The quilt patch titled
Subject: mm: khugepaged: support shmem mTHP copy
has been removed from the -mm tree. Its filename was
mm-khugepaged-support-shmem-mthp-copy.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Subject: mm: khugepaged: support shmem mTHP copy
Date: Tue, 20 Aug 2024 17:49:15 +0800
Iterate each subpage in the large folio to copy, as preparation for
supporting shmem mTHP collapse.
Link: https://lkml.kernel.org/r/222d615b7c837eabb47a238126c5fdeff8aa5283.1724140601.git.baolin.wang@xxxxxxxxxxxxxxxxx
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Cc: Barry Song <21cnbao@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Ryan Roberts <ryan.roberts@xxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Cc: Zi Yan <ziy@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/khugepaged.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
--- a/mm/khugepaged.c~mm-khugepaged-support-shmem-mthp-copy
+++ a/mm/khugepaged.c
@@ -2056,17 +2056,22 @@ xa_unlocked:
index = start;
dst = folio_page(new_folio, 0);
list_for_each_entry(folio, &pagelist, lru) {
+ int i, nr_pages = folio_nr_pages(folio);
+
while (index < folio->index) {
clear_highpage(dst);
index++;
dst++;
}
- if (copy_mc_highpage(dst, folio_page(folio, 0)) > 0) {
- result = SCAN_COPY_MC;
- goto rollback;
+
+ for (i = 0; i < nr_pages; i++) {
+ if (copy_mc_highpage(dst, folio_page(folio, i)) > 0) {
+ result = SCAN_COPY_MC;
+ goto rollback;
+ }
+ index++;
+ dst++;
}
- index++;
- dst++;
}
while (index < end) {
clear_highpage(dst);
_
Patches currently in -mm which might be from baolin.wang@xxxxxxxxxxxxxxxxx are
