
- * THP NUMA faulting doesn't split THP to retry.
*/
- if (is_thp && !nosplit) {
+ if (is_thp) {
nr_thp_failed++;
- if (!try_split_thp(page, &thp_split_pages)) {
+ /* THP NUMA faulting doesn't split THP to retry. */
+ if (!nosplit && !try_split_thp(page, &thp_split_pages)) {
nr_thp_split++;
goto retry;
}
@@ -1446,6 +1446,8 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
*/
list_splice_init(&thp_split_pages, from);
nr_thp_failed += thp_retry;
+ if (!no_subpage_counting)
+ nr_failed += retry;
goto out;
case -EAGAIN:
if (is_thp)
--
2.30.2
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