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[173.79.60.52]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-52db613ca70sm37684191cf.13.2026.08.18.05.51.47 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Aug 2026 05:51:48 -0700 (PDT) Date: Tue, 18 Aug 2026 08:51:46 -0400 From: Gregory Price To: Balbir Singh Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, ziy@nvidia.com, baolin.wang@linux.alibaba.com, liam@infradead.org, nico.pache@linux.dev, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, usama.arif@linux.dev, vbabka@kernel.org, jannh@google.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, ying.huang@linux.alibaba.com, apopple@nvidia.com, stable@vger.kernel.org Subject: Re: [PATCH v2 3/3] mm/mempolicy: skip zone device folios when queueing folios Message-ID: References: <20260817220810.1175596-1-gourry@gourry.net> <20260817220810.1175596-4-gourry@gourry.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Aug 18, 2026 at 09:34:49AM +1000, Balbir Singh wrote: > On Mon, Aug 17, 2026 at 06:08:10PM -0400, Gregory Price wrote: > > > > diff --git a/mm/mempolicy.c b/mm/mempolicy.c > > index 3498a5651d50f..3418b5664dcf8 100644 > > --- a/mm/mempolicy.c > > +++ b/mm/mempolicy.c > > @@ -662,6 +662,8 @@ static void queue_folios_pmd(pmd_t *pmd, struct mm_walk *walk) > > return; > > } > > folio = pmd_folio(pmdval); > > + if (folio_is_zone_device(folio)) > > + return; > > if (is_huge_zero_folio(folio)) { > > walk->action = ACTION_CONTINUE; > > return; > > -- > > 2.53.0-Meta > > > > > A similar patch was sent out earlier, but that was only for zone device > private THP, we don't support migration of device coherent THP today (we > should add support). The patch itself makes sense > Yeah IIRC that was Usama's and I got confused thinking this had already been resolved - but i realized this still affects device coherent. ty! ~Gregory