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[2003:d8:2f2d:2400:4052:3b5:fff9:4ed0]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-3a568b18f96sm17611143f8f.66.2025.06.18.10.41.03 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 18 Jun 2025 10:41:04 -0700 (PDT) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linux-doc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, virtualization@lists.linux.dev, linux-fsdevel@vger.kernel.org, David Hildenbrand , Andrew Morton , Jonathan Corbet , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Jerrin Shaji George , Arnd Bergmann , Greg Kroah-Hartman , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Alexander Viro , Christian Brauner , Jan Kara , Zi Yan , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , "Matthew Wilcox (Oracle)" , Minchan Kim , Sergey Senozhatsky , Brendan Jackman , Johannes Weiner , Jason Gunthorpe , John Hubbard , Peter Xu , Xu Xin , Chengming Zhou , Miaohe Lin , Naoya Horiguchi , Oscar Salvador , Rik van Riel , Harry Yoo , Qi Zheng , Shakeel Butt Subject: [PATCH RFC 18/29] mm: remove __folio_test_movable() Date: Wed, 18 Jun 2025 19:40:01 +0200 Message-ID: <20250618174014.1168640-19-david@redhat.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250618174014.1168640-1-david@redhat.com> References: <20250618174014.1168640-1-david@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Convert to page_has_movable_ops(). While at it, cleanup relevant code a bit. The data_race() in migrate_folio_unmap() is questionable: we already hold a page reference, and concurrent modifications can no longer happen (iow: __ClearPageMovable() no longer exists). Drop it for now, we'll rework page_has_movable_ops() soon either way to no longer rely on page->mapping. Wherever we cast from folio to page now is a clear sign that this code has to be decoupled. Signed-off-by: David Hildenbrand Reviewed-by: Zi Yan --- include/linux/page-flags.h | 6 ------ mm/migrate.c | 43 ++++++++++++-------------------------- mm/vmscan.c | 6 ++++-- 3 files changed, 17 insertions(+), 38 deletions(-) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index c67163b73c5ec..4c27ebb689e3c 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -744,12 +744,6 @@ static __always_inline bool PageAnon(const struct page= *page) return folio_test_anon(page_folio(page)); } =20 -static __always_inline bool __folio_test_movable(const struct folio *folio) -{ - return ((unsigned long)folio->mapping & PAGE_MAPPING_FLAGS) =3D=3D - PAGE_MAPPING_MOVABLE; -} - static __always_inline bool page_has_movable_ops(const struct page *page) { return ((unsigned long)page->mapping & PAGE_MAPPING_FLAGS) =3D=3D diff --git a/mm/migrate.c b/mm/migrate.c index 5f97369eac2f9..37e722fbfee70 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -219,12 +219,7 @@ void putback_movable_pages(struct list_head *l) continue; } list_del(&folio->lru); - /* - * We isolated non-lru movable folio so here we can use - * __folio_test_movable because LRU folio's mapping cannot - * have PAGE_MAPPING_MOVABLE. - */ - if (unlikely(__folio_test_movable(folio))) { + if (unlikely(page_has_movable_ops(&folio->page))) { putback_movable_ops_page(&folio->page); } else { node_stat_mod_folio(folio, NR_ISOLATED_ANON + @@ -237,26 +232,20 @@ void putback_movable_pages(struct list_head *l) /* Must be called with an elevated refcount on the non-hugetlb folio */ bool isolate_folio_to_list(struct folio *folio, struct list_head *list) { - bool isolated, lru; - if (folio_test_hugetlb(folio)) return folio_isolate_hugetlb(folio, list); =20 - lru =3D !__folio_test_movable(folio); - if (lru) - isolated =3D folio_isolate_lru(folio); - else - isolated =3D isolate_movable_ops_page(&folio->page, - ISOLATE_UNEVICTABLE); - - if (!isolated) - return false; - - list_add(&folio->lru, list); - if (lru) + if (page_has_movable_ops(&folio->page)) { + if (!isolate_movable_ops_page(&folio->page, + ISOLATE_UNEVICTABLE)) + return false; + } else { + if (!folio_isolate_lru(folio)) + return false; node_stat_add_folio(folio, NR_ISOLATED_ANON + folio_is_file_lru(folio)); - + } + list_add(&folio->lru, list); return true; } =20 @@ -1140,12 +1129,7 @@ static void migrate_folio_undo_dst(struct folio *dst= , bool locked, static void migrate_folio_done(struct folio *src, enum migrate_reason reason) { - /* - * Compaction can migrate also non-LRU pages which are - * not accounted to NR_ISOLATED_*. They can be recognized - * as __folio_test_movable - */ - if (likely(!__folio_test_movable(src)) && reason !=3D MR_DEMOTION) + if (likely(!page_has_movable_ops(&src->page)) && reason !=3D MR_DEMOTION) mod_node_page_state(folio_pgdat(src), NR_ISOLATED_ANON + folio_is_file_lru(src), -folio_nr_pages(src)); =20 @@ -1164,7 +1148,6 @@ static int migrate_folio_unmap(new_folio_t get_new_fo= lio, int rc =3D -EAGAIN; int old_page_state =3D 0; struct anon_vma *anon_vma =3D NULL; - bool is_lru =3D data_race(!__folio_test_movable(src)); bool locked =3D false; bool dst_locked =3D false; =20 @@ -1265,7 +1248,7 @@ static int migrate_folio_unmap(new_folio_t get_new_fo= lio, goto out; dst_locked =3D true; =20 - if (unlikely(!is_lru)) { + if (unlikely(page_has_movable_ops(&dst->page))) { __migrate_folio_record(dst, old_page_state, anon_vma); return MIGRATEPAGE_UNMAP; } @@ -1330,7 +1313,7 @@ static int migrate_folio_move(free_folio_t put_new_fo= lio, unsigned long private, prev =3D dst->lru.prev; list_del(&dst->lru); =20 - if (unlikely(__folio_test_movable(src))) { + if (unlikely(page_has_movable_ops(&src->page))) { rc =3D migrate_movable_ops_page(&dst->page, &src->page, mode); goto out_unlock_both; } diff --git a/mm/vmscan.c b/mm/vmscan.c index efc818a0bbecb..e5d04c98af976 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1651,9 +1651,11 @@ unsigned int reclaim_clean_pages_from_list(struct zo= ne *zone, unsigned int noreclaim_flag; =20 list_for_each_entry_safe(folio, next, folio_list, lru) { + /* TODO: these pages should not even appear in this list. */ + if (page_has_movable_ops(&folio->page)) + continue; if (!folio_test_hugetlb(folio) && folio_is_file_lru(folio) && - !folio_test_dirty(folio) && !__folio_test_movable(folio) && - !folio_test_unevictable(folio)) { + !folio_test_dirty(folio) && !folio_test_unevictable(folio)) { folio_clear_active(folio); list_move(&folio->lru, &clean_folios); } --=20 2.49.0