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The added MIGRATE_NO_COPY will be used by the following patches to implement batched page copy functions by skipping folio copy process in __migrate_folio() and copying folios in one shot at the end. Signed-off-by: Zi Yan Signed-off-by: Shivank Garg --- include/linux/migrate_mode.h | 2 ++ mm/migrate.c | 8 +++++--- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/include/linux/migrate_mode.h b/include/linux/migrate_mode.h index 265c4328b36a..9af6c949a057 100644 --- a/include/linux/migrate_mode.h +++ b/include/linux/migrate_mode.h @@ -7,11 +7,13 @@ * on most operations but not ->writepage as the potential stall time * is too significant * MIGRATE_SYNC will block when migrating pages + * MIGRATE_NO_COPY will not copy page content */ enum migrate_mode { MIGRATE_ASYNC, MIGRATE_SYNC_LIGHT, MIGRATE_SYNC, + MIGRATE_NO_COPY, }; enum migrate_reason { diff --git a/mm/migrate.c b/mm/migrate.c index ad03e7257847..3fe78ecb146a 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -848,9 +848,11 @@ static int __migrate_folio(struct address_space *mapping, struct folio *dst, if (folio_ref_count(src) != expected_count) return -EAGAIN; - rc = folio_mc_copy(dst, src); - if (unlikely(rc)) - return rc; + if (mode != MIGRATE_NO_COPY) { + rc = folio_mc_copy(dst, src); + if (unlikely(rc)) + return rc; + } rc = __folio_migrate_mapping(mapping, dst, src, expected_count); if (rc != MIGRATEPAGE_SUCCESS) -- 2.43.0