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Docs/mm/damon/design: rewrite configurable layers

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The 'Configurable Operations Set' section is a little bit outdated. 
Update the text.

Link: https://lkml.kernel.org/r/20230525214314.5204-6-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park
2023-05-25 21:43:09 +00:00
committed by Andrew Morton
parent e168962dbf
commit 69e7b88cea
1 changed files with 13 additions and 14 deletions
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27
Documentation/mm/damon/design.rst
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@@ -22,24 +22,23 @@ DAMON subsystem is configured with three layers including
Configurable Operations Set
---------------------------
DAMON provides data access monitoring functionality while making the accuracy
and the overhead controllable. The fundamental access monitorings require
primitives that dependent on and optimized for the target address space. On
the other hand, the accuracy and overhead tradeoff mechanism, which is the core
of DAMON, is in the pure logic space. DAMON separates the two parts in
different layers and defines its interface to allow various low level
primitives implementations configurable with the core logic. We call the low
level primitives implementations monitoring operations.
For data access monitoring and additional low level work, DAMON needs a set of
implementations for specific operations that are dependent on and optimized for
the given target address space. On the other hand, the accuracy and overhead
tradeoff mechanism, which is the core logic of DAMON, is in the pure logic
space. DAMON separates the two parts in different layers, namely DAMON
Operations Set and DAMON Core Logics Layers, respectively. It further defines
the interface between the layers to allow various operations sets to be
configured with the core logic.
Due to this separated design and the configurable interface, users can extend
DAMON for any address space by configuring the core logics with appropriate
monitoring operations. If appropriate one is not provided, users can implement
the operations on their own.
Due to this design, users can extend DAMON for any address space by configuring
the core logic to use the appropriate operations set. If any appropriate set
is unavailable, users can implement one on their own.
For example, physical memory, virtual memory, swap space, those for specific
processes, NUMA nodes, files, and backing memory devices would be supportable.
Also, if some architectures or devices support special optimized access check
primitives, those will be easily configurable.
Also, if some architectures or devices supporting special optimized access
check primitives, those will be easily configurable.
Operations Set Layer