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[173.79.60.52]) by smtp.gmail.com with ESMTPSA id af79cd13be357-939e7f184f5sm163816985a.15.2026.09.10.22.38.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Sep 2026 22:38:12 -0700 (PDT) Date: Fri, 11 Sep 2026 01:38:10 -0400 From: Gregory Price To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.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, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, kprateek.nayak@amd.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, nico.pache@linux.dev, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev, usama.arif@linux.dev, kas@kernel.org, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, ying.huang@linux.alibaba.com, apopple@nvidia.com, jannh@google.com, pfalcato@suse.de, osalvador@suse.de, hannes@cmpxchg.org, raghavendra.kt@amd.com Subject: Re: [PATCH v2 0/4] sched/numa: stop VMA scan filters from gating promotion Message-ID: References: <20260911001826.2109390-1-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: <20260911001826.2109390-1-gourry@gourry.net> On Thu, Sep 10, 2026 at 08:18:22PM -0400, Gregory Price wrote: > NUMA balancing uses hinting faults for both task placement and memory-tier > promotion. Several filters designed to avoid unproductive socket-placement > faults can also prevent promotion. > sashiko notes - remaining notes appear to be false positives. patch 2: "... bounce horizontally between slow tiers" <- nonsense patch 3 and 4: it's existing code extracted into a helper, using the same checks we're already using. If we want it updated, that can come in a separate patch. note: this work has some backport conflicts, but tiered numa balancing has effectively been broken multiple times since 2022 and 2023 due to these filtering mechanisms. ~Gregory