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[96.255.20.138]) by smtp.gmail.com with ESMTPSA id 6a1803df08f44-8971cda750dsm19906386d6.35.2026.02.11.08.06.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 Feb 2026 08:06:59 -0800 (PST) Date: Wed, 11 Feb 2026 11:06:57 -0500 From: Gregory Price To: Bharata B Rao Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Jonathan.Cameron@huawei.com, dave.hansen@intel.com, mgorman@techsingularity.net, mingo@redhat.com, peterz@infradead.org, raghavendra.kt@amd.com, riel@surriel.com, rientjes@google.com, sj@kernel.org, weixugc@google.com, willy@infradead.org, ying.huang@linux.alibaba.com, ziy@nvidia.com, dave@stgolabs.net, nifan.cxl@gmail.com, xuezhengchu@huawei.com, yiannis@zptcorp.com, akpm@linux-foundation.org, david@redhat.com, byungchul@sk.com, kinseyho@google.com, joshua.hahnjy@gmail.com, yuanchu@google.com, balbirs@nvidia.com, alok.rathore@samsung.com, shivankg@amd.com Subject: Re: [RFC PATCH v5 00/10] mm: Hot page tracking and promotion infrastructure Message-ID: References: <20260129144043.231636-1-bharata@amd.com> <911f316b-87cf-45eb-8d9e-412473d7176a@amd.com> 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: <911f316b-87cf-45eb-8d9e-412473d7176a@amd.com> On Wed, Feb 11, 2026 at 09:00:26PM +0530, Bharata B Rao wrote: > - pghot-default mode doesn't show benefit even when achieving similar page promotion > numbers. This mode doesn't track accessing NID and by default promotes to NID=0 > which probably isn't all that beneficial as processes are running on both Node 0 > and Node 1. > Lacking access-nid data, maybe it's better to select a random (or round-robin) node in the upper tier? That would at least approach 1/N accuracy in promotion for most access patterns. ~Gregory