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[173.79.60.52]) by smtp.gmail.com with ESMTPSA id af79cd13be357-930b545e47bsm957792285a.35.2026.07.20.12.35.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 20 Jul 2026 12:35:06 -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 11/36] mm/compaction: disallow compaction on private nodes Date: Mon, 20 Jul 2026 15:34:05 -0400 Message-ID: <20260720193431.3841992-12-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-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Skip compaction on private nodes. Compaction requires the ability to migrate pages, which is not yet supported on private nodes. Signed-off-by: Gregory Price --- mm/compaction.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/mm/compaction.c b/mm/compaction.c index 9f81055a358ed..8c1351cce7bcc 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -2462,6 +2462,9 @@ bool compaction_zonelist_suitable(struct alloc_context *ac, int order, !__cpuset_zone_allowed(zone, gfp_mask)) continue; + if (node_is_private(zone_to_nid(zone))) + continue; + /* * Do not consider all the reclaimable memory because we do not * want to trash just for a single high order allocation which @@ -2853,6 +2856,9 @@ enum compact_result try_to_compact_pages(gfp_t gfp_mask, unsigned int order, !__cpuset_zone_allowed(zone, gfp_mask)) continue; + if (node_is_private(zone_to_nid(zone))) + continue; + if (prio > MIN_COMPACT_PRIORITY && compaction_deferred(zone, order)) { rc = max_t(enum compact_result, COMPACT_DEFERRED, rc); @@ -2922,6 +2928,9 @@ static int compact_node(pg_data_t *pgdat, bool proactive) .proactive_compaction = proactive, }; + if (node_is_private(pgdat->node_id)) + return 0; + for (zoneid = 0; zoneid < MAX_NR_ZONES; zoneid++) { zone = &pgdat->node_zones[zoneid]; if (!populated_zone(zone)) @@ -3017,6 +3026,9 @@ static ssize_t compact_store(struct device *dev, { int nid = dev->id; + if (node_is_private(nid)) + return -EINVAL; + if (nid >= 0 && nid < nr_node_ids && node_online(nid)) { /* Flush pending updates to the LRU lists */ lru_add_drain_all(); -- 2.53.0-Meta