From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4B8606FC3; Mon, 19 Jan 2026 23:01:41 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768863702; cv=none; b=sBM5ikfki0Ambekgul5BvFcAZqp43HYHZ/FDHqALDzvWBerm1aEEn+0vLv6pAnQJqZ6FfI0q3mAaZ1PLhdpgsohiH9DHXEUviDJA3N+aWPMTA+ur7ibAtkCdffw2ph5ehRZ6NHVhIVv9ut32YRDHxE2lAfYdhHTrlkm2k15RZFA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1768863702; c=relaxed/simple; bh=pkO47DmDTlCVZ4qWJyLDetbEa5q1OzobH5egyxMl/Xc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=Ikk+AVPpMKhw81X0EAHY8O5K4FgH0CgE7u0ehp5lhHXyRjk9LzAW6uG0NJuBoLbmSu7O12Ki/aeJAzH7qcqOcQH5pBkI3MYeuFatCO44OdRc5jvF80czNjziW/zvKrX47WnD6AYReUxP8im+IZ+1raQRsE/I5wPamhedUPRzGbA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RftC9SBk; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="RftC9SBk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 742E9C116C6; Mon, 19 Jan 2026 23:01:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1768863701; bh=pkO47DmDTlCVZ4qWJyLDetbEa5q1OzobH5egyxMl/Xc=; h=From:To:Cc:Subject:Date:From; b=RftC9SBkj9jynEzKvEsWZNv24oX1nY1eTCTvgu0zWx5vcx/TAqUodDraVVJ6yyQlt jFCksuPGdnY0aN7o82O4UUhCSnO7fRapHqehFETIxw94lG3xwNmxThkWvhVpjmrJVQ wTYFG8cXS44T/p0hca8aNArdiOczaKjFXYDb7+rWepH1lGYeEdhZ1E/OjX5iUTgOhQ X6p31FWDuqzbxFyOsxMyhIDYJ9K3ewTKBRlJjOozr+b46wTyLd6JlbJ/6VzIUE3iUN wHQ68zwSdazzPYKx+CNSTQu7vHgT2W1vhN/JK3oCMTxZAiHP4SjR9kWBCQe2s3GmZA CwfqDt2NtDkTg== From: "David Hildenbrand (Red Hat)" To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, Broadcom internal kernel review list , linux-doc@vger.kernel.org, virtualization@lists.linux.dev, "David Hildenbrand (Red Hat)" , Andrew Morton , Oscar Salvador , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jonathan Corbet , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Arnd Bergmann , Greg Kroah-Hartman , Jerrin Shaji George , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Zi Yan Subject: [PATCH v3 00/24] mm: balloon infrastructure cleanups Date: Tue, 20 Jan 2026 00:01:08 +0100 Message-ID: <20260119230133.3551867-1-david@kernel.org> X-Mailer: git-send-email 2.52.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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. -- v2 -> v3: * "mm/balloon_compaction: centralize basic page migration handling" -> Remove newline -> Talk about "page" instead of "old page" -> avoid the switch statement * "mm/balloon_compaction: move internal helpers to balloon_compaction.c" -> No need to carry over the "inline" * "fixup mm: rename CONFIG_BALLOON_COMPACTION to CONFIG_BALLOON_MIGRATION -> Remove some more "balloon page compaction" thingies * "MAINTAINERS: move memory balloon infrastructure to "MEMORY MANAGEMENT - BALLOON" -> CC the virt list and use the proper mail address * "mm/balloon_compaction: improve comments for WARN_ON_ONCE(!b_dev_info) -> Added v1 -> v2: * Rebased to latest mm/mm-unstable without any conflicts * Minor patch description/subject and comment fixups * Retested Cc: Andrew Morton Cc: Oscar Salvador Cc: Lorenzo Stoakes Cc: "Liam R. Howlett" Cc: Vlastimil Babka Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Michal Hocko Cc: Jonathan Corbet Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Cc: Arnd Bergmann Cc: Greg Kroah-Hartman Cc: Jerrin Shaji George Cc: "Michael S. Tsirkin" Cc: Jason Wang Cc: Xuan Zhuo Cc: "Eugenio Pérez" Cc: Zi Yan David Hildenbrand (Red Hat) (24): 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: improve comments for WARN_ON_ONCE(!b_dev_info) 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 | 13 +- 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} | 200 ++++++++++++------ mm/memory_hotplug.c | 4 +- mm/migrate.c | 2 +- mm/vmscan.c | 1 - mm/vmstat.c | 8 +- 19 files changed, 319 insertions(+), 417 deletions(-) create mode 100644 include/linux/balloon.h delete mode 100644 include/linux/balloon_compaction.h rename mm/{balloon_compaction.c => balloon.c} (58%) base-commit: f8ed52ac0cfbddff992bb9600941bfe51e1e385a -- 2.52.0