On 8/7/26 23:52, Ackerley Tng via B4 Relay wrote: > From: Ackerley Tng <[email protected]> > > A guest_memfd folio is safe for conversion if guest_memfd holds the last > references on it. Any other references on the folio may indicate another > user, and guest_memfd cannot convert it to private if there may be an > existing host user. > > A folio will have extra refcounts if it is present in a per-CPU lru_add > fbatch. guest_memfd does not actually participate in LRU, but > freshly-allocated folios are still added to the lru_add fbatch for batch > LRU statistics processing.
As discussed, what would happen if we mlocked gmem folios? In that case, they could also have been added to the mlock cache (which we treat like an LRU cache). But that's just a comment regarding the text here. [...] -- Cheers, David
