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 37D5E747F for ; Sun, 26 Oct 2025 19:45:43 +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=1761507944; cv=none; b=oODDdHf3/t0DfGdoRwR8mHEFrjO6GPPwB3nVwcMfskupbQhQoNo/umD19+GgnEXzxfKOvJE625AcmnKUWWZae0s0h0PQ/7PLZA6NqwT/pB5hnezk8AyeWl/dl28f1RMK4qtif7h111xlvIIJ6Sb/SNpzvwWN6ZUnpbf+qOATp8I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761507944; c=relaxed/simple; bh=/ic+qqBMP4iqsIvwhP1wpWTIrIcIdZ4NikI2EXx2VAo=; h=Date:To:From:Subject:Message-Id; b=uKl3JE29D4/BAE0zlUgnhqH4cP0YuLbp2BRCsqHGMFEKOjmOfvz706K6XGQPsPqusNntViojmiml2qe0CHmIEyqzxq20sK683Nzx8yFrHlV7G8CXunviQ/5Op0KV6D6lxf9BP1+3WknglpYUoUnPNwDSZgA4dwmODxozBhlSjVw= 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=c3i8hJs+; 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="c3i8hJs+" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C2CBFC4CEE7; Sun, 26 Oct 2025 19:45:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1761507943; bh=/ic+qqBMP4iqsIvwhP1wpWTIrIcIdZ4NikI2EXx2VAo=; h=Date:To:From:Subject:From; b=c3i8hJs+VI7ZAti1136GgF4NGf3yaDEoy8FalNQhjSBQTkdVkKWNueR/o34RNL7AD LBlRnmI8lEK3dmJWr0Kjj6pY2cfS0H7ejrxWYd9JhJYElr+HsHr3kv4CgY3jIhYvMw RPmfe0deEwBZ6HxBN29sMJWYpfSDxlv0B/FyITp0= Date: Sun, 26 Oct 2025 12:45:43 -0700 To: mm-commits@vger.kernel.org,vbabka@suse.cz,surenb@google.com,rppt@kernel.org,mhocko@suse.com,lorenzo.stoakes@oracle.com,liam.howlett@oracle.com,david@redhat.com,corbet@lwn.net,sj@kernel.org,akpm@linux-foundation.org From: Andrew Morton Subject: + docs-admin-guide-mm-damon-usage-document-empty-target-regions-commit-behavior.patch added to mm-unstable branch Message-Id: <20251026194543.C2CBFC4CEE7@smtp.kernel.org> Precedence: bulk X-Mailing-List: mm-commits@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: The patch titled Subject: Docs/admin-guide/mm/damon/usage: document empty target regions commit behavior has been added to the -mm mm-unstable branch. Its filename is docs-admin-guide-mm-damon-usage-document-empty-target-regions-commit-behavior.patch This patch will shortly appear at https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/docs-admin-guide-mm-damon-usage-document-empty-target-regions-commit-behavior.patch This patch will later appear in the mm-unstable branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm 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 the mm-everything branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm and is updated there every 2-3 working days ------------------------------------------------------ From: SeongJae Park Subject: Docs/admin-guide/mm/damon/usage: document empty target regions commit behavior Date: Sun, 26 Oct 2025 11:22:09 -0700 Committing a monitoring target with empty target regions is for keeping the current monitoring results. This behavior was introduced by commit 973233600676 ("mm/damon/sysfs: update monitoring target regions for online input commit"). The behavior is not documented, though. Update the usage document for clarifying this behavior. Link: https://lkml.kernel.org/r/20251026182216.118200-5-sj@kernel.org Signed-off-by: SeongJae Park Cc: David Hildenbrand Cc: Jonathan Corbet Cc: Liam Howlett Cc: Lorenzo Stoakes Cc: Michal Hocko Cc: Mike Rapoport Cc: Suren Baghdasaryan Cc: Vlastimil Babka Signed-off-by: Andrew Morton --- Documentation/admin-guide/mm/damon/usage.rst | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- a/Documentation/admin-guide/mm/damon/usage.rst~docs-admin-guide-mm-damon-usage-document-empty-target-regions-commit-behavior +++ a/Documentation/admin-guide/mm/damon/usage.rst @@ -134,7 +134,8 @@ Users can write below commands for the k - ``on``: Start running. - ``off``: Stop running. - ``commit``: Read the user inputs in the sysfs files except ``state`` file - again. + again. Monitoring :ref:`target region ` inputs are also be + ignored if no target region is specified. - ``update_tuned_intervals``: Update the contents of ``sample_us`` and ``aggr_us`` files of the kdamond with the auto-tuning applied ``sampling interval`` and ``aggregation interval`` for the files. Please refer to @@ -289,6 +290,11 @@ In the beginning, this directory has onl number (``N``) to the file creates the number of child directories named ``0`` to ``N-1``. Each directory represents each initial monitoring target region. +If ``nr_regions`` is zero when committing new DAMON parameters online (writing +``commit`` to ``state`` file of :ref:`kdamond `), the commit +logic ignores the target regions. In other words, the current monitoring +results for the target are preserved. + .. _sysfs_region: regions// _ Patches currently in -mm which might be from sj@kernel.org are mm-zswap-remove-unnecessary-dlen-writes-for-incompressible-pages.patch mm-zswap-fix-typos-s-zwap-zswap.patch mm-zswap-s-red-black-tree-xarray.patch docs-admin-guide-mm-zswap-s-red-black-tree-xarray.patch mm-damon-document-damos_quota_goal-nid-use-case.patch mm-damon-add-damos-quota-goal-type-for-per-memcg-per-node-memory-usage.patch mm-damon-core-implement-damos_quota_node_memcg_used_bp.patch mm-damon-sysfs-schemes-implement-path-file-under-quota-goal-directory.patch mm-damon-sysfs-schemes-support-damos_quota_node_memcg_used_bp.patch mm-damon-core-add-damos-quota-gaol-metric-for-per-memcg-per-numa-free-memory.patch mm-damon-sysfs-schemes-support-damos_quota_node_memcg_free_bp.patch docs-mm-damon-design-document-damos_quota_node_memcg_usedfree_bp.patch docs-admin-guide-mm-damon-usage-document-damos-quota-goal-path-file.patch docs-abi-damon-document-damos-quota-goal-path-file.patch mm-damon-core-fix-wrong-comment-of-damon_call-return-timing.patch docs-mm-damon-design-fix-wrong-link-to-intervals-goal-section.patch docs-admin-guide-mm-damon-stat-fix-a-typo-s-sampling-events-sampling-interval.patch docs-admin-guide-mm-damon-usage-document-empty-target-regions-commit-behavior.patch docs-admin-guide-mm-damon-reclaim-document-addr_unit-parameter.patch docs-admin-guide-mm-damon-lru_sort-document-addr_unit-parameter.patch docs-admin-guide-mm-damon-stat-document-aggr_interval_us-parameter.patch docs-admin-guide-mm-damon-stat-document-negative-idle-time.patch mm-damon-core-add-damon_target-obsolete-for-pin-point-removal.patch mm-damon-sysfs-test-commit-input-against-realistic-destination.patch mm-damon-sysfs-implement-obsolete_target-file.patch docs-admin-guide-mm-damon-usage-document-obsolete_target-file.patch docs-abi-damon-document-obsolete_target-sysfs-file.patch selftests-damon-_damon_sysfs-support-obsolete_target-file.patch drgn_dump_damon_status-dump-damon_target-obsolete.patch sysfspy-extend-assert_ctx_committed-for-monitoring-targets.patch selftests-damon-sysfs-add-obsolete_target-test.patch