Docs/mm/damon/index: mention DAMOS on the intro

What DAMON aims to do is not only access monitoring but efficient and
effective access-aware system operations.  And DAMon-based Operation
Schemes (DAMOS) is the important feature of DAMON for the goal.  Make the
intro of DAMON documentation to emphasize the goal and mention DAMOS.

Link: https://lkml.kernel.org/r/20230110190400.119388-4-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Documentation/mm/damon/index.rst

@@ -4,8 +4,9 @@
 DAMON: Data Access MONitor
 ==========================
 
-DAMON is a data access monitoring framework subsystem for the Linux kernel.
-The core mechanisms of DAMON (refer to :doc:`design` for the detail) make it
+DAMON is a Linux kernel subsystem that provides a framework for data access
+monitoring and the monitoring results based system operations.  The core
+monitoring mechanisms of DAMON (refer to :doc:`design` for the detail) make it
 
  - *accurate* (the monitoring output is useful enough for DRAM level memory
    management; It might not appropriate for CPU Cache levels, though),
@@ -14,12 +15,16 @@ The core mechanisms of DAMON (refer to :doc:`design` for the detail) make it
  - *scalable* (the upper-bound of the overhead is in constant range regardless
    of the size of target workloads).
 
-Using this framework, therefore, the kernel's memory management mechanisms can
-make advanced decisions.  Experimental memory management optimization works
-that incurring high data accesses monitoring overhead could implemented again.
-In user space, meanwhile, users who have some special workloads can write
-personalized applications for better understanding and optimizations of their
-workloads and systems.
+Using this framework, therefore, the kernel can operate system in an
+access-aware fashion.  Because the features are also exposed to the user space,
+users who have special information about their workloads can write personalized
+applications for better understanding and optimizations of their workloads and
+systems.
+
+For easier development of such systems, DAMON provides a feature called DAMOS
+(DAMon-based Operation Schemes) in addition to the monitoring.  Using the
+feature, DAMON users in both kernel and user spaces can do access-aware system
+operations with no code but simple configurations.
 
 .. toctree::
    :maxdepth: 2