From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C04FD31AF2D; Wed, 7 Oct 2026 00:52:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791334333; cv=none; b=ATTTxFR31eX2NKwhW3LUSnIWJ2mIzQRWLFXQywBE5+T4yj66+hHR26ujQGMlet0HMJ0WYDX2TCzV3YB0OJRUrAkn842P0fM8hFeSHzAgx1ebfMmy4ZUiv3vLn7dSw+aK+skkoBkYPa3B9JJ4FIWy2V4tJ/kWrso5Z+CULpg9Pq8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791334333; c=relaxed/simple; bh=oqV4ri1UiQp+oy3uCtc8EDYx0zdaWkHrPYVxsVrOV70=; h=Date:To:From:Subject:Message-Id; b=IV3NAd7XbDH7OvsGnxqpPyd8kNR6hT5W7rmNlL4i6DMlGOBRzVox/rmSGrUDj/Hm5StOt1XeY0XZAJJT61+aT+QP9GCD2MiuzS3h8ujSF/13adwfvyWi4ezfT2+uDqjd7JslYQUSPYOM3tO+vbh/tMR1wZ9vjw1hJ30o5izNtZw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=ui+4nJmz; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="ui+4nJmz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 94C4F1F0089F; Wed, 7 Oct 2026 00:52:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1791334331; bh=EdkepBb2oNjYl0sh9nalm7l0Fi94plexW5W6fxvPfU8=; h=Date:To:From:Subject; b=ui+4nJmz6NliLxWoiyShvTYqN48Ymlqt4JPmbYzGEedC8UZPJGteRPM8cLnvfLAHW IH3Q5D3c9DLUejybtSTzjti1rlA9AHQYL0nEmkDYnCh0Re2viuMg/OJcfCMZUxzI9c Cl/BfDZ94jTXy0FzkNH4ZBQ0ch62bGtjPXh8YGkI= Date: Tue, 06 Oct 2026 17:52:11 -0700 To: mm-commits@vger.kernel.org,usamaarif642@gmail.com,stable@vger.kernel.org,sj@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: [merged mm-stable] mm-damon-vaddr-respect-folio-end-for-damos_migrate_hotcold.patch removed from -mm tree Message-Id: <20261007005211.94C4F1F0089F@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The quilt patch titled Subject: mm/damon/vaddr: respect folio end for DAMOS_MIGRATE_{HOT,COLD} has been removed from the -mm tree. Its filename was mm-damon-vaddr-respect-folio-end-for-damos_migrate_hotcold.patch This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm ------------------------------------------------------ From: SJ Park Subject: mm/damon/vaddr: respect folio end for DAMOS_MIGRATE_{HOT,COLD} Date: Tue, 1 Sep 2026 06:18:46 -0700 For applying DAMOS_MIGRATE_{HOT,COLD} actions to a region, DAMON virtual address space operation set (vaddr) calls walk_page_range[_vma]() for the region. The pmd walk entry function, namely damon_va_migrate_pmd_entry(), collects folios of addresses of the region in the pmd. It starts from the walking address and advances the address by the size of the folio of the address until it goes out of the pmd or the region. Let's suppose it is for the first pmd of the region, and the region start address is in the middle of a large folio. Also, the next folios are small. Then, some of the next folios could be skipped. Fix the issue by advancing the address to exactly the start address of the next folio. The user impact is that DAMOS action is applied to less than expected amount of memory. Given the best effort nature of DAMON, it is no big problem, but it is clearly a bug that is better to be fixed. The issue was discovered [1] by Sashiko. Link: https://lore.kernel.org/20260901131850.98037-6-sj@kernel.org Link: https://lore.kernel.org/20260514015053.149396-1-sj@kernel.org [1] Fixes: 09efc56a3b1c ("mm/damon/vaddr: consistently use only pmd_entry for damos_migrate") Signed-off-by: SJ Park Signed-off-by: Andrew Morton Cc: Usama Arif Cc: # 6.19.x --- mm/damon/vaddr.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/mm/damon/vaddr.c~mm-damon-vaddr-respect-folio-end-for-damos_migrate_hotcold +++ a/mm/damon/vaddr.c @@ -676,6 +676,8 @@ huge_out: return 0; for (; addr < next; pte += nr, addr += nr * PAGE_SIZE) { + unsigned long page_idx; + nr = 1; ptent = ptep_get(pte); @@ -688,7 +690,8 @@ huge_out: continue; damos_va_migrate_dests_add(folio, walk->vma, addr, dests, migration_lists); - nr = folio_nr_pages(folio); + page_idx = folio_page_idx(folio, pte_page(ptent)); + nr = folio_nr_pages(folio) - page_idx; } pte_unmap_unlock(start_pte, ptl); return 0; _ Patches currently in -mm which might be from sj@kernel.org are mm-damon-core-use-damon_nr_samples_per_aggr-for-max-merge-threshold.patch mm-damon-core-remove-debug-messages.patch mm-damon-core-remove-debug-messages-fix.patch mm-damon-vaddr-remove-a-debug-message.patch mm-damon-core-validate-number-of-probes-in-valid_probe_params.patch mm-damon-sysfs-remove-probes-number-validation.patch mm-damon-tests-core-kunit-extend-set_regions-test-for-error-case.patch mm-damon-tests-core-kunit-test-=0-size-damon_set_regions-inputs.patch mm-damon-tests-core-kunit-test-overlapping-ranges-for-set_regions.patch mm-damon-tests-core-kunit-test-damon_nr_samples_per_aggr.patch selftests-damon-sysfssh-test-hugepage_mem_bp-quota-goal.patch docs-mm-damon-maintainer-profile-update-ai-review-for-sashiko-replies.patch docs-abi-damon-recommend-subsystem-doc-instead-of-admin-guide.patch mm-damon-core-error-damos_commit_quota_goal-for-zero-target_value.patch revert-mm-damon-lru_sort-error-out-for-10000-active_mem_bp.patch revert-samples-damon-mtier-error-out-for-zero-quota-goal-target-values.patch mm-damon-core-handle-null-ctx-parameter-in-damon_call.patch mm-damon-core-set-ctx-call_controls_obsolete-in-damon_new_ctx.patch mm-damon-reclaim-remove-unnecessary-damon_call-param-validation.patch mm-damon-lru_sort-remove-unnecessary-damon_call-param-validation.patch mm-damon-vaddr-support-prep_probes.patch mm-damon-paddr-move-probe-filter-handling-to-ops-common.patch mm-damon-vaddr-support-apply_probe.patch mm-damon-vaddr-extend-apply_probes-for-hugetlb.patch mm-damon-vaddr-support-pgidle_unset-probe-filter-type.patch mm-damon-api-introduce-damon_filter_type_pgidle_set.patch mm-damon-paddr-support-damon_filter_type_pgidle_set.patch mm-damon-vaddr-support-damon_filter_type_pgidle_set.patch mm-damon-sysfs-support-damon_filter_type_pgidle_set.patch docs-mm-damon-design-update-for-pgidle_set-probe-filter.patch mm-damon-api-introduce-damos_filter_type_probe_hits_wsum.patch mm-damon-api-introduce-damos_filter_type_probe_hits_wsum-fix.patch mm-damon-core-extend-probe_hits_wsum-for-moving-sum-based-calculation.patch mm-damon-core-support-probe_hits_wsum-damos-core-filter.patch mm-damon-sysfs-schemes-rename-sysfs_filter-sz_range-to-range_minmax.patch mm-damon-sysfs-schemes-support-probe_hits_wsum-damos-core-filter.patch docs-mm-damon-design-update-for-probe_hits_wsum-damos-core-filter.patch docs-admin-guide-mm-damon-usage-update-for-probe_hits_wsum-damos-filter.patch mm-damon-sysfs-schemes-read-sysfs_filter-addr_range-only-once.patch mm-damon-sysfs-schemes-read-sysfs_filter-sz_range-only-once.patch mm-damon-core-return-an-error-from-damos_commit_filter_arg.patch mm-damon-core-disallow-max-min-damos-filter-range-arguments-commit.patch mm-damon-sysfs-schemes-drop-centralized-filter-range-arg-validations.patch mm-damon-sysfs-schemes-use-switch-case-in-add_scheme_filters.patch mm-damon-core-kunit-extend-damos_commit_filter_for-for-wrong-input.patch mm-damon-core-kunit-test-invalid-damos-filter-commits.patch mm-damon-api-introduce-damon_filter_type_hugepage_size.patch mm-damon-core-commit-hugepage_size-type-damon-filter.patch mm-damon-ops-common-support-hugepage_size-damon-filter-matching.patch mm-damon-sysfs-add-minmax-files-under-probe-filter-directory.patch mm-damon-sysfs-support-hugepage_size-probe-filter.patch docs-mm-damon-design-update-for-hugepage_size-probe-filter.patch docs-admin-guide-mm-damon-usage-update-for-hugepage_size.patch docs-abi-damon-update-for-hugepage_size-probe-filter.patch mm-damon-api-remove-nr_damos_filter_types.patch mm-damon-core-use-abs_diff-in-damon_feed_loop_next_input.patch mm-damon-core-use-mult_frac-in-damon_feed_loop_next_input.patch mm-damon-core-set-damon_ctx-walk_control_obsolete-in-damon_new_ctx.patch mm-damon-core-document-damon_call-damon_start-race-hang-issue.patch mm-damon-paddr-remove-pa-parameter-from-damon_pa_filter_pass.patch mm-damon-tests-core-kunit-test-eligible_mem_bp-commitment.patch mm-damon-tests-core-kunit-add-probe_hits_wsum-damos-filter-commit-test.patch selftests-damon-sysfs_memcg_path_leak-fail-only-for-real-damon-leak.patch docs-mm-damon-design-clarify-bp-is-basis-point.patch mm-damon-core-introduce-damos_quota_goal-complement.patch mm-damon-core-add-complement-argument-to-damos_new_quota_goal.patch mm-damon-sysfs-schemes-support-quota-goal-complement-flag.patch mm-damon-tests-core-kunit-test-quota_goal-complement-commit.patch selftests-damon-sysfssh-test-quota-goal-complement-flag-file.patch docs-mm-damon-design-document-damos-quota-goal-complement-flag.patch docs-admin-guide-mm-damon-usage-update-for-quota-goal-complement-file.patch docs-abi-damon-update-for-quota-goal-metric-complement-sysfs-file.patch