[PATCH v1 04/23] mm/balloon_compaction: centralize basic page migration handling

[David Hildenbrand]

On 21.10.25 22:50, Michael S. Tsirkin wrote:
> On Tue, Oct 21, 2025 at 02:59:09PM +0200, David Hildenbrand 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 mach the other
> 
> match

Thanks!

-- 
Cheers

David / dhildenb