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Thu, 26 Jun 2025 12:13:30 -0700 (PDT) Received: from gourry-fedora-PF4VCD3F ([2620:10d:c091:400::5:7aa]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-4a7fc13976bsm2792161cf.18.2025.06.26.12.13.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Jun 2025 12:13:29 -0700 (PDT) Date: Thu, 26 Jun 2025 14:13:27 -0500 From: Gregory Price To: Bijan Tabatabai Cc: SeongJae Park , damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, akpm@linux-foundation.org, david@redhat.com, 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, bijantabatab@micron.com, venkataravis@micron.com, emirakhur@micron.com, ajayjoshi@micron.com, vtavarespetr@micron.com Subject: Re: [RFC PATCH v2 0/2] mm/damon/paddr: Allow interleaving in migrate_{hot,cold} actions Message-ID: References: <20250620180458.5041-1-bijan311@gmail.com> <20250620202155.98021-1-sj@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Stat-Signature: hbis9q499eeg18tqtwn44xcua17cnq97 X-Rspamd-Queue-Id: C6241140002 X-Rspamd-Server: rspam08 X-HE-Tag: 1750965211-890446 X-HE-Meta: U2FsdGVkX19pqCN3qap0TY2J/EaBLHfozUrvji82qwnJyixyxwfRk8iz1rd0TO2NtSmcUwzWQMeagWReOfcZ4GsC903ZhLE6SWAndJjjgYwnjEX5VDiro11XMwCDlvjzt4nzD6KUXPy/WViT63/rmlfhdUnYZFn5bqeICqCB3hoOJRANV0L1dlHRzw9DzK7BsQBVawNKBo/Q7RUHEyjgqF3Qn1pSNnKYFQB+vMnX+5kKlReRSuNv/qVg8LYsffEHJenuNOZ2kHlzNJwULpgGpqa5saqnh9iybw+tD9lfQVEU1cn6fOmHtiBX0ZzebLB4R5CR8JQ1s1v9Te57gCOZmJuGqy2i1XfZWuzO19rrkEa2u5o8mwZZe7E9MtnCymiMgTWwo+/dBBrky5v+SDe1CDdAOqKD9IRCJaOr09hKNUUe+5CxCKGJilzY4vRoDlqGhhRjHb7udX6LHFmS+8d4sTL+xRWCpppCxHOG3/fjkdi+2ZCQrJGPJqG0nsN1YOl7gtcnYG4LfXF7x6utKwyGwGQddtdLSbYggyORVd3CmW600mnRb5He5AkXFrFUlHpvM/95WS7rWRWSjGHVhKkFcwB+hkA0L2w2t3xNhPHsXmtkC6jPbebTzw7kLMw6ILm3G/a003iJdMzyqK/nrGldnbfzPWMSLeO1X51ZGUkoFdOTI7fUbMinivyoy00pvgj6pnbxYbxhucyjY/o+M71WDCR+2xYfIYcx2l9OosDDbhOIAhbw6oG24MM1cwQFS7fK8RyV8yR+Zn4RKEPU9LfSIHmGBV7vziH84a0RC94qA/QtlZs8wjI7YY+AXuwSfGHXUkEdJYiwsK9mWy4HhmGpfSd3HVnMeaQmWBAAMuJTL66Sn+rhjSouEiT1Kgo/BbJT0dZ2gD4pKcPXt4ZUuZ/CkNArn5hRcTP1QkilzPgpmN6DD6N2h4J45Me0hGba9MI3j6RPt11ldPN84CFVBKZ VbEVh4z4 mFJ+gwFLyR5fxXGsVAB3dEzzlu1X4vPEFbLhn4IbL8kV3jimlR9E2eTK5gnz/5vgBzNwmiOP2mXazFpVSgLJPc6p/njI5LAexEZUzv7xAHYgLL+oXnYRU6NZBb+YvjxLZ5Z+yv/Lh1eJXaNFMf2uwqGckmSpxOPa5EK58drg8g0Wv+RdCehSQlZ/JDBx0MFS/C6/zt10GTnDiVl7l+ZVSKNbiuBgPBB1QxgxPrO9I5hRcd/a5Fd2itwMTAWwcptgalmfaGL5shA8OWb3Bh3nDgLKlrhJv0lycYEmwkrmh9yuBJqAD4IEsToz+dTXrMUWctR1tnweIMv2HPC48DyLZ/Z/GAjjopMC1Ij95FQa0bqJSSLBFeZkyqbA2PaE3iFcGZSqBSoelpr4yGn0dccpQyjy5ofCOy06FGPeno4XYH8eFw/kshQzOw3Wd6IX03KS1MFYYdXNgm/Q69gAxuN3nQy50cY0Anq9D7Vi58R8YJFX/adI= 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 Mon, Jun 23, 2025 at 06:21:20PM -0500, Bijan Tabatabai wrote: > I'm not convinced this is true. If you have a workload that can > saturate the local bandwidth but not the remote bandwidth, wouldn't > you want the interleave weights to be more biased towards local memory > than you would for a workload that can saturate both the local and > remote bandwidth? > That sounds like an argument for task/process/cgroup-local weights, as opposed to an argument to twiddle global weights. These things need not solve all problems for everyone. ~Gregory