On 9/15/26 12:46, Kiryl Shutsemau wrote: > On Mon, Sep 14, 2026 at 05:07:37PM +0200, David Hildenbrand (Arm) wrote: >>> As I mentioned above, we drop the ptl after the freeze. And take it a >>> second time for the install. Allocation and the copy run in between with >>> no lock held -- on 64K the copy at PMD order is 512M of it, which is why >>> it cannot sit under either lock. >> >> Hold on, are freezing all folios to collapse? That cannot possibly work with >> COW-shared folios that are mapped into other address spaces. > > I break COW for worthy candidates in the faultin prepass before freeze, > alongside swapin. It simplifies the picture substantially. No rmap mess.
Hm, okay. So temporary memory allocations and page copying. -- Cheers, David
