linux-kernel - [PATCH 08/10] Docs/mm/damon/design: use a list for supported filters

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Message-Id: <20240503180318.72798-9-sj@kernel.org>
Date: Fri,  3 May 2024 11:03:16 -0700
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 08/10] Docs/mm/damon/design: use a list for supported filters

Filters section is listing currently supported filter types in a normal
paragraph.  Since the number of types are higher than four, it is not
easy to read for only specific types.  Use a list for easier finding of
specific types.

Signed-off-by: SeongJae Park <sj@...nel.org>
---
 Documentation/mm/damon/design.rst | 46 +++++++++++++++++--------------
 1 file changed, 26 insertions(+), 20 deletions(-)

diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst
index f2baf617184d..1873755358af 100644
--- a/Documentation/mm/damon/design.rst
+++ b/Documentation/mm/damon/design.rst
@@ -461,26 +461,32 @@ number of filters for each scheme.  Each filter specifies the type of target
 memory, and whether it should exclude the memory of the type (filter-out), or
 all except the memory of the type (filter-in).
 
-Currently, anonymous page, memory cgroup, young page, address range, and DAMON
-monitoring target type filters are supported by the feature.  Some filter
-target types require additional arguments.  The memory cgroup filter type asks
-users to specify the file path of the memory cgroup for the filter.  The
-address range type asks the start and end addresses of the range.  The DAMON
-monitoring target type asks the index of the target from the context's
-monitoring targets list.  Hence, users can apply specific schemes to only
-anonymous pages, non-anonymous pages, pages of specific cgroups, all pages
-excluding those of specific cgroups, pages that not accessed after the last
-access check from the scheme, pages that accessed after the last access check
-from the scheme, pages in specific address range, pages in specific DAMON
-monitoring targets, and any combination of those.
-
-To handle filters efficiently, the address range and DAMON monitoring target
-type filters are handled by the core layer, while others are handled by
-operations set.  If a memory region is filtered by a core layer-handled filter,
-it is not counted as the scheme has tried to the region.  In contrast, if a
-memory regions is filtered by an operations set layer-handled filter, it is
-counted as the scheme has tried.  The difference in accounting leads to changes
-in the statistics.
+For efficient handling of filters, some types of filters are handled by the
+core layer, while others are handled by operations set.  In the latter case,
+hence, support of the filter types depends on the DAMON operations set.  In
+case of the core layer-handled filters, the memory regions that excluded by the
+filter are not counted as the scheme has tried to the region.  In contrast, if
+a memory regions is filtered by an operations set layer-handled filter, it is
+counted as the scheme has tried.  This difference affects the statistics.
+
+Below types of filters are currently supported.
+
+- anonymous page
+  - Applied to pages that containing data that not stored in files.
+  - Handled by operations set layer.  Supported by only ``paddr`` set.
+- memory cgroup
+  - Applied to pages that belonging to a given cgroup.
+  - Handled by operations set layer.  Supported by only ``paddr`` set.
+- young page
+  - Applied to pages that are accessed after the last access check from the
+    scheme.
+  - Handled by operations set layer.  Supported by only ``paddr`` set.
+- address range
+  - Applied to pages that belonging to a given address range.
+  - Handled by the core logic.
+- DAMON monitoring target
+  - Applied to pages that belonging to a given DAMON monitoring target.
+  - Handled by the core logic.
 
 
 Application Programming Interface
-- 
2.39.2