linux-kernel - [PATCH 07/13] Docs/admin-guide/mm/damon/usage: update for address range type DAMOS filter

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Message-Id: <20230802214312.110532-8-sj@kernel.org>
Date:   Wed,  2 Aug 2023 21:43:06 +0000
From:   SeongJae Park <sj@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     SeongJae Park <sj@...nel.org>, Jonathan Corbet <corbet@....net>,
        damon@...ts.linux.dev, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 07/13] Docs/admin-guide/mm/damon/usage: update for address range type DAMOS filter

Update DAMON usage document for the newly added address range type DAMOS
filter.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 Documentation/admin-guide/mm/damon/usage.rst | 31 +++++++++++++-------
 1 file changed, 20 insertions(+), 11 deletions(-)

diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst
index 1859dd6c3834..a9cb9949b796 100644
--- a/Documentation/admin-guide/mm/damon/usage.rst
+++ b/Documentation/admin-guide/mm/damon/usage.rst
@@ -363,15 +363,18 @@ number (``N``) to the file creates the number of child directories named ``0``
 to ``N-1``.  Each directory represents each filter.  The filters are evaluated
 in the numeric order.
 
-Each filter directory contains three files, namely ``type``, ``matcing``, and
-``memcg_path``.  You can write one of two special keywords, ``anon`` for
-anonymous pages, or ``memcg`` for specific memory cgroup filtering.  In case of
-the memory cgroup filtering, you can specify the memory cgroup of the interest
-by writing the path of the memory cgroup from the cgroups mount point to
-``memcg_path`` file.  You can write ``Y`` or ``N`` to ``matching`` file to
-filter out pages that does or does not match to the type, respectively.  Then,
-the scheme's action will not be applied to the pages that specified to be
-filtered out.
+Each filter directory contains five files, namely ``type``, ``matcing``,
+``memcg_path``, ``addr_start``, and ``addr_end``.  To ``type`` file, you can
+write one of three special keywords: ``anon`` for anonymous pages, ``memcg``
+for specific memory cgroup, or ``addr`` for specific address range (an
+open-ended interval) filtering.  In case of the memory cgroup filtering, you
+can specify the memory cgroup of the interest by writing the path of the memory
+cgroup from the cgroups mount point to ``memcg_path`` file.  In case of the
+address range filtering, you can specify the start and end address of the range
+to ``addr_start`` and ``addr_end`` files, respectively.  You can write ``Y`` or
+``N`` to ``matching`` file to filter out pages that does or does not match to
+the type, respectively.  Then, the scheme's action will not be applied to the
+pages that specified to be filtered out.
 
 For example, below restricts a DAMOS action to be applied to only non-anonymous
 pages of all memory cgroups except ``/having_care_already``.::
@@ -385,8 +388,14 @@ pages of all memory cgroups except ``/having_care_already``.::
     echo /having_care_already > 1/memcg_path
     echo N > 1/matching
 
-Note that filters are currently supported only when ``paddr``
-`implementation <sysfs_contexts>` is being used.
+Note that ``anon`` and ``memcg`` filters are currently supported only when
+``paddr`` `implementation <sysfs_contexts>` is being used.
+
+Also, memory regions that are filtered out by ``addr`` filters are not counted
+as the scheme has tried to those, while regions that filtered out by other type
+filters are counted as the scheme has tried to.  The difference is applied to
+:ref:`stats <damos_stats>` and :ref:`tried regions
+<sysfs_schemes_tried_regions>`.
 
 .. _sysfs_schemes_stats:
 
-- 
2.25.1