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b=WK2w6zkg+hyM6I0VJmSXyURzLnFtpc8fa4kp/+6F9Gi5LZf4krxwBHJnM417Z1HwV 9umdTxCwTRdKgS9Ti0iL57DO/fztm1+KxMc+o7XdMEC5t2Ww6ErmYWZz1I4mUPgsXF 91o+JFyKX1LUceV66zsy+c/FSECXK4H/1woHnRs7IzggpjLwAhXxLSOyVMjFHrAyUI eNSuVol+evLXtWKdS6hblQPBl4JNN3FCSD+f8pW3rOrvzqkpsgR4IJH4vUjmZl5/Ax kygbhDx1GVkFlLh6P9toqqVBHyQ0oHKjQD8aCWbCgT5lUbtdlLZ68D+Tj2rlfdMusy W+rTYYsTPrm+Q== From: SeongJae Park To: Ravi Jonnalagadda Cc: SeongJae Park , damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, akpm@linux-foundation.org, corbet@lwn.net, bijan311@gmail.com, ajayjoshi@micron.com, honggyu.kim@sk.com, yunjeong.mun@sk.com Subject: Re: [RFC PATCH 5/5] mm/damon/paddr: add time budget to migration page walk Date: Sun, 17 May 2026 16:43:24 -0700 Message-ID: <20260517234326.89365-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260516210357.2247-6-ravis.opensrc@gmail.com> References: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: BC74C120002 X-Rspam-User: X-Stat-Signature: tst1yyydod7da7net61id1f5fpo99nm5 X-HE-Tag: 1779061415-564571 X-HE-Meta: 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 5Djp0m1l 6SRTbNSPkOTdWtgX0Cn10ZS4qB40LEBDuNtlehpJCOpXoqLQh2pxN8gSX34C4TxW93O4zZ9kc9VOKofvlRWorBg3HoOjiU9j5qiTrJcaPVcghW9pEga9CGbUV4OEwVy69+0RgURuzFZu64N4qhJGIoq5m7uysaokcOmoj0XWQ0LUACBTJKV0TbcdaeqkwT8+IzsmggD8ZtxkFivqN9O9bkEMOZhwN5BQ7b9Ursg/ZQDew5XJYG45CNW7TfcZqzFQQHYeJRM56GMTOAVAI3ioqPcoxUA1+85g4oX6/94HI3sOypi/tzYqJDq47/+41n2EuhcoKWhg2v/XzDN1YrFTETDlE/zdgQk7GY3Hu55SSu5LEu78= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Sat, 16 May 2026 14:03:57 -0700 Ravi Jonnalagadda wrote: > On populated physical address ranges the pageblock skip optimization > alone is insufficient — most pageblocks contain at least one allocated > page, so the walk still iterates millions of PFNs. So my questions to the fourth patch of this series are also applied here, especially about the assumption of systems having most memory free. I will hold digging deep here until the high level discussion is completed. Thanks, SJ [...]