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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> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <911f316b-87cf-45eb-8d9e-412473d7176a@amd.com> X-Rspamd-Queue-Id: 9A71DA0008 X-Stat-Signature: bp3mqhhcnj8jg8zd1r7xhr34a7w1ancr X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1770826020-708391 X-HE-Meta: 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 aEr924QN jE/9fJvWiDCmyC3KvOu2QsAro2RzSuocJyMWBh2ppqVSnA7GITQhsrD2wsUJ0H4mpPXVNU43+7tD72HbyCKoy1Au3VwuflKIr0k8ogTyX4gqCAUAXgIgpefH936K+znbyLBo5Fc+KPeYaj0/yslIr88D1Y9T2CJ2co3lPwPLJ5ypvOUn6csHr5/TAIqy7foTxZhwc1aRDhVPGhIHQxRXi2Z0LBVqc1cPoic0uubqNobi8vGpR+s7ApCiMpcUWROd0JDUpM2coBlhXxpCvImF8vOwENIqphWZoD5ZNsH9wkMayJLuuHxyRTpR3P1Vj5TZ2CLzxqyboVyTl9yGrY/idIeOgSnXsB/Ue7aNv4LOQKteTzut/pUEX/DXFKYP4Nk5M7pLI5W39885XuCPI9CUIqVn0yaqQJhsjOG+TH5WwojljhRM= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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