From: Gregory Price <gourry@gourry.net>
To: "David Hildenbrand (Arm)" <david@kernel.org>
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Subject: Re: [LSF/MM/BPF TOPIC][RFC PATCH v4 00/27] Private Memory Nodes (w/ Compressed RAM)
Date: Mon, 23 Feb 2026 11:08:38 -0500 [thread overview]
Message-ID: <aZx7hsVNU0XOCCiG@gourry-fedora-PF4VCD3F> (raw)
In-Reply-To: <aZxqP7J1kOClQUPQ@gourry-fedora-PF4VCD3F>
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:
> >
> > 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
prev parent reply other threads:[~2026-02-23 16:08 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-22 8:48 Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 01/27] numa: introduce N_MEMORY_PRIVATE node state Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 02/27] mm,cpuset: gate allocations from N_MEMORY_PRIVATE behind __GFP_PRIVATE Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 03/27] mm/page_alloc: add numa_zone_allowed() and wire it up Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 04/27] mm/page_alloc: Add private node handling to build_zonelists Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 05/27] mm: introduce folio_is_private_managed() unified predicate Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 06/27] mm/mlock: skip mlock for managed-memory folios Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 07/27] mm/madvise: skip madvise " Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 08/27] mm/ksm: skip KSM " Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 09/27] mm/khugepaged: skip private node folios when trying to collapse Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 10/27] mm/swap: add free_folio callback for folio release cleanup Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 11/27] mm/huge_memory.c: add private node folio split notification callback Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 12/27] mm/migrate: NP_OPS_MIGRATION - support private node user migration Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 13/27] mm/mempolicy: NP_OPS_MEMPOLICY - support private node mempolicy Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 14/27] mm/memory-tiers: NP_OPS_DEMOTION - support private node demotion Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 15/27] mm/mprotect: NP_OPS_PROTECT_WRITE - gate PTE/PMD write-upgrades Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 16/27] mm: NP_OPS_RECLAIM - private node reclaim participation Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 17/27] mm/oom: NP_OPS_OOM_ELIGIBLE - private node OOM participation Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 18/27] mm/memory: NP_OPS_NUMA_BALANCING - private node NUMA balancing Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 19/27] mm/compaction: NP_OPS_COMPACTION - private node compaction support Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 20/27] mm/gup: NP_OPS_LONGTERM_PIN - private node longterm pin support Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 21/27] mm/memory-failure: add memory_failure callback to node_private_ops Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 22/27] mm/memory_hotplug: add add_private_memory_driver_managed() Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 23/27] mm/cram: add compressed ram memory management subsystem Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 24/27] cxl/core: Add cxl_sysram region type Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 25/27] cxl/core: Add private node support to cxl_sysram Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 26/27] cxl: add cxl_mempolicy sample PCI driver Gregory Price
2026-02-22 8:48 ` [RFC PATCH v4 27/27] cxl: add cxl_compression " Gregory Price
2026-02-23 13:07 ` [LSF/MM/BPF TOPIC][RFC PATCH v4 00/27] Private Memory Nodes (w/ Compressed RAM) David Hildenbrand (Arm)
2026-02-23 14:54 ` Gregory Price
2026-02-23 16:08 ` Gregory Price [this message]
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