From: Jason Gunthorpe <jgg@ziepe.ca>
To: Alice Ryhl <aliceryhl@google.com>
Cc: "David Hildenbrand (Arm)" <david@kernel.org>,
linux-kernel@vger.kernel.org,
"linux-mm @ kvack . org" <linux-mm@kvack.org>,
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Subject: Re: [PATCH v1 16/16] mm/memory: support VM_MIXEDMAP in zap_special_vma_range()
Date: Wed, 11 Mar 2026 09:04:18 -0300 [thread overview]
Message-ID: <20260311120418.GU1687929@ziepe.ca> (raw)
In-Reply-To: <abE4JYo223OxWCBQ@google.com>
On Wed, Mar 11, 2026 at 09:38:45AM +0000, Alice Ryhl wrote:
> It doesn't really make sense to have multiple binder VMAs. What happens
> with Rust Binder is that process A is receiving transactions and has the
> VMA mapped once.
IIRC the problem is the kernel doesn't guarentee singleton VMAs,
userspace can always clone them with fork or something. Did binder
solve this somehow?
Since you can't assume there is only one VMA the locking becomes a
mess to cover all the cases where userspace can trigger a VMA clone.
address space deals with this internally.
Thus, zap_special_vma_range() is extremely hard to use.
Jason
next prev parent reply other threads:[~2026-03-11 12:04 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-27 20:08 [PATCH v1 00/16] mm: cleanups around unmapping / zapping David Hildenbrand (Arm)
2026-02-27 20:08 ` [PATCH v1 01/16] mm/madvise: drop range checks in madvise_free_single_vma() David Hildenbrand (Arm)
2026-03-06 12:03 ` Lorenzo Stoakes (Oracle)
2026-02-27 20:08 ` [PATCH v1 02/16] mm/memory: remove "zap_details" parameter from zap_page_range_single() David Hildenbrand (Arm)
2026-02-28 12:38 ` Alice Ryhl
2026-03-02 8:18 ` David Hildenbrand (Arm)
2026-03-02 10:01 ` Alice Ryhl
2026-03-02 10:27 ` David Hildenbrand (Arm)
2026-03-02 10:33 ` Alice Ryhl
2026-03-02 15:01 ` David Hildenbrand (Arm)
2026-03-02 15:41 ` Alice Ryhl
2026-03-03 20:49 ` Miguel Ojeda
2026-03-04 8:47 ` David Hildenbrand (Arm)
2026-03-06 12:06 ` Lorenzo Stoakes (Oracle)
2026-03-09 16:44 ` Puranjay Mohan
2026-02-27 20:08 ` [PATCH v1 03/16] mm/memory: inline unmap_mapping_range_vma() into unmap_mapping_range_tree() David Hildenbrand (Arm)
2026-03-06 12:07 ` Lorenzo Stoakes (Oracle)
2026-02-27 20:08 ` [PATCH v1 04/16] mm/memory: simplify calculation in unmap_mapping_range_tree() David Hildenbrand (Arm)
2026-03-06 12:12 ` Lorenzo Stoakes (Oracle)
2026-03-11 8:09 ` David Hildenbrand (Arm)
2026-02-27 20:08 ` [PATCH v1 05/16] mm/oom_kill: use MMU_NOTIFY_CLEAR in __oom_reap_task_mm() David Hildenbrand (Arm)
2026-03-06 12:14 ` Lorenzo Stoakes (Oracle)
2026-02-27 20:08 ` [PATCH v1 06/16] mm/oom_kill: factor out zapping of VMA into zap_vma_for_reaping() David Hildenbrand (Arm)
2026-03-06 12:17 ` Lorenzo Stoakes (Oracle)
2026-02-27 20:08 ` [PATCH v1 07/16] mm/memory: rename unmap_single_vma() to __zap_vma_range() David Hildenbrand (Arm)
2026-03-06 12:17 ` Lorenzo Stoakes (Oracle)
2026-02-27 20:08 ` [PATCH v1 08/16] mm/memory: move adjusting of address range to unmap_vmas() David Hildenbrand (Arm)
2026-03-06 12:40 ` Lorenzo Stoakes (Oracle)
2026-02-27 20:08 ` [PATCH v1 09/16] mm/memory: convert details->even_cows into details->skip_cows David Hildenbrand (Arm)
2026-03-06 12:21 ` Lorenzo Stoakes (Oracle)
2026-03-11 8:28 ` David Hildenbrand (Arm)
2026-02-27 20:08 ` [PATCH v1 10/16] mm/memory: use __zap_vma_range() in zap_vma_for_reaping() David Hildenbrand (Arm)
2026-03-06 12:26 ` Lorenzo Stoakes (Oracle)
2026-03-11 8:18 ` David Hildenbrand (Arm)
2026-02-27 20:08 ` [PATCH v1 11/16] mm/memory: inline unmap_page_range() into __zap_vma_range() David Hildenbrand (Arm)
2026-03-06 12:29 ` Lorenzo Stoakes (Oracle)
2026-03-06 13:16 ` David Hildenbrand (Arm)
2026-03-09 13:46 ` Lorenzo Stoakes (Oracle)
2026-03-11 9:20 ` David Hildenbrand (Arm)
2026-02-27 20:08 ` [PATCH v1 12/16] mm: rename zap_vma_pages() to zap_vma() David Hildenbrand (Arm)
2026-03-06 12:30 ` Lorenzo Stoakes (Oracle)
2026-02-27 20:08 ` [PATCH v1 13/16] mm: rename zap_page_range_single_batched() to zap_vma_range_batched() David Hildenbrand (Arm)
2026-03-06 12:31 ` Lorenzo Stoakes (Oracle)
2026-02-27 20:08 ` [PATCH v1 14/16] mm: rename zap_page_range_single() to zap_vma_range() David Hildenbrand (Arm)
2026-02-28 12:44 ` Alice Ryhl
2026-03-02 8:22 ` David Hildenbrand (Arm)
2026-03-06 12:32 ` Lorenzo Stoakes (Oracle)
2026-03-09 16:46 ` Puranjay Mohan
2026-02-27 20:08 ` [PATCH v1 15/16] mm: rename zap_vma_ptes() to zap_special_vma_range() David Hildenbrand (Arm)
2026-03-04 15:26 ` Leon Romanovsky
2026-03-06 12:41 ` Lorenzo Stoakes (Oracle)
2026-03-11 8:20 ` David Hildenbrand (Arm)
2026-02-27 20:08 ` [PATCH v1 16/16] mm/memory: support VM_MIXEDMAP in zap_special_vma_range() David Hildenbrand (Arm)
2026-03-06 12:43 ` Lorenzo Stoakes (Oracle)
2026-03-09 14:29 ` Jason Gunthorpe
2026-03-11 9:15 ` David Hildenbrand (Arm)
2026-03-11 9:38 ` Alice Ryhl
2026-03-11 12:04 ` Jason Gunthorpe [this message]
2026-03-11 16:01 ` Alice Ryhl
2026-03-02 23:29 ` [PATCH v1 00/16] mm: cleanups around unmapping / zapping Andrew Morton
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