From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 198C434D917 for ; Sun, 8 Mar 2026 20:36:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773002181; cv=none; b=HfLKaAB5DOjLt1uCShBY9BjcOOM8vvbhh0gjz3b5ryYIxCQVdrVxC4wqqmXJQjoTzDLlKPYvClyA5BpW/RkH2HxK5n0yX/z3FOh+VJX5W2+Kxl9yBcOjc9rRLE6nlwAl7QZZ9yPWOqkJspPw7/Y/KW3nb2cbu8Ia4luWeLsPpog= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1773002181; c=relaxed/simple; bh=nwUmpz9aiA4lk7n8IMO0nXRINC8SIo8rASXHJxYLbvk=; h=Date:To:From:Subject:Message-Id; b=G/jloR83Usas93FsAxqdcD1bcJsuiwgiNmxqUSF0y1xNlWUdQA2Iowls2zFAJHE7sQ5Iln+Yf0Fc76y6ybux9xlU4CYGu50UWTyJvXGVwDgV47wjIYtKJWFT8YdjUs/CLwmYKgPG8kYN+Oz0igG08hMA08KBpIVGVs+cJk0mYZI= 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=siAAZYkK; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="siAAZYkK" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ACE3AC116C6; Sun, 8 Mar 2026 20:36:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1773002180; bh=nwUmpz9aiA4lk7n8IMO0nXRINC8SIo8rASXHJxYLbvk=; h=Date:To:From:Subject:From; b=siAAZYkKeX8+AY2pAM1oK/Q/cgSWflGCilZkwl1knz5st7ffAfk73bsgo/3Ersajq F0TAh1H5kgwt82vCfq86akoQODJHJjYwZRUqrBOXHsu34oATvufSzr6vn5nsjCaQjF oCwoR3T+DrYbJv0m/zhh2DBHfG7ywIjaZodBd+kY= Date: Sun, 08 Mar 2026 13:36:20 -0700 To: mm-commits@vger.kernel.org,vbabka@kernel.org,surenb@google.com,skhan@linuxfoundation.org,rppt@kernel.org,mhocko@suse.com,ljs@kernel.org,liam.howlett@oracle.com,david@kernel.org,davidgow@google.com,corbet@lwn.net,brendan.higgins@linux.dev,sj@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + mm-damon-document-non-zero-length-damon_region-assumption.patch added to mm-new branch Message-Id: <20260308203620.ACE3AC116C6@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: document non-zero length damon_region assumption has been added to the -mm mm-new branch. Its filename is mm-damon-document-non-zero-length-damon_region-assumption.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-document-non-zero-length-damon_region-assumption.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: SeongJae Park Subject: mm/damon: document non-zero length damon_region assumption Date: Sat, 7 Mar 2026 11:53:52 -0800 DAMON regions are assumed to always be non-zero length. There was a confusion [1] about it, probably due to lack of the documentation. Document it. Link: https://lkml.kernel.org/r/20260307195356.203753-5-sj@kernel.org Link: https://lore.kernel.org/20251231070029.79682-1-sj@kernel.org/ [1] Signed-off-by: SeongJae Park Cc: Brendan Higgins Cc: David Gow Cc: David Hildenbrand Cc: Jonathan Corbet Cc: Liam Howlett Cc: Lorenzo Stoakes (Oracle) Cc: Michal Hocko Cc: Mike Rapoport Cc: Shuah Khan Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- include/linux/damon.h | 2 ++ 1 file changed, 2 insertions(+) --- a/include/linux/damon.h~mm-damon-document-non-zero-length-damon_region-assumption +++ a/include/linux/damon.h @@ -55,6 +55,8 @@ struct damon_size_range { * @list: List head for siblings. * @age: Age of this region. * + * For any use case, @ar should be non-zero positive size. + * * @nr_accesses is reset to zero for every &damon_attrs->aggr_interval and be * increased for every &damon_attrs->sample_interval if an access to the region * during the last sampling interval is found. The update of this field should _ Patches currently in -mm which might be from sj@kernel.org are mm-damon-core-set-quota-score-histogram-with-core-filters.patch mm-damon-core-do-non-safe-region-walk-on-kdamond_apply_schemes.patch mm-damon-core-split-regions-for-min_nr_regions.patch mm-damon-vaddr-do-not-split-regions-for-min_nr_regions.patch mm-damon-test-core-kunit-add-damon_apply_min_nr_regions-test.patch mm-damon-add-config_damon_debug_sanity.patch mm-damon-core-add-damon_new_region-debug_sanity-check.patch mm-damon-core-add-damon_del_region-debug_sanity-check.patch mm-damon-core-add-damon_nr_regions-debug_sanity-check.patch mm-damon-core-add-damon_merge_two_regions-debug_sanity-check.patch mm-damon-core-add-damon_merge_regions_of-debug_sanity-check.patch mm-damon-core-add-damon_split_region_at-debug_sanity-check.patch mm-damon-core-add-damon_reset_aggregated-debug_sanity-check.patch mm-damon-tests-kunitconifg-enable-damon_debug_sanity.patch selftests-damon-config-enable-damon_debug_sanity.patch mm-damon-tests-core-kunit-add-a-test-for-damon_commit_ctx.patch docs-mm-damon-design-document-the-power-of-two-limitation-for-addr_unit.patch mm-damon-core-remove-damos_set_next_apply_sis-duplicates.patch mm-damon-core-use-time_before-for-next_apply_sis.patch mm-damon-core-use-time_after_eq-in-kdamond_fn.patch mm-damon-core-use-mult_frac.patch mm-damon-tests-core-kunit-add-a-test-for-damon_is_last_region.patch mm-damon-core-clarify-damon_set_attrs-usages.patch mm-damon-document-non-zero-length-damon_region-assumption.patch docs-admin-guide-mm-damn-lru_sort-fix-intervals-autotune-parameter-name.patch docs-mm-damon-maintainer-profile-use-flexible-review-cadence.patch docs-mm-damon-index-fix-typo-autoamted-automated.patch