On 4/20/26 14:51, Michael S. Tsirkin wrote: > Add free_frozen_pages_hint(page, order, hints) to free a page > while marking it as pre-zeroed when PGHINT_ZEROED is set. > The PG_zeroed flag is set after __free_pages_prepare so it > survives on the free list. > > Add __folio_put_hint(), folio_put_hint(), and put_page_hint() > wrappers for the put_page path.
Can we defer that change? Putting a page with a hint, when there might still be other users of the page is a weird interface. In the long term, all balloon pages (PG_offline pages) will be frozen pages, and definitely not folios. Frozen pages don't have a refcount. It would then be sufficient to have the single owner of the page call something like free_frozen_zeroed_page(). Now, to convert balloon pages to be frozen requires some more work, primarily to balloon migration handling, unfortunately. I have it on my todo list, but it will take a while. -- Cheers, David
