From: Jason Gunthorpe <jgg@nvidia.com>
To: "Mika Penttilä" <mpenttil@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>,
linux-mm@kvack.org, dri-devel@lists.freedesktop.org,
intel-xe@lists.freedesktop.org, linux-kernel@vger.kernel.org,
David Hildenbrand <david@kernel.org>,
Leon Romanovsky <leonro@nvidia.com>,
Alistair Popple <apopple@nvidia.com>,
Balbir Singh <balbirs@nvidia.com>, Zi Yan <ziy@nvidia.com>,
Matthew Brost <matthew.brost@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Lorenzo Stoakes <ljs@kernel.org>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Vlastimil Babka <vbabka@suse.cz>, Mike Rapoport <rppt@kernel.org>,
Suren Baghdasaryan <surenb@google.com>,
Michal Hocko <mhocko@suse.com>
Subject: Re: [PATCH v15 00/11] migrate on fault for device pages
Date: Fri, 25 Sep 2026 09:47:37 -0300 [thread overview]
Message-ID: <20260925124737.GL9354@nvidia.com> (raw)
In-Reply-To: <65c5c412-56a7-46a9-b22b-22077a8e9727@redhat.com>
On Fri, Sep 25, 2026 at 01:23:52PM +0300, Mika Penttilä wrote:
>
> On 9/25/26 12:07, Christoph Hellwig wrote:
> > Who is going to use this? The series seems to lack an actual user for it.
>
> Two users:
>
> For one, existing migrate_vma_setup() callers, unchanged. The series
> reworks migrate_vma_setup() to collect via hmm_range_fault() internally
> (it sets HMM_PFN_REQ_MIGRATE and calls migrate_hmm_range_setup(),
> mm/migrate_device.c). So every in-tree migrate_vma consumer — nouveau,
> amdgpu/amdkfd, drm/xe via drm_pagemap, lib/test_hmm — runs on the new path.
So split the series so you don't add unused interfaces for now?
Jason
next prev parent reply other threads:[~2026-09-25 12:47 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-24 6:53 [PATCH v15 00/11] migrate on fault for device pages mpenttil
2026-09-24 6:53 ` [PATCH v15 01/11] mm/Kconfig: changes for " mpenttil
2026-09-24 7:11 ` sashiko-bot
2026-09-24 6:53 ` [PATCH v15 02/11] mm: add helper to convert HMM pfn to migrate pfn mpenttil
2026-09-24 6:53 ` [PATCH v15 03/11] mm/hmm: preparations for HMM to participate in migration mpenttil
2026-09-24 7:09 ` sashiko-bot
2026-09-24 6:53 ` [PATCH v15 04/11] mm/hmm: do the plumbing " mpenttil
2026-09-24 6:53 ` [PATCH v15 05/11] mm/hmm: migrate collection in HMM pagewalk - pte level mpenttil
2026-09-24 7:10 ` sashiko-bot
2026-09-24 6:53 ` [PATCH v15 06/11] mm/hmm: migrate collection in HMM pagewalk - pmd level mpenttil
2026-09-24 7:09 ` sashiko-bot
2026-09-24 6:53 ` [PATCH v15 07/11] mm/hmm: add lazy MMU mode support for migration in HMM pagewalk mpenttil
2026-09-24 6:53 ` [PATCH v15 08/11] mm/hmm: implement rollback for device page " mpenttil
2026-09-24 7:16 ` sashiko-bot
2026-09-24 6:53 ` [PATCH v15 09/11] mm: enable device page migration from " mpenttil
2026-09-24 6:53 ` [PATCH v15 10/11] lib/test_hmm: add a new testcase for the migrate on fault mpenttil
2026-09-24 7:27 ` sashiko-bot
2026-09-24 6:53 ` [PATCH v15 11/11] Documentation/mm/hmm: document migration through hmm_range_fault() mpenttil
2026-09-24 7:28 ` ✗ CI.checkpatch: warning for Migrate on fault for device pages (rev7) Patchwork
2026-09-24 7:30 ` ✓ CI.KUnit: success " Patchwork
2026-09-24 7:46 ` ✗ CI.checksparse: warning " Patchwork
2026-09-24 8:09 ` ✓ Xe.CI.BAT: success " Patchwork
2026-09-24 21:10 ` ✗ Xe.CI.FULL: failure " Patchwork
2026-09-25 9:07 ` [PATCH v15 00/11] migrate on fault for device pages Christoph Hellwig
2026-09-25 10:23 ` Mika Penttilä
2026-09-25 12:47 ` Jason Gunthorpe [this message]
2026-09-25 13:22 ` Mika Penttilä
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