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b=aVc4MG4Dva/7uUdv7P6Vmf6wzdlSlfuXAbF4fbudSUCX3FEFTo9ZNmkBszcBrVfvZ nYPHezZfzC8HIe/otV7XQJAUBzF/e1BNchD0BQcshcX6AGa/bsczfKAY4UJdITERjr EwX2OkHqeqSTZb5qdoj/QucWjUMFlqhSwGvxvyoIaI2hjLLjklQV8kn8f5nBpV2fND /oAYc+i4wxe0GGNqdlzpOMUQwcL1UdAIMKnamlokX4H4PC2NIZsk790eo0KitwNDDc a4dHGQbp6bBkFqxS/4nw2kk1aqKnUefPwy01r1ov7z1gNi98ZJ5aP4slrcfsX2qdS4 7360ak0cNNaUA== From: SeongJae Park To: Usama Arif Cc: SeongJae Park , akpm@linux-foundation.org, damon@lists.linux.dev, linux-mm@kvack.org Subject: Re: [v1 1/2] mm/damon: have damon_get_folio return folio even for tail pages Date: Thu, 16 Jan 2025 10:49:32 -0800 Message-Id: <20250116184932.23409-1-sj@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250116144436.3947318-1-usamaarif642@gmail.com> References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 1361518000C X-Stat-Signature: i8ocexgrpep386a4nxqcb3isg4cycuyp X-Rspamd-Server: rspam08 X-Rspam-User: X-HE-Tag: 1737053376-826525 X-HE-Meta: U2FsdGVkX19/uGz/xa3XTeJloOa7PB8N9pZMWdcEAxIhRZlu8WDbtsAM6lKV6sCTz7jbl6vAWsixkgPoUhi3IzC5c9urNgQcmOpscRTnrmFo+eZ7cYXweAoy0V6XNGWrXJrmgwoQsD6Gu0Tgkk8zo50phsTDIYW4h7ZokRj5F3/BJ3yp3ShEwiLZUYjNI37yuGrdbIHD2If1ah2dKuy0QstHBk7Dwez/CiIYMq7bjo+aX+VueCjGdaMj4B+NRKLgBxdbk83or9MU5gR3NO3uxayQ5R4umxcEleT7iulrt9XMepb3CQI1t0EsIELzQZ7U7TinRPx9mWhUV7hidJuhP7fp6Mtfw+dxX+8UCE8QrgnoyEzSz0y382xYbsuwf6yI8W08viZGdTBfnXKG8BDANnh2Xr48+2MqNW5EXVydM/P7npXNjTEi8anRhbi9Ci69liAD7IAWH+OdwoKCPqP7+fyBrsI2UzNf0znE41YC48F8CuWPCSeqxAETz2rX0i6q7K01e2styZF7AlsRc86vuq4Bby5jGd4na00+EOMpCU85NAOXz0aQD43X69Bb/beDDP+yHbENuNGcC+0tkSkLITnIvVRzvWrRtX9gulsk2rMdSD80QG2zFLfmYJou2j9VNekrCDbhA/0x13fxhiMQfUBPNKBx/ohp+Yfa8axydcf0E/NwZRXMDaCPGZ0reT+WSgXby9INB5w+1/5Kl+qF8qB5hnWRoaOq9ii8JjGpADqrc2zcKowDMAuYHosauQ5ScjQ6lcOBz90+NlFzNqJZJVww0PgnfdaTGUFT1jnU8II8q7oMVMIt2Ej/P5ukNsI4eTeiGnMBTam7UjU1rXLcgf83/ePqT03Edv1uDM44BbdMFN1RZhchf1cSh4Oe2EhPaNARb7sqbAnDkK2kVfL2MHS3kVS23S5RBL5un7ZgZiHuFmtmmff2k8uX20a8298cdBBFpi3rq8zPMhjj0ep ZSERYiZ3 8y7M2r+am56+C7vvWaMrKzh5EDKu+BrkZb3thtdBJ9FbbIMN7i2zc7mvL29BTnKW5Fp6Q8gt3nd872lUKmJbN2mE1qUYk1J/V/rJ7e9vveX9asQRYwiuuuftvC9tyymiuQfQjqTaBfz1OnxQrJkQXaKH5yOf6andQtmjb2u504sPi7sNu2iMR5gtCHW/BWK15fEQTb01wxz2tWRWDtQiB1ylBaJ9BXvUUHJBEZoPb4FuSeRN13v5/H1HxrHqtvB7DBjfs98BJZBNDKl+h6GzCnBgS8VZuLVDhytYv+oFGjGlu9ZMEfDdr1HDDx4rriashulFI X-Bogosity: Ham, tests=bogofilter, spamicity=0.000169, 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 Thu, 16 Jan 2025 14:44:35 +0000 Usama Arif wrote: > This effectively adds support for large folios in damon for paddr, > as damon_pa_mkold/young won't get a null folio from this function > and won't ignore it, hence access will be checked and reported. > This also means that larger folios will be considered for > different DAMOS actions like pageout, prioritization and migration. > As these DAMOS actions will consider larger folios, iterate through > the region at folio_size and not PAGE_SIZE intervals. > This should not have an affect on vaddr, as damon_young_pmd_entry > considers pmd entries. This patch will improve both accuracy of monitoring results and efficiency of DAMOS for paddr use cases on THP-enabled systems. Thank you Usama! > > Signed-off-by: Usama Arif Reviewed-by: SeongJae Park Thanks, SJ [...]