Re: [LSF/MM/BPF TOPIC][RFC PATCH v4 00/27] Private Memory Nodes (w/ Compressed RAM)
From: Gregory Price <gourry@gourry.net>
Date: 2026-02-23 16:08:42
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On Mon, Feb 23, 2026 at 09:54:55AM -0500, Gregory Price wrote:
On Mon, Feb 23, 2026 at 02:07:15PM +0100, David Hildenbrand (Arm) wrote:quoted
I'm concerned about adding more special-casing (similar to what we already added for ZONE_DEVICE) all over the place. Like the whole folio_managed_() stuff in mprotect.c Having that said, sounds like a reasonable topic to discuss.Another option would be to add the hook to vma_wants_writenotify() instead of the page table code - and mask MM_CP_TRY_CHANGE_WRITABLE.
scratch all this - existing hooks exist for exactly this purpose: can_change_[pte|pmd]_writable() Surprised I missed this. I can clean this up to remove it from the page table walks. Still valid to question whether we want this, but at least the hook lives with other write-protect hooks now. ~Gregory