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[173.79.60.52]) by smtp.gmail.com with ESMTPSA id af79cd13be357-930b545e47bsm957792285a.35.2026.07.20.12.34.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Jul 2026 12:34:59 -0700 (PDT) From: Gregory Price To: linux-mm@kvack.org Cc: Zhigang.Luo@amd.com, arun.george@samsung.com, balbirs@nvidia.com, brendan.jackman@linux.dev, yuzenghui@huawei.com, apopple@nvidia.com, alucerop@amd.com, matthew.brost@intel.com, akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org, liam@infradead.org, vbabka@kernel.org, rppt@kernel.org, surenb@google.com, mhocko@suse.com, corbet@lwn.net, skhan@linuxfoundation.org, gregkh@linuxfoundation.org, rafael@kernel.org, dakr@kernel.org, djbw@kernel.org, vishal.l.verma@intel.com, dave.jiang@intel.com, alison.schofield@intel.com, osandov@osandov.com, jannh@google.com, pfalcato@suse.de, jackmanb@google.com, hannes@cmpxchg.org, ziy@nvidia.com, pbonzini@redhat.com, osalvador@suse.de, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, gourry@gourry.net, ying.huang@linux.alibaba.com, kasong@tencent.com, qi.zheng@linux.dev, shakeel.butt@linux.dev, baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, yury.norov@gmail.com, linux@rasmusvillemoes.dk, longman@redhat.com, ridong.chen@linux.dev, tj@kernel.org, mkoutny@suse.com, sj@kernel.org, jgg@ziepe.ca, jhubbard@nvidia.com, peterx@redhat.com, baolin.wang@linux.alibaba.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, lance.yang@linux.dev, usama.arif@linux.dev, xu.xin16@zte.com.cn, chengming.zhou@linux.dev, roman.gushchin@linux.dev, muchun.song@linux.dev, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, driver-core@lists.linux.dev, nvdimm@lists.linux.dev, linux-cxl@vger.kernel.org, linux-debuggers@vger.kernel.org, linux-fsdevel@vger.kernel.org, kvm@vger.kernel.org, cgroups@vger.kernel.org, damon@lists.linux.dev, linux-kselftest@vger.kernel.org, kernel-team@meta.com Subject: [PATCH v5 08/36] mm/mempolicy: skip private node folios when queueing for migration Date: Mon, 20 Jul 2026 15:34:02 -0400 Message-ID: <20260720193431.3841992-9-gourry@gourry.net> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260720193431.3841992-1-gourry@gourry.net> References: <20260720193431.3841992-1-gourry@gourry.net> Precedence: bulk X-Mailing-List: linux-debuggers@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Private nodes are already kept out of policy nodemasks (only N_MEMORY nodes are allowed), but an mbind(MPOL_MF_MOVE) walk can still encounter a private-node folio in the range. Skip such folios so mempolicy-driven migration never moves private-node memory. We already do this for ZONE_DEVICE folios - use the same filter points for ZONE_DEVICE (with an additional point for large pages). Signed-off-by: Gregory Price --- mm/mempolicy.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 5720f7f54d942..8e8763f6e5f5b 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -111,6 +111,7 @@ #include #include #include +#include #include #include @@ -668,6 +669,8 @@ static void queue_folios_pmd(pmd_t *pmd, struct mm_walk *walk) } if (!queue_folio_required(folio, qp)) return; + if (folio_is_private_node(folio)) + return; if (!(qp->flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) || !vma_migratable(walk->vma) || !migrate_folio_add(folio, qp->pagelist, qp->flags)) @@ -722,7 +725,7 @@ static int queue_folios_pte_range(pmd_t *pmd, unsigned long addr, continue; } folio = vm_normal_folio(vma, addr, ptent); - if (!folio || folio_is_zone_device(folio)) + if (!folio || folio_is_private_managed(folio)) continue; if (folio_test_large(folio) && max_nr != 1) nr = folio_pte_batch(folio, pte, ptent, max_nr); @@ -797,6 +800,8 @@ static int queue_folios_hugetlb(pte_t *pte, unsigned long hmask, folio = pfn_folio(pte_pfn(ptep)); if (!queue_folio_required(folio, qp)) goto unlock; + if (folio_is_private_node(folio)) + goto unlock; if (!(flags & (MPOL_MF_MOVE | MPOL_MF_MOVE_ALL)) || !vma_migratable(walk->vma)) { qp->nr_failed++; -- 2.53.0-Meta