linux-kernel - Re: [PATCH v2 04/23] mm/balloon_compaction: centralize basic page migration handling

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Message-ID: <7cbea892-0ccd-4132-af55-d72abd704d6c@kernel.org>
Date: Mon, 19 Jan 2026 23:25:10 +0100
From: "David Hildenbrand (Red Hat)" <david@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: 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>,
 "Michael S. Tsirkin" <mst@...hat.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 04/23] mm/balloon_compaction: centralize basic page
 migration handling

On 1/19/26 23:22, David Hildenbrand (Red Hat) wrote:
> On 1/15/26 10:19, David Hildenbrand (Red Hat) wrote:
>> Let's update the balloon page references, the balloon page list, the
>> BALLOON_MIGRATE counter and the isolated-pages counter in
>> balloon_page_migrate(), after letting the balloon->migratepage()
>> callback deal with the actual inflation+deflation.
>>
>> Note that we now perform the balloon list modifications outside of any
>> implementation-specific locks: which is fine, there is nothing special
>> about these page actions that the lock would be protecting.
>>
>> The old page is already no longer in the list (isolated) and the new page
>> is not yet in the list.
>>
>> Let's use -ENOENT to communicate the special "inflation of new page
>> failed after already deflating the old page" to balloon_page_migrate() so
>> it can handle it accordingly.
>>
>> While at it, rename balloon->b_dev_info to make it match the other
>> functions. Also, drop the comment above balloon_page_migrate(), which
>> seems unnecessary.
>>
>> Signed-off-by: David Hildenbrand (Red Hat) <david@...nel.org>
>> ---
> 
> Andrew, the following on top:

Ah no, I'll rather resend the whole thing, as it creates some conflicts 
in the other patches.

-- 
Cheers

David