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 A5F8A2B9BA for ; Thu, 2 Jul 2026 00:23:05 +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=1782951786; cv=none; b=IT8jjhQ+bqoNsvo6HvOegRelouCTYRMgT7MB/dRvQdFWruE6mnA+quYZcSVUuEH9pJHdSOt5116dgNVs8ln6ZY+dPhNh8IWTFUbhDONmb5uCG1QwTK7YtKhLSXjVas9HNDNpr4M4agyATn779EQ8bl/ghWLhJsh3mkdzz4RuDx0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782951786; c=relaxed/simple; bh=JBngguhOIz4wUaLqZw/PYovQ4zSenQSGOLtY0kju2nI=; h=Date:To:From:Subject:Message-Id; b=qONbaL8Aupq4F9zFo7/nuSthk0mRFRaEEiOw+OEaATG86SkM9g/L5C25z/uQQ8+bBD8QfG01MbiQCZvP03pYUc0hfvkLZqhGBCf0V6SKgDDcfS0EhuBNwl5UyvBw70hPJpdEBTJfARiB0dXY0zzX1aBNOj54mDEBrDQeu0+aTlE= 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=kSM3MTzM; 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="kSM3MTzM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 32C361F000E9; Thu, 2 Jul 2026 00:23:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1782951785; bh=JMOLS2l0cseFgCuT7TmKc5GgbEHFHAzBkbp49DS/514=; h=Date:To:From:Subject; b=kSM3MTzMP0+0/XjyW87ZMAnCRo6CQlWTHxFzEHtPxqWfXHtBYMQgCKDu0wVr03R3f DrHlLKJFBZEYnMwIX1MI1T3AvIrVnV5NB7P8rA7/qS/CE+Lt+4N02K26Tn4pif+yBP kyMVDaKsBzMRVpwm6xfZFh2mqD7FbCF2/ju8sHaU= Date: Wed, 01 Jul 2026 17:23:04 -0700 To: mm-commits@vger.kernel.org,sj@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-damon-core-handle-unreset-nr_accesses-in-damon_nr_accesses_mvsum.patch added to mm-new branch Message-Id: <20260702002305.32C361F000E9@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: mm/damon/core: handle unreset nr_accesses in damon_nr_accesses_mvsum() has been added to the -mm mm-new branch. Its filename is mm-damon-core-handle-unreset-nr_accesses-in-damon_nr_accesses_mvsum.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-core-handle-unreset-nr_accesses-in-damon_nr_accesses_mvsum.patch This patch will later appear in the mm-new branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm Note, mm-new is a provisional staging ground for work-in-progress patches, and acceptance into mm-new is a notification for others take notice and to finish up reviews. Please do not hesitate to respond to review feedback and post updated versions to replace or incrementally fixup patches in mm-new. The mm-new branch of mm.git is not included in linux-next If a few days of testing in mm-new is successful, the patch will me moved into mm.git's mm-unstable branch, which is included in linux-next Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/process/submit-checklist.rst when testing your code *** The -mm tree is included into linux-next via various branches at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there most days ------------------------------------------------------ From: SJ Park Subject: mm/damon/core: handle unreset nr_accesses in damon_nr_accesses_mvsum() Date: Mon, 29 Jun 2026 21:07:57 -0700 damon_set_attrs() works like reverting aggregations that were made so far for this aggregation window. If this is the end of the aggregation, however, kdamond_fn() will do the operations at the end of the aggregation interval, using cached timestamps. For such operations that rely on damon_region->nr_accesses, damon_update_monitoring_results() doesn't reset the nr_accesses if it is called at the end of the aggregation window. damon_nr_accesses_mvsum() works with fresh timestamps, though. The nr_accesses that are not reset in this case can make the logic to unnecessarily count nr_accesses, resulting in returning higher-than-expected pseudo moving sum nr_accesses. No code is using damon_nr_accesses_mvsum() yet, so this is not causing a real problem. Following commits will add usage of the function, though. For safe usages, calculate the pseudo moving sum without nr_accesses if the remaining window is full. Link: https://lore.kernel.org/20260630040812.149729-5-sj@kernel.org Signed-off-by: SJ Park Cc: Brendan Higgins Cc: "Masami Hiramatsu (Google)" Cc: Mathieu Desnoyers Cc: Shuah Khan Cc: Steven Rostedt Signed-off-by: Andrew Morton --- mm/damon/core.c | 3 +++ 1 file changed, 3 insertions(+) --- a/mm/damon/core.c~mm-damon-core-handle-unreset-nr_accesses-in-damon_nr_accesses_mvsum +++ a/mm/damon/core.c @@ -266,6 +266,9 @@ unsigned int damon_nr_accesses_mvsum(str ctx->passed_sample_intervals; left_window_bp = mult_frac(left_window, 10000, window_len); + if (left_window_bp == 10000) + return r->last_nr_accesses; + return damon_mvsum(r->nr_accesses, r->last_nr_accesses, left_window_bp); } _ Patches currently in -mm which might be from sj@kernel.org are mm-damon-sysfs-schemes-fix-dir-put-orders-in-access_pattern_add_dirs.patch mm-damon-sysfs-schemes-put-stats-for-scheme_add_dirs-internal-error.patch mm-damon-ops-common-handle-extreme-intervals-in-damon_hot_score.patch mm-damon-add-a-kernel-doc-comment-for-damon_ctx-probes.patch mm-damon-add-a-kernel-doc-comment-for-damon_ctx-rnd_state.patch maintainers-s-seongjae-sj.patch samples-damon-wsse-handle-damon_start-failure.patch samples-damon-prcl-handle-damon_start-failure.patch samples-damon-mtier-handle-damon_start-failure.patch samples-damon-mtier-handle-damon_stop-failure.patch samples-damon-wsse-stop-and-free-damon-ctx-when-damon_call-fails.patch samples-damon-prcl-stop-and-free-damon-ctx-when-damon_call-fails.patch mm-damon-sysfs-kobject_del-target-normal-context-and-kdamond-dirs.patch mm-damon-sysfs-kobject_del-region-and-target-error-dirs.patch mm-damon-sysfs-schemes-kobject_del-scheme-dirs.patch mm-damon-sysfs-schemes-kobject_del-scheme-region-dirs.patch mm-damon-sysfs-schemes-kobject_del-scheme-filter-dirs.patch mm-damon-sysfs-schemes-kobject_del-scheme-quota-goal-dirs.patch mm-damon-sysfs-schemes-kobject_del-scheme-action-destination-dirs.patch mm-damon-sysfs-kobject_del-probe-dirs.patch mm-damon-sysfs-kobject_del-probe-filter-dirs.patch mm-damon-sysfs-kobject_del-probe-dirs-in-probes_addd_dir-error-path.patch mm-damon-sysfs-schemes-kobject_del-region-for-populate_region-error.patch docs-mm-damon-design-update-for-damos_quota_node_eligible_mem_bp.patch docs-abi-damon-document-probe-files.patch mm-damon-tests-core-kunit-test-damon_rand.patch selftests-damon-sysfssh-test-multiple-probe-dirs-creation.patch selftests-damon-sysfssh-test-coreops_filters-directories.patch selftests-damon-sysfssh-test-dests-dir.patch selftests-damon-sysfssh-test-all-files-in-quota-goal-dir.patch mm-damon-core-reduce-range-setup-in-damon_commit_target_regions.patch mm-damon-sysfs-split-probe-setup-function-out.patch mm-damon-sysfs-split-out-filters-setup-function.patch mm-damon-sysfs-fix-typos-in-probe_addrm_dirs-s-attr-probe.patch mm-damon-core-introduce-damon_nr_accesses_mvsum.patch mm-damon-tests-core-kunit-test-damon_mvsum.patch mm-damon-core-always-update-last_nr_accesses-for-intervals-change.patch mm-damon-core-handle-unreset-nr_accesses-in-damon_nr_accesses_mvsum.patch mm-damon-core-use-damon_nr_accesses_mvsum-in-__damos_valid_target.patch mm-damon-core-use-damon_nr_accesses_mvsum-for-damos-region-tracing.patch mm-damon-sysfs-schemes-use-damon_nr_accesses_mvsum-for-damo-regions.patch mm-damon-core-remove-damon_warn_fix_nr_accesses_corruption.patch mm-damon-core-remove-damon_verify_reset_aggregated.patch mm-damon-core-remove-damon_verify_merge_regions_of.patch mm-damon-tests-core-kunit-remove-nr_accesses_bp-setup-and-tests.patch selftests-damon-drgn_dump_damon_status-do-not-dump-nr_accesses_bp.patch mm-damon-core-remove-nr_accesses_bp-setups-and-updates.patch mm-damon-core-remove-attrs-param-from-damon_update_region_access_rate.patch mm-damon-paddr-remove-attrs-param-from-__damon_pa_check_access.patch mm-damon-vaddr-remove-attrs-param-from-__damon_va_check_access.patch mm-damon-core-remove-damon_moving_sum-and-its-unit-test.patch mm-damon-core-remove-damon_region-nr_accesses_bp.patch