The patch titled
Subject: mm/migrate: transfer PG_dropbehind to the new folio
has been added to the -mm mm-unstable branch. Its filename is
mm-migrate-transfer-pg_dropbehind-to-the-new-folio.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-migrate-transfer-pg_dropbehind-to-the-new-folio.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: mm/migrate: transfer PG_dropbehind to the new folio
Date: Thu, 30 Jan 2025 12:00:39 +0200
Patch series "Get rid of PG_reclaim and rename PG_dropbehind", v3.
Use PG_dropbehind instead of PG_reclaim and remove PG_reclaim.
After removing PG_relcaim, PG_readahead is exclusive user of the page
flag bit.
Once PG_reclaim is gone, we can rename PG_dropbehind to PG_reclaim.
This patch (of 11):
Do not lose the flag on page migration.
Ideally, these folios should be freed instead of migration. But it
requires to find right spot do this and proper testing.
Transfer the flag for now.
Link: https://lkml.kernel.org/r/20250130100050.1868208-1-kirill.shutemov@xxxxxxxxxxxxxxx
Link: https://lkml.kernel.org/r/20250130100050.1868208-2-kirill.shutemov@xxxxxxxxxxxxxxx
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Acked-by: Yu Zhao <yuzhao@xxxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
Cc: Chengming Zhou <chengming.zhou@xxxxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Cc: Dave Airlie <airlied@xxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
Cc: gehao <gehao@xxxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Jason A. Donenfeld <jason@xxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Jonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Josef Bacik <josef@xxxxxxxxxxxxxx>
Cc: "Masami Hiramatsu (Google)" <mhiramat@xxxxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Mattew Wilcox <willy@xxxxxxxxxxxxx> [English fixes]
Cc: Miklos Szeredi <miklos@xxxxxxxxxx>
Cc: Nhat Pham <nphamcs@xxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Ran Xiaokai <ran.xiaokai@xxxxxxxxxx>
Cc: Tvrtko Ursulin <tursulin@xxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Yosry Ahmed <yosryahmed@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 4 ++++
1 file changed, 4 insertions(+)
--- a/mm/migrate.c~mm-migrate-transfer-pg_dropbehind-to-the-new-folio
+++ a/mm/migrate.c
@@ -682,6 +682,10 @@ void folio_migrate_flags(struct folio *n
if (folio_test_dirty(folio))
folio_set_dirty(newfolio);
+ /* TODO: free the folio on migration? */
+ if (folio_test_dropbehind(folio))
+ folio_set_dropbehind(newfolio);
+
if (folio_test_young(folio))
folio_set_young(newfolio);
if (folio_test_idle(folio))
_
Patches currently in -mm which might be from kirill.shutemov@xxxxxxxxxxxxxxx are
mm-migrate-transfer-pg_dropbehind-to-the-new-folio.patch
drm-i915-gem-convert-__shmem_writeback-to-folios.patch
drm-i915-gem-use-pg_dropbehind-instead-of-pg_reclaim.patch
mm-zswap-use-pg_dropbehind-instead-of-pg_reclaim.patch
mm-truncate-use-folio_set_dropbehind-instead-of-deactivate_file_folio.patch
mm-vmscan-use-pg_dropbehind-instead-of-pg_reclaim.patch
mm-vmscan-use-pg_dropbehind-instead-of-pg_reclaim-in-shrink_folio_list.patch
mm-mglru-check-pg_dropbehind-instead-of-pg_reclaim-in-lru_gen_folio_seq.patch
mm-remove-pg_reclaim.patch
mm-vmscan-do-not-demote-pg_dropbehind-folios.patch
mm-rename-pg_dropbehind-to-pg_reclaim.patch
