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authorZi Yan <ziy@nvidia.com>2020-09-25 21:19:14 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-09-26 10:33:57 -0700
commit6c5c7b9f3352728af490183f71d350bb658ffb75 (patch)
tree5442c016dc981a8c277fda37495f532c60a88c48
parentd3f7b1bb204099f2f7306318896223e8599bb6a2 (diff)
mm/migrate: correct thp migration stats
PageTransHuge returns true for both thp and hugetlb, so thp stats was counting both thp and hugetlb migrations. Exclude hugetlb migration by setting is_thp variable right. Clean up thp handling code too when we are there. Fixes: 1a5bae25e3cf ("mm/vmstat: add events for THP migration without split") Signed-off-by: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com> Cc: Anshuman Khandual <anshuman.khandual@arm.com> Link: https://lkml.kernel.org/r/20200917210413.1462975-1-zi.yan@sent.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/migrate.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index aecb1433cf3c..04a98bb2f568 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1446,7 +1446,7 @@ retry:
* Capture required information that might get lost
* during migration.
*/
- is_thp = PageTransHuge(page);
+ is_thp = PageTransHuge(page) && !PageHuge(page);
nr_subpages = thp_nr_pages(page);
cond_resched();
@@ -1472,7 +1472,7 @@ retry:
* we encounter them after the rest of the list
* is processed.
*/
- if (PageTransHuge(page) && !PageHuge(page)) {
+ if (is_thp) {
lock_page(page);
rc = split_huge_page_to_list(page, from);
unlock_page(page);
@@ -1481,8 +1481,7 @@ retry:
nr_thp_split++;
goto retry;
}
- }
- if (is_thp) {
+
nr_thp_failed++;
nr_failed += nr_subpages;
goto out;