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linux-cxl@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, damon@lists.linux.dev, kernel-team@meta.com, gregkh@linuxfoundation.org, rafael@kernel.org, dakr@kernel.org, dave@stgolabs.net, jonathan.cameron@huawei.com, dave.jiang@intel.com, alison.schofield@intel.com, vishal.l.verma@intel.com, ira.weiny@intel.com, dan.j.williams@intel.com, longman@redhat.com, akpm@linux-foundation.org, david@kernel.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, osalvador@suse.de, ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, ying.huang@linux.alibaba.com, apopple@nvidia.com, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, yury.norov@gmail.com, linux@rasmusvillemoes.dk, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, tj@kernel.org, hannes@cmpxchg.org, mkoutny@suse.com, jackmanb@google.com, 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RosKeo/9gpvmEdU3G8kaS36aWReLc+nd5wsRbpcZg9t2wusqdoLvis5mMxVtYal4SSe2Chmli8YvdVHRUIWDaY1Tvy3r70051M7Iyuq3Su1o+dvJVtTsOPSfVAOUEFqU2H4RvfGW1yAAbBjTELn34u8uRNIUbzqwKiuSQ9bdcBNrGuvNt1gzPZJoLpJgZKkmzjahbjPFi1yzi7XP9aCZDYAEF+xtGyiAjL4aODyfsdXgBlpXjCJjnjMuwTDI5ayVl2IhleqoQ2gv1VHPamgysQL88SO0XADcHX+HMQoxG3tqc/nDtg0MvV+nRg55uMAFVmm9wtaqfNirTTKCnF+gWTkCRpr5dtUM4wAdb94qdJHIlz9JBPXHuxfyC3CoNYFlR7AstzXuO1sLbwrQJxiWLQ9Ofw9nWl+cpySzqbslRu+4db+dG4adCA/i0UMB9u1RKXfK06GUeniMAMExcpu3EJb9EX0Po9NliLDvn Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed, Jun 10, 2026 at 06:41:57AM -0400, Gregory Price wrote: > On Wed, Jun 03, 2026 at 03:00:01PM +1000, Balbir Singh wrote: > > > > > > __GFP_THISNODE cannot be overloaded to do anything useful here. > > > > Let me clarify, I meant to say, let's use a nodemask for allocation > > and __GFP_THISNODE gets us to the node we desire, if that is the only > > node. My earlier comment might not have been clear. > > > > I've been tested an stripped back patch set where I drop all FALLBACK > entries for private nodes (including for itself) and only keep the > NOFALLBACK entry for private nodes. > > This effectively isolates the nodes for any allocation without > __GFP_THISNODE. > > This also precludes these nodes from ever using non-mbind mempolicies, > which I think is a completely reasonable compromise and something I was > already expecting we would do. > > Notably: slub.c injects __GFP_THISNODE internally on behalf of kmalloc, > which causes spillage into private nodes because slub allows private > nodes in its mask. I think this is fixable. > Agreed. > I have to inspect some other __GFP_THISNODE users (hugetlb, some arch > code, etc), but it seems like fully dropping the FALLBACK entries and > requiring __GFP_THISNODE might be sufficient. > > ~Gregory That's good progress, thanks for the update! Balbir