From: David Hildenbrand david@redhat.com
[ Upstream commit fb05f992b6bbb4702307d96f00703ee637b24dbf ]
Patch series "mm/migration: rework movable_ops page migration (part 1)", v2.
In the future, as we decouple "struct page" from "struct folio", pages that support "non-lru page migration" -- movable_ops page migration such as memory balloons and zsmalloc -- will no longer be folios. They will not have ->mapping, ->lru, and likely no refcount and no page lock. But they will have a type and flags 🙂
This is the first part (other parts not written yet) of decoupling movable_ops page migration from folio migration.
In this series, we get rid of the ->mapping usage, and start cleaning up the code + separating it from folio migration.
Migration core will have to be further reworked to not treat movable_ops pages like folios. This is the first step into that direction.
This patch (of 29):
The core will set PG_isolated only after mops->isolate_page() was called. In case of the balloon, that is where we will remove it from the balloon list. So we cannot have isolated pages in the balloon list.
Let's drop this unnecessary check.
Link: https://lkml.kernel.org/r/20250704102524.326966-2-david@redhat.com Signed-off-by: David Hildenbrand david@redhat.com Acked-by: Zi Yan ziy@nvidia.com Reviewed-by: Lorenzo Stoakes lorenzo.stoakes@oracle.com Cc: Alistair Popple apopple@nvidia.com Cc: Al Viro viro@zeniv.linux.org.uk Cc: Arnd Bergmann arnd@arndb.de Cc: Brendan Jackman jackmanb@google.com Cc: Byungchul Park byungchul@sk.com Cc: Chengming Zhou chengming.zhou@linux.dev Cc: Christian Brauner brauner@kernel.org Cc: Christophe Leroy christophe.leroy@csgroup.eu Cc: Eugenio Pé rez eperezma@redhat.com Cc: Greg Kroah-Hartman gregkh@linuxfoundation.org Cc: Gregory Price gourry@gourry.net Cc: "Huang, Ying" ying.huang@linux.alibaba.com Cc: Jan Kara jack@suse.cz Cc: Jason Gunthorpe jgg@ziepe.ca Cc: Jason Wang jasowang@redhat.com Cc: Jerrin Shaji George jerrin.shaji-george@broadcom.com Cc: Johannes Weiner hannes@cmpxchg.org Cc: John Hubbard jhubbard@nvidia.com Cc: Jonathan Corbet corbet@lwn.net Cc: Joshua Hahn joshua.hahnjy@gmail.com Cc: Liam Howlett liam.howlett@oracle.com Cc: Madhavan Srinivasan maddy@linux.ibm.com Cc: Mathew Brost matthew.brost@intel.com Cc: Matthew Wilcox (Oracle) willy@infradead.org Cc: Miaohe Lin linmiaohe@huawei.com Cc: Michael Ellerman mpe@ellerman.id.au Cc: "Michael S. Tsirkin" mst@redhat.com Cc: Michal Hocko mhocko@suse.com Cc: Mike Rapoport rppt@kernel.org Cc: Minchan Kim minchan@kernel.org Cc: Naoya Horiguchi nao.horiguchi@gmail.com Cc: Nicholas Piggin npiggin@gmail.com Cc: Oscar Salvador osalvador@suse.de Cc: Peter Xu peterx@redhat.com Cc: Qi Zheng zhengqi.arch@bytedance.com Cc: Rakie Kim rakie.kim@sk.com Cc: Rik van Riel riel@surriel.com Cc: Sergey Senozhatsky senozhatsky@chromium.org Cc: Shakeel Butt shakeel.butt@linux.dev Cc: Suren Baghdasaryan surenb@google.com Cc: Vlastimil Babka vbabka@suse.cz Cc: Xuan Zhuo xuanzhuo@linux.alibaba.com Cc: xu xin xu.xin16@zte.com.cn Cc: Harry Yoo harry.yoo@oracle.com Signed-off-by: Andrew Morton akpm@linux-foundation.org Stable-dep-of: 0da2ba35c0d5 ("powerpc/pseries/cmm: adjust BALLOON_MIGRATE when migrating pages") Signed-off-by: Sasha Levin sashal@kernel.org --- mm/balloon_compaction.c | 6 ------ 1 file changed, 6 deletions(-)
diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c index 22c96fed70b5..dafb7dc90cfd 100644 --- a/mm/balloon_compaction.c +++ b/mm/balloon_compaction.c @@ -93,12 +93,6 @@ size_t balloon_page_list_dequeue(struct balloon_dev_info *b_dev_info, if (!trylock_page(page)) continue;
- if (IS_ENABLED(CONFIG_BALLOON_COMPACTION) && - PageIsolated(page)) { - /* raced with isolation */ - unlock_page(page); - continue; - } balloon_page_delete(page); __count_vm_event(BALLOON_DEFLATE); list_add(&page->lru, pages);