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mm: khugepaged: support shmem mTHP copy

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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@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Barry Song <21cnbao@gmail.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Yang Shi <shy828301@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Baolin Wang 2024-08-20 17:49:15 +08:00 committed by Andrew Morton
parent d6b8f296e8
commit dfa98f56d9
1 changed files with 10 additions and 5 deletions
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15
mm/khugepaged.c
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@ -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);