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 4C307747F for ; Sun, 26 Oct 2025 19:45:49 +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=1761507950; cv=none; b=u/kgcxwuSFLAAbQCAtQBtW3YKeu/u8OVc3UW+nG1P/ckIATr+yOLGjGXbf1jtGrvVdaj5vnwDyq0GpKuY4um6BMcAM80OOArA/CDk4tyrhpHXTJnwRB1NuR6A0SmOpZHhn6cSCCRDBg8ZikHwME5V/fcenrwDVa5bJMd05HKyH8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761507950; c=relaxed/simple; bh=W9BCuieWT+RTBXcGeOi7ZxWKoqjdXIPLehjH/viHvos=; h=Date:To:From:Subject:Message-Id; b=i7jI7UjpCodLVMbSw6dJnUyUBekb4nGIesVFxgBUbBIvbLVL2K+BCUsT/h8dnSpIMppaYYyrM69piEUpc3gsSns02YvDmW7LIkmqjS7cAS1VSYGN/kJjhJ9qFpc+gajJNWF7ivBnIYjyi0ngLiyaQt00CfNB6NBJVyd1AJOuWP4= 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=pQAO+q7L; 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="pQAO+q7L" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BFC15C4CEE7; Sun, 26 Oct 2025 19:45:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1761507949; bh=W9BCuieWT+RTBXcGeOi7ZxWKoqjdXIPLehjH/viHvos=; h=Date:To:From:Subject:From; b=pQAO+q7Lep97KSUtnH31sZ6m96SKaNlhHUUmw+93HG1VEA4m1gYIsXwOAIlzARJ8B m9mVwd8oG5tTE3uVNE6kSFMBE+APUXTr9k4XZFfPZAY91BnGXROO088EAW8XtOHsU7 KuTKgy39JbHk2X9aHzsYhK+RieGJ32OibqgrdcpM= Date: Sun, 26 Oct 2025 12:45:49 -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-stat-document-aggr_interval_us-parameter.patch added to mm-unstable branch Message-Id: <20251026194549.BFC15C4CEE7@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/stat: document aggr_interval_us parameter has been added to the -mm mm-unstable branch. Its filename is docs-admin-guide-mm-damon-stat-document-aggr_interval_us-parameter.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-stat-document-aggr_interval_us-parameter.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/stat: document aggr_interval_us parameter Date: Sun, 26 Oct 2025 11:22:12 -0700 Commit cc7ceb1d14b0 ("mm/damon/stat: expose the current tuned aggregation interval"), has introduced 'aggr_interval_us' parameter for DAMON_STAT. But the new parameter is not yet documented. Document it on the usage document for the module. Link: https://lkml.kernel.org/r/20251026182216.118200-8-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/stat.rst | 18 +++++++++++++++++- 1 file changed, 17 insertions(+), 1 deletion(-) --- a/Documentation/admin-guide/mm/damon/stat.rst~docs-admin-guide-mm-damon-stat-document-aggr_interval_us-parameter +++ a/Documentation/admin-guide/mm/damon/stat.rst @@ -10,6 +10,8 @@ on the system's entire physical memory u access monitoring results statistics, namely idle time percentiles and estimated memory bandwidth. +.. _damon_stat_monitoring_accuracy_overhead: + Monitoring Accuracy and Overhead ================================ @@ -19,7 +21,9 @@ overhead minimum. It auto-tunes the int events to be captured in each snapshot, while limiting the resulting sampling interval to be 5 milliseconds in minimum and 10 seconds in maximum. On a few production server systems, it resulted in consuming only 0.x % single CPU time, -while capturing reasonable quality of access patterns. +while capturing reasonable quality of access patterns. The tuning-resulting +intervals can be retrieved via ``aggr_interval_us`` :ref:`parameter +`. Interface: Module Parameters ============================ @@ -41,6 +45,18 @@ You can enable DAMON_STAT by setting the Setting it as ``N`` disables DAMON_STAT. The default value is set by ``CONFIG_DAMON_STAT_ENABLED_DEFAULT`` build config option. +.. _damon_stat_aggr_interval_us: + +aggr_interval_us +---------------- + +Auto-tuned aggregation time interval in microseconds. + +Users can read the aggregation interval of DAMON that is being used by the +DAMON instance for DAMON_STAT. It is :ref:`auto-tuned +` and therefore the value is +dynamically changed. + estimated_memory_bandwidth -------------------------- _ 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