linux-kernel - [RFC PATCH v3 32/37] Docs/admin-guide/mm/damon/usage: document tids

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Message-ID: <20251208062943.68824-33-sj@kernel.org>
Date: Sun,  7 Dec 2025 22:29:36 -0800
From: SeongJae Park <sj@...nel.org>
To: 
Cc: SeongJae Park <sj@...nel.org>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...nel.org>,
	Jonathan Corbet <corbet@....net>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Michal Hocko <mhocko@...e.com>,
	Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	damon@...ts.linux.dev,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC PATCH v3 32/37] Docs/admin-guide/mm/damon/usage: document tids_arr file

Update DAMON usage document for the threads based access sampling
results filtering.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 Documentation/admin-guide/mm/damon/usage.rst | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst
index 365a4548a5ba..d22d80710355 100644
--- a/Documentation/admin-guide/mm/damon/usage.rst
+++ b/Documentation/admin-guide/mm/damon/usage.rst
@@ -67,7 +67,7 @@ comma (",").
     │ │ │ │ │ │ │ intervals_goal/access_bp,aggrs,min_sample_us,max_sample_us
     │ │ │ │ │ │ sample/primitives/page_table,page_faults
     │ │ │ │ │ │ sample/filters/nr_filters
-    │ │ │ │ │ │ │ 0/type,matching,allow,cpumask
+    │ │ │ │ │ │ │ 0/type,matching,allow,cpumask,tid_arr
     │ │ │ │ │ │ nr_regions/min,max
     │ │ │ │ │ :ref:`targets <sysfs_targets>`/nr_targets
     │ │ │ │ │ │ :ref:`0 <sysfs_target>`/pid_target,obsolete_target
@@ -260,13 +260,14 @@ context, in the order of the directory names.  Writing ``0`` to ``nr_filters``
 removes the directories.
 
 Under the individual filter directory, five files, ``type``, ``matching``,
-``allow``, and ``cpumask`` exist.  The first three files are same to the
-properties of the filter specified on the :ref:`design doc
+``allow``, ``cpumask`` and ``tid_arr`` exist.  The first three files are same
+to the properties of the filter specified on the :ref:`design doc
 <damon_design_sampling_results_filters>`.
 
-Users can specify the cpumask of the filter by writing it to ``cpumask``.  The
-format for ``cpumask`` input is same to that for other cpumask inputs like that
-for cgroup cpusets.
+Users can specify the cpumask and thread id array of the filter by writing
+those to ``cpumask`` and ``tid_arr``.  The format for ``cpumask`` input is same
+to that for other cpumask inputs like that for cgroup cpusets.  For
+``tid_arr``, users can write array of the thread ids, separated by a comma.
 
 .. _damon_usage_sysfs_monitoring_intervals_goal:
 
-- 
2.47.3