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b=sdFUGL+bB3yHHLYGp3uRMfz4GT7WL9dcbyIhwyKGHGPChZv0av4AfVdCHTTG37oz8 XAs9Rv3JJJF840+0yCqH9Xp/Nba+Dsr2ATMSpCX0WCAuXg2Z15JdA8HT947N0vmijk 7k7dDib1TEcpcKgoKLUsCPWVpjjZZmXNXBIxAMphwen+pH5L6C2ctaCXYO3S42v+DT mDNYxbRUorkKD5mja4kEqAlEfnKgYcr6i+ds6O4ythHzcoPegrAlt9fOeyb1RkuZQW 8thUrMqc1oiypWWYtoZhDLeol0M+Q5QBL2mN1HCpHbTcwEnSnwnIquTTrmCUcSPJse bRawS+CdFqTyA== From: SeongJae Park To: SeongJae Park Cc: linux-mm@kvack.org, Asier Gutierrez , damon@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [LSF/MM/BPF TOPIC] Data Access-aware Transparent Hugepages Date: Tue, 10 Feb 2026 20:45:33 -0800 Message-ID: <20260211044533.69515-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260211022845.68865-1-sj@kernel.org> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: CAF7710000F X-Stat-Signature: jesm8e9qrzprbwypc73rfkospwmsb5qm X-Rspam-User: X-HE-Tag: 1770785142-458820 X-HE-Meta: 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 NmyxWDP8 /bMHwyfBivgG+Yd5VpuKK+tVmK/sHCIUoUu6BhP010j2CUV7WrIEFvt996IPLxcals9sZmjeGpjs0qTJRo35EHIi5L7uiAcnPHcqPwTwMx3PQQjlqEbCCe0ie45x8qI/hNRL6NPlQS/OnjzDXHrcDDRblkWc43Y9LWlzTOhwD1tMMqGIFcDgkawBprRP/quNY7vvtNjGdYX5iGbgkaaF+zBuiaa77id0HvzKlruCk4re8beu5ZjpNtKWWM+wBP/+iiisZx23bjY4OHTk2XDlSA3fjk87UlOnJN79YXVQdWDqDIsBadTJ/87jBOwJlGmkmeeqjp/ESh2AUk6CkyNMJ33lVMSkVmEI4YMN4 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: Forgot Cc-ing damon@ and linux-kernel@. Adding those. Sorry for noise. On Tue, 10 Feb 2026 18:28:55 SeongJae Park wrote: > Hello, > > > Transparent Huge Pages (THP) could be more efficient if those are used only for > frequently accessed data. DAMON is one of the ways for fidning such hot data, > and hence there were interests in utilizing DAMON for access-aware THP. A > simple experiment leveraging MADV_[NO]HUGEPAGE based on DAMON-identifed hot and > cold memory regions was conducted as a proof of the concept. The experiment > demonstrated [1] an 80% reduction in memory overhead while retaining 46% of THP > performance gains. > > Multiple discussions for further developing production level access-aware THP > solutions have followed. Most of the discussions were made in private, though > Asier recently proposed yet another approach [2] on the mailing list. As a > result, we collected interesting challenges and ideas for the production level > data access-aware THP. Some of the ideas are not yet public, could be > controversial, and missing important things that more eyeballs can find. I > want to discuss those in LSF/MM/BPF to get more ideas and make high level > community alignments for next steps. > > [1] https://assets.amazon.science/b7/2b/ce53222247739b174f2b54498d1a/daos-data-access-aware-operating-system.pdf > [2] https://lore.kernel.org/20260202145650.1795854-1-gutierrez.asier@huawei-partners.com > > > Thanks, > SJ > Sent using hkml (https://github.com/sjp38/hackermail)