From 67c34f6c6af8f3bdf794a6b91d9f063faeac0575 Mon Sep 17 00:00:00 2001 From: SeongJae Park Date: Fri, 16 Jun 2023 19:17:41 +0000 Subject: [PATCH] Docs/admin-guide/mm/damon/usage: clarify quotas and watermarks sysfs interface Explanation of DAMOS quotas and watermarks are not clearly explaining the meaning and expectation of each file. Add more clarification for those. Link: https://lkml.kernel.org/r/20230616191742.87531-7-sj@kernel.org Signed-off-by: SeongJae Park Cc: Jonathan Corbet Signed-off-by: Andrew Morton --- Documentation/admin-guide/mm/damon/usage.rst | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst index ea6a5dc8930e..9d3ebd70772f 100644 --- a/Documentation/admin-guide/mm/damon/usage.rst +++ b/Documentation/admin-guide/mm/damon/usage.rst @@ -306,7 +306,8 @@ Under the ``access_pattern`` directory, three directories (``sz``, ``nr_accesses``, and ``age``) each having two files (``min`` and ``max``) exist. You can set and get the access pattern for the given scheme by writing to and reading from the ``min`` and ``max`` files under ``sz``, -``nr_accesses``, and ``age`` directories, respectively. +``nr_accesses``, and ``age`` directories, respectively. Note that the ``min`` +and the ``max`` form a closed interval. schemes//quotas/ ------------------- @@ -320,7 +321,13 @@ Under ``quotas`` directory, three files (``ms``, ``bytes``, You can set the ``time quota`` in milliseconds, ``size quota`` in bytes, and ``reset interval`` in milliseconds by writing the values to the three files, -respectively. You can also set the :ref:`prioritization weights +respectively. Then, DAMON tries to use only up to ``time quota`` milliseconds +for applying the ``action`` to memory regions of the ``access_pattern``, and to +apply the action to only up to ``bytes`` bytes of memory regions within the +``reset_interval_ms``. Setting both ``ms`` and ``bytes`` zero disables the +quota limits. + +You can also set the :ref:`prioritization weights ` for size, access frequency, and age in per-thousand unit by writing the values to the three files under the ``weights`` directory.