Re: [PATCH v1 06/11] mm: support GUP-triggered unsharing via FAULT_FLAG_UNSHARE (!hugetlb)
From: Jason Gunthorpe <jgg@nvidia.com>
Date: 2021-12-21 23:59:24
Also in:
linux-kselftest, linux-mm, lkml
On Tue, Dec 21, 2021 at 06:40:30PM +0100, David Hildenbrand wrote:
What adds complexity to correctly maintain the "exclusive" state are at least: * KSM (might be harder, have to think about it)
I know little about it, but isn't KSM like fork where it is trying to WP pages with the intention of copying them? Shouldn't KSM completely reject WP'ing a page that is under any kind of writable GUP? Jason