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[192.26.29.9]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-af91a0753f9sm425028166b.20.2025.08.02.04.52.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 02 Aug 2025 04:52:58 -0700 (PDT) From: Yueyang Pan To: SeongJae Park , Andrew Morton , Usama Arif Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@meta.com, Yueyang Pan Subject: [PATCH v4 0/2] mm/damon/vaddr: support stat-purpose DAMOS filters Date: Sat, 2 Aug 2025 11:52:44 +0000 Message-ID: X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Extend DAMOS_STAT handling of the DAMON operations sets for virtual address spaces for ops-level DAMOS filters. Functionality Test ================== I wrote a small test program which allocates 10GB of DRAM, use madvise(MADV_HUGEPAGE) to convert the base pages to 2MB huge pages Then my program does the following things in order: 1. Write sequentially to the whole 10GB region 2. Read the first 5GB region sequentially for 10 times 3. Sleep 5s 4. Read the second 5GB region sequentially for 10 times With a proper damon setting, we are expected to see df-passed to be 10GB and hot region move around with the read $ # Start DAMON $ sudo ./damo/damo start "./my_test/test" --monitoring_intervals 100ms\ 1s 2s $ # Show DAMON-generated access pattern snapshot $ sudo ./damo/damo report access --snapshot_damos_filter allow \ hugepage_size 2MiB 2MiB heatmap: # min/max temperatures: -600,000,000, 100,001,000, column size: 137.352 MiB intervals: sample 100 ms aggr 1 s (max access hz 10) # damos filters (df): reject none hugepage_size [2.000 MiB, 2.000 MiB] df-pass: # min/max temperatures: -400,000,000, 100,001,000, column size: 128.031 MiB 0 addr 85.373 TiB size 745.555 MiB access 0 hz age 6 s df-passed 0 B 1 addr 127.608 TiB size 877.664 MiB access 3.000 hz age 0 ns df-passed 878.000 MiB 2 addr 127.609 TiB size 219.418 MiB access 2.000 hz age 0 ns df-passed 220.000 MiB 3 addr 127.609 TiB size 316.613 MiB access 1.000 hz age 1 s df-passed 316.000 MiB 4 addr 127.609 TiB size 474.922 MiB access 1.000 hz age 1 s df-passed 476.000 MiB 5 addr 127.610 TiB size 407.188 MiB access 1.000 hz age 0 ns df-passed 406.000 MiB 6 addr 127.610 TiB size 610.781 MiB access 1.000 hz age 0 ns df-passed 612.000 MiB 7 addr 127.611 TiB size 697.309 MiB access 0 hz age 0 ns df-passed 696.000 MiB 8 addr 127.611 TiB size 77.480 MiB access 1.000 hz age 0 ns df-passed 78.000 MiB 9 addr 127.611 TiB size 573.102 MiB access 1.000 hz age 0 ns df-passed 574.000 MiB 10 addr 127.612 TiB size 245.617 MiB access 2.000 hz age 0 ns df-passed 246.000 MiB 11 addr 127.612 TiB size 295.102 MiB access 1.000 hz age 1 s df-passed 294.000 MiB 12 addr 127.612 TiB size 295.105 MiB access 1.000 hz age 1 s df-passed 296.000 MiB 13 addr 127.613 TiB size 67.172 MiB access 1.000 hz age 1 s df-passed 66.000 MiB 14 addr 127.613 TiB size 604.570 MiB access 0 hz age 1 s df-passed 606.000 MiB 15 addr 127.613 TiB size 389.578 MiB access 0 hz age 4 s df-passed 388.000 MiB 16 addr 127.614 TiB size 259.719 MiB access 0 hz age 4 s df-passed 260.000 MiB 17 addr 127.614 TiB size 817.941 MiB access 0 hz age 4 s df-passed 818.000 MiB 18 addr 127.615 TiB size 204.488 MiB access 0 hz age 4 s df-passed 204.000 MiB 19 addr 127.615 TiB size 730.902 MiB access 0 hz age 4 s df-passed 732.000 MiB 20 addr 127.616 TiB size 182.727 MiB access 0 hz age 4 s df-passed 182.000 MiB 21 addr 127.616 TiB size 926.824 MiB access 0 hz age 2 s df-passed 928.000 MiB 22 addr 127.617 TiB size 102.984 MiB access 0 hz age 2 s df-passed 102.000 MiB 23 addr 127.617 TiB size 86.527 MiB access 0 hz age 2 s df-passed 86.000 MiB 24 addr 127.617 TiB size 778.777 MiB access 0 hz age 2 s df-passed 776.000 MiB 25 addr 127.999 TiB size 132.000 KiB access 0 hz age 6 s df-passed 0 B memory bw estimate: 6.524 GiB per second df-passed: 6.527 GiB per second total size: 10.731 GiB df-passed 10.000 GiB record DAMON intervals: sample 100 ms, aggr 1 s $ # Show DAMON-generated access pattern snapshot again $ sudo ./damo/damo report access --snapshot_damos_filter allow \ hugepage_size 2MiB 2MiB heatmap: # min/max temperatures: -1,100,000,000, 2,000, column size: 137.352 MiB intervals: sample 100 ms aggr 1 s (max access hz 10) # damos filters (df): reject none hugepage_size [2.000 MiB, 2.000 MiB] df-pass: # min/max temperatures: -900,000,000, 2,000, column size: 128.031 MiB 0 addr 85.373 TiB size 745.555 MiB access 0 hz age 11 s df-passed 0 B 1 addr 127.608 TiB size 579.715 MiB access 2.000 hz age 0 ns df-passed 580.000 MiB 2 addr 127.608 TiB size 144.930 MiB access 2.000 hz age 0 ns df-passed 146.000 MiB 3 addr 127.608 TiB size 452.453 MiB access 2.000 hz age 0 ns df-passed 452.000 MiB 4 addr 127.609 TiB size 113.117 MiB access 1.000 hz age 0 ns df-passed 114.000 MiB 5 addr 127.609 TiB size 182.367 MiB access 2.000 hz age 0 ns df-passed 182.000 MiB 6 addr 127.609 TiB size 182.371 MiB access 2.000 hz age 0 ns df-passed 182.000 MiB 7 addr 127.609 TiB size 350.488 MiB access 1.000 hz age 0 ns df-passed 350.000 MiB 8 addr 127.610 TiB size 525.738 MiB access 1.000 hz age 0 ns df-passed 526.000 MiB 9 addr 127.610 TiB size 401.352 MiB access 1.000 hz age 0 ns df-passed 402.000 MiB 10 addr 127.611 TiB size 100.340 MiB access 1.000 hz age 0 ns df-passed 100.000 MiB 11 addr 127.611 TiB size 19.523 MiB access 0 hz age 0 ns df-passed 20.000 MiB 12 addr 127.611 TiB size 175.727 MiB access 0 hz age 0 ns df-passed 176.000 MiB 13 addr 127.611 TiB size 106.629 MiB access 0 hz age 0 ns df-passed 106.000 MiB 14 addr 127.611 TiB size 959.676 MiB access 0 hz age 0 ns df-passed 960.000 MiB 15 addr 127.612 TiB size 424.469 MiB access 1.000 hz age 0 ns df-passed 424.000 MiB 16 addr 127.612 TiB size 424.469 MiB access 1.000 hz age 0 ns df-passed 424.000 MiB 17 addr 127.613 TiB size 201.648 MiB access 0 hz age 6 s df-passed 202.000 MiB 18 addr 127.613 TiB size 806.609 MiB access 0 hz age 6 s df-passed 806.000 MiB 19 addr 127.614 TiB size 862.125 MiB access 0 hz age 9 s df-passed 862.000 MiB 20 addr 127.614 TiB size 215.535 MiB access 0 hz age 9 s df-passed 216.000 MiB 21 addr 127.615 TiB size 104.500 MiB access 0 hz age 9 s df-passed 104.000 MiB 22 addr 127.615 TiB size 940.523 MiB access 0 hz age 9 s df-passed 942.000 MiB 23 addr 127.616 TiB size 640.281 MiB access 0 hz age 7 s df-passed 640.000 MiB 24 addr 127.616 TiB size 426.855 MiB access 0 hz age 7 s df-passed 426.000 MiB 25 addr 127.617 TiB size 90.105 MiB access 0 hz age 7 s df-passed 90.000 MiB 26 addr 127.617 TiB size 810.965 MiB access 0 hz age 7 s df-passed 808.000 MiB 27 addr 127.999 TiB size 132.000 KiB access 0 hz age 11 s df-passed 0 B memory bw estimate: 5.297 GiB per second df-passed: 5.297 GiB per second total size: 10.731 GiB df-passed 10.000 GiB record DAMON intervals: sample 100 ms, aggr 1 s As you can see the total df-passed region is 10GiB and the hot region moves as the seq read keeps going Revision History ================ Changes from v3 [3]: - Fix some naming issues and improper text in cover letter raise by SJ. Changes from v2 [2]: - Fix some naming and format issues raised by SJ. Changes from v1 [1]: - Follow David's advise to combine *pmd_entry() and *pte_entry() into one. Also remove manually setting walk->action - Use vma_normal_page and vma_normal_page_pmd instead of damon_get_folio to remove redundant folio_get and folio_put - Follow SJ's advise to only move damon_pa_scheme_has_filter to ops-common - Change the command used in cover-letter for more natural illustration [1] https://lore.kernel.org/all/cover.1753794408.git.pyyjason@gmail.com/ [2] https://lore.kernel.org/all/cover.1753895066.git.pyyjason@gmail.com/ [3] https://lore.kernel.org/all/cover.1754088635.git.pyyjason@gmail.com/ Yueyang Pan (2): mm/damon/paddr: move filters existence check function to ops-common mm/damon/vaddr: support stat-purpose DAMOS filters mm/damon/ops-common.c | 9 ++++ mm/damon/ops-common.h | 2 + mm/damon/paddr.c | 11 +---- mm/damon/vaddr.c | 103 +++++++++++++++++++++++++++++++++++++++++- 4 files changed, 114 insertions(+), 11 deletions(-) -- 2.43.0