linux-kernel - Re: [PATCH v2 00/23] mm: balloon infrastructure cleanups

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Message-ID: <f0091aab-c90e-403c-9f91-f7d82b651985@kernel.org>
Date: Thu, 15 Jan 2026 12:26:34 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 linuxppc-dev@...ts.ozlabs.org,
 Broadcom internal kernel review list
 <bcm-kernel-feedback-list@...adcom.com>, linux-doc@...r.kernel.org,
 virtualization@...ts.linux.dev, Andrew Morton <akpm@...ux-foundation.org>,
 Oscar Salvador <osalvador@...e.de>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, Vlastimil Babka
 <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
 Suren Baghdasaryan <surenb@...gle.com>, Michal Hocko <mhocko@...e.com>,
 Jonathan Corbet <corbet@....net>, Madhavan Srinivasan <maddy@...ux.ibm.com>,
 Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin <npiggin@...il.com>,
 Christophe Leroy <christophe.leroy@...roup.eu>, Arnd Bergmann
 <arnd@...db.de>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Jerrin Shaji George <jerrin.shaji-george@...adcom.com>,
 Jason Wang <jasowang@...hat.com>, Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
 Eugenio Pérez <eperezma@...hat.com>, Zi Yan <ziy@...dia.com>
Subject: Re: [PATCH v2 00/23] mm: balloon infrastructure cleanups

On 1/15/26 10:32, Michael S. Tsirkin wrote:
> 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 <mst@...hat.com>

Thanks!

-- 
Cheers

David