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 izB/kzHW 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Jan 09, 2026 at 12:28:22PM -0500, Zi Yan wrote: > On 9 Jan 2026, at 6:09, Mika Penttilä wrote: > > > Hi, > > > > On 1/9/26 10:54, Francois Dugast wrote: > > > >> From: Matthew Brost > >> > >> Split device-private and coherent folios into individual pages before > >> freeing so that any order folio can be formed upon the next use of the > >> pages. > >> > >> Cc: Balbir Singh > >> Cc: Alistair Popple > >> Cc: Zi Yan > >> Cc: David Hildenbrand > >> Cc: Oscar Salvador > >> Cc: Andrew Morton > >> Cc: linux-mm@kvack.org > >> Cc: linux-cxl@vger.kernel.org > >> Cc: linux-kernel@vger.kernel.org > >> Signed-off-by: Matthew Brost > >> Signed-off-by: Francois Dugast > >> --- > >> mm/memremap.c | 2 ++ > >> 1 file changed, 2 insertions(+) > >> > >> diff --git a/mm/memremap.c b/mm/memremap.c > >> index 63c6ab4fdf08..7289cdd6862f 100644 > >> --- a/mm/memremap.c > >> +++ b/mm/memremap.c > >> @@ -453,6 +453,8 @@ void free_zone_device_folio(struct folio *folio) > >> case MEMORY_DEVICE_COHERENT: > >> if (WARN_ON_ONCE(!pgmap->ops || !pgmap->ops->folio_free)) > >> break; > >> + > >> + folio_split_unref(folio); > >> pgmap->ops->folio_free(folio); > >> percpu_ref_put_many(&folio->pgmap->ref, nr); > >> break; > > > > This breaks folio_free implementations like nouveau_dmem_folio_free > > which checks the folio order and act upon that. > > Maybe add an order parameter to folio_free or let the driver handle the split? 'let the driver handle the split?' - I had consisder this as an option. > > Passing an order parameter might be better to avoid exposing core MM internals > by asking drivers to undo compound pages. > It looks like Nouveau tracks free folios and free pages—something Xe’s device memory allocator (DRM Buddy) cannot do. I guess this answers my earlier question of how Nouveau avoids hitting the same bug as Xe / GPU SVM with respect to reusing folios. It appears Nouveau prefers not to split the folio, so I’m leaning toward moving this call into the driver’s folio_free function. Matt > Best Regards, > Yan, Zi