Correct the migration stats for hugetlb with using compound_nr() instead
of thp_nr_pages(), meanwhile change 'nr_failed_pages' to record the
number of normal pages failed to migrate, including THP and hugetlb,
and 'nr_succeeded' will record the number of normal pages migrated
successfully.
Reviewed-by: Zi Yan <ziy@xxxxxxxxxx>
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index 9aafdab..756190b 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1436,9 +1436,9 @@ static inline int try_split_thp(struct page *page, struct page **page2,
* It is caller's responsibility to call putback_movable_pages() to return pages
* to the LRU or free list only if ret != 0.
*
- * Returns the number of {normal page, THP} that were not migrated, or an error code.
- * The number of THP splits will be considered as the number of non-migrated THP,
- * no matter how many subpages of the THP are migrated successfully.
+ * Returns the number of {normal page, THP, hugetlb} that were not migrated, or
+ * an error code. The number of THP splits will be considered as the number of
+ * non-migrated THP, no matter how many subpages of the THP are migrated successfully.
*/
int migrate_pages(struct list_head *from, new_page_t get_new_page,
free_page_t put_new_page, unsigned long private,
@@ -1481,7 +1481,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
* during migration.
*/
is_thp = PageTransHuge(page) && !PageHuge(page);
- nr_subpages = thp_nr_pages(page);
+ nr_subpages = compound_nr(page);
cond_resched();
if (PageHuge(page))
@@ -1530,7 +1530,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
/* Hugetlb migration is unsupported */
if (!no_subpage_counting)
nr_failed++;
- nr_failed_pages++;
+ nr_failed_pages += nr_subpages;
break;
case -ENOMEM:
/*
@@ -1551,7 +1551,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
if (!no_subpage_counting)
nr_failed++;
- nr_failed_pages++;
+ nr_failed_pages += nr_subpages;
goto out;
case -EAGAIN:
if (is_thp) {
@@ -1561,12 +1561,11 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
retry++;
break;
case MIGRATEPAGE_SUCCESS:
+ nr_succeeded += nr_subpages;
if (is_thp) {
nr_thp_succeeded++;
- nr_succeeded += nr_subpages;
break;
}
- nr_succeeded++;
break;
default:
/*
@@ -1583,7 +1582,7 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
if (!no_subpage_counting)
nr_failed++;
- nr_failed_pages++;
+ nr_failed_pages += nr_subpages;
break;
}
}
--
1.8.3.1
