From 83d0d46a80340baa9bf7e6039f3ad5d097c1af77 Mon Sep 17 00:00:00 2001
From: Honggyu Kim <honggyu.kim@sk.com>
Date: Fri, 14 Jun 2024 12:00:09 +0900
Subject: [PATCH] Docs/damon: document damos_migrate_{hot,cold}
This patch adds damon description for "migrate_hot" and "migrate_cold"
actions for both usage and design documents as long as a new
"target_nid" knob to set the migration target node.
[sj@kernel.org: trivial fixups for DAMOS_MIGRATE_{HOT,COLD} documentation]
Link: https://lkml.kernel.org/r/20240618213630.84846-2-sj@kernel.org
Link: https://lkml.kernel.org/r/20240614030010.751-8-honggyu.kim@sk.com
Signed-off-by: Honggyu Kim <honggyu.kim@sk.com>
Signed-off-by: SeongJae Park <sj@kernel.org>Reviewed-by: SeongJae Park <sj@kernel.org>
Cc: Gregory Price <gregory.price@memverge.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Hyeongtak Ji <hyeongtak.ji@sk.com>
Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Rakie Kim <rakie.kim@sk.com>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
Documentation/admin-guide/mm/damon/usage.rst | 10 +++++++---
Documentation/mm/damon/design.rst | 4 ++++
2 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/Documentation/admin-guide/mm/damon/usage.rst b/Documentation/admin-guide/mm/damon/usage.rst
index e58ceb89ea2a7..26df6cfa44411 100644
--- a/Documentation/admin-guide/mm/damon/usage.rst
+++ b/Documentation/admin-guide/mm/damon/usage.rst
@@ -78,7 +78,7 @@ comma (",").
│ │ │ │ │ │ │ │ ...
│ │ │ │ │ │ ...
│ │ │ │ │ :ref:`schemes <sysfs_schemes>`/nr_schemes
- │ │ │ │ │ │ :ref:`0 <sysfs_scheme>`/action,apply_interval_us
+ │ │ │ │ │ │ :ref:`0 <sysfs_scheme>`/action,target_nid,apply_interval_us
│ │ │ │ │ │ │ :ref:`access_pattern <sysfs_access_pattern>`/
│ │ │ │ │ │ │ │ sz/min,max
│ │ │ │ │ │ │ │ nr_accesses/min,max
@@ -289,14 +289,18 @@ schemes/<N>/
------------
In each scheme directory, five directories (``access_pattern``, ``quotas``,
-``watermarks``, ``filters``, ``stats``, and ``tried_regions``) and two files
-(``action`` and ``apply_interval``) exist.
+``watermarks``, ``filters``, ``stats``, and ``tried_regions``) and three files
+(``action``, ``target_nid`` and ``apply_interval``) exist.
The ``action`` file is for setting and getting the scheme's :ref:`action
<damon_design_damos_action>`. The keywords that can be written to and read
from the file and their meaning are same to those of the list on
:ref:`design doc <damon_design_damos_action>`.
+The ``target_nid`` file is for setting the migration target node, which is
+only meaningful when the ``action`` is either ``migrate_hot`` or
+``migrate_cold``.
+
The ``apply_interval_us`` file is for setting and getting the scheme's
:ref:`apply_interval <damon_design_damos>` in microseconds.
diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst
index 3df387249937b..3f12c884eb3a0 100644
--- a/Documentation/mm/damon/design.rst
+++ b/Documentation/mm/damon/design.rst
@@ -325,6 +325,10 @@ that supports each action are as below.
Supported by ``paddr`` operations set.
- ``lru_deprio``: Deprioritize the region on its LRU lists.
Supported by ``paddr`` operations set.
+ - ``migrate_hot``: Migrate the regions prioritizing warmer regions.
+ Supported by ``paddr`` operations set.
+ - ``migrate_cold``: Migrate the regions prioritizing colder regions.
+ Supported by ``paddr`` operations set.
- ``stat``: Do nothing but count the statistics.
Supported by all operations sets.
--
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