On Thu, Jan 15, 2026 at 10:19:50AM +0100, David Hildenbrand (Red Hat) wrote: > I started with wanting to remove the dependency of the balloon > infrastructure on the page lock, but ended up performing various other > cleanups, some of which I had on my todo list for years. > > This series heavily cleans up and simplifies our balloon infrastructure, > including our balloon page migration functionality. > > With this series, we no longer make use of the page lock for PageOffline > pages as part of the balloon infrastructure (preparing for memdescs > where PageOffline pages won't have any such lock), and simplifies > migration handling such that refcounting can more easily be adjusted > later (long-term focus is for PageOffline pages to not have a refcount > either). > > Plenty of related cleanups. > > Heavily compile-tested and heavily runtime-tested with virtio-balloon. > PPC CMM and the VMware balloon are untested and I'd appreciate a helping > hand from people that have suitable environments. > > Not CCing maintainers for the vmscan.c and migrate.c change as they > are rather trivial and I don't want to patchbomb them.
besides MAINTAINERS thing: Acked-by: Michael S. Tsirkin <[email protected]> > -- > > This is based on mm/mm-unstable. > > v1 -> v2: > * Rebased to latest mm/mm-unstable without any conflicts > * Minor patch description/subject and comment fixups > * Retested > > Cc: Andrew Morton <[email protected]> > Cc: Oscar Salvador <[email protected]> > Cc: Lorenzo Stoakes <[email protected]> > Cc: "Liam R. Howlett" <[email protected]> > Cc: Vlastimil Babka <[email protected]> > Cc: Mike Rapoport <[email protected]> > Cc: Suren Baghdasaryan <[email protected]> > Cc: Michal Hocko <[email protected]> > Cc: Jonathan Corbet <[email protected]> > Cc: Madhavan Srinivasan <[email protected]> > Cc: Michael Ellerman <[email protected]> > Cc: Nicholas Piggin <[email protected]> > Cc: Christophe Leroy <[email protected]> > Cc: Arnd Bergmann <[email protected]> > Cc: Greg Kroah-Hartman <[email protected]> > Cc: Jerrin Shaji George <[email protected]> > Cc: "Michael S. Tsirkin" <[email protected]> > Cc: Jason Wang <[email protected]> > Cc: Xuan Zhuo <[email protected]> > Cc: "Eugenio Pérez" <[email protected]> > Cc: Zi Yan <[email protected]> > > David Hildenbrand (Red Hat) (23): > vmw_balloon: adjust BALLOON_DEFLATE when deflating while migrating > vmw_balloon: remove vmballoon_compaction_init() > powerpc/pseries/cmm: remove cmm_balloon_compaction_init() > mm/balloon_compaction: centralize basic page migration handling > mm/balloon_compaction: centralize adjust_managed_page_count() handling > vmw_balloon: stop using the balloon_dev_info lock > mm/balloon_compaction: use a device-independent balloon (list) lock > mm/balloon_compaction: remove dependency on page lock > mm/balloon_compaction: make balloon_mops static > mm/balloon_compaction: drop fs.h include from balloon_compaction.h > drivers/virtio/virtio_balloon: stop using balloon_page_push/pop() > mm/balloon_compaction: remove balloon_page_push/pop() > mm/balloon_compaction: fold balloon_mapping_gfp_mask() into > balloon_page_alloc() > mm/balloon_compaction: move internal helpers to balloon_compaction.c > mm/balloon_compaction: assert that the balloon_pages_lock is held > mm/balloon_compaction: mark remaining functions for having proper > kerneldoc > mm/balloon_compaction: remove "extern" from functions > mm/vmscan: drop inclusion of balloon_compaction.h > mm: rename balloon_compaction.(c|h) to balloon.(c|h) > mm/kconfig: make BALLOON_COMPACTION depend on MIGRATION > mm: rename CONFIG_BALLOON_COMPACTION to CONFIG_BALLOON_MIGRATION > mm: rename CONFIG_MEMORY_BALLOON -> CONFIG_BALLOON > MAINTAINERS: move memory balloon infrastructure to "MEMORY MANAGEMENT > - BALLOON" > > .../admin-guide/mm/memory-hotplug.rst | 8 +- > Documentation/core-api/mm-api.rst | 2 +- > MAINTAINERS | 12 +- > arch/powerpc/platforms/pseries/Kconfig | 2 +- > arch/powerpc/platforms/pseries/cmm.c | 53 +---- > drivers/misc/Kconfig | 2 +- > drivers/misc/vmw_balloon.c | 105 +++------- > drivers/virtio/Kconfig | 2 +- > drivers/virtio/virtio_balloon.c | 64 ++---- > include/linux/balloon.h | 77 +++++++ > include/linux/balloon_compaction.h | 160 --------------- > include/linux/vm_event_item.h | 8 +- > mm/Kconfig | 23 +-- > mm/Makefile | 2 +- > mm/{balloon_compaction.c => balloon.c} | 194 +++++++++++++----- > mm/memory_hotplug.c | 4 +- > mm/migrate.c | 2 +- > mm/vmscan.c | 1 - > mm/vmstat.c | 8 +- > 19 files changed, 314 insertions(+), 415 deletions(-) > create mode 100644 include/linux/balloon.h > delete mode 100644 include/linux/balloon_compaction.h > rename mm/{balloon_compaction.c => balloon.c} (59%) > > > base-commit: f8ed52ac0cfbddff992bb9600941bfe51e1e385a > -- > 2.52.0
