From 375af850385c787fc7115bf304c48b475818e5e4 Mon Sep 17 00:00:00 2001 From: SeongJae Park Date: Wed, 2 Aug 2023 21:43:06 +0000 Subject: [PATCH] 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. Link: https://lkml.kernel.org/r/20230802214312.110532-8-sj@kernel.org Signed-off-by: SeongJae Park Cc: Brendan Higgins Cc: Jonathan Corbet Cc: Shuah Khan Signed-off-by: Andrew Morton --- 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 1859dd6..a9cb994 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 ` is being used. +Note that ``anon`` and ``memcg`` filters are currently supported only when +``paddr`` `implementation ` 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 ` and :ref:`tried regions +`. .. _sysfs_schemes_stats: -- 2.7.4