Merge branch 'akpm' (patches from Andrew)

Merge updates from Andrew Morton:

 - A few misc subsystems: kthread, scripts, ntfs, ocfs2, block, and vfs

 - Most the MM patches which precede the patches in Willy's tree: kasan,
   pagecache, gup, swap, shmem, memcg, selftests, pagemap, mremap,
   sparsemem, vmalloc, pagealloc, memory-failure, mlock, hugetlb,
   userfaultfd, vmscan, compaction, mempolicy, oom-kill, migration, thp,
   cma, autonuma, psi, ksm, page-poison, madvise, memory-hotplug, rmap,
   zswap, uaccess, ioremap, highmem, cleanups, kfence, hmm, and damon.

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (227 commits)
  mm/damon/sysfs: remove repeat container_of() in damon_sysfs_kdamond_release()
  Docs/ABI/testing: add DAMON sysfs interface ABI document
  Docs/admin-guide/mm/damon/usage: document DAMON sysfs interface
  selftests/damon: add a test for DAMON sysfs interface
  mm/damon/sysfs: support DAMOS stats
  mm/damon/sysfs: support DAMOS watermarks
  mm/damon/sysfs: support schemes prioritization
  mm/damon/sysfs: support DAMOS quotas
  mm/damon/sysfs: support DAMON-based Operation Schemes
  mm/damon/sysfs: support the physical address space monitoring
  mm/damon/sysfs: link DAMON for virtual address spaces monitoring
  mm/damon: implement a minimal stub for sysfs-based DAMON interface
  mm/damon/core: add number of each enum type values
  mm/damon/core: allow non-exclusive DAMON start/stop
  Docs/damon: update outdated term 'regions update interval'
  Docs/vm/damon/design: update DAMON-Idle Page Tracking interference handling
  Docs/vm/damon: call low level monitoring primitives the operations
  mm/damon: remove unnecessary CONFIG_DAMON option
  mm/damon/paddr,vaddr: remove damon_{p,v}a_{target_valid,set_operations}()
  mm/damon/dbgfs-test: fix is_target_id() change
  ...

2 files changed, 24 insertions, 21 deletions

diff --git a/Documentation/vm/damon/design.rst b/Documentation/vm/damon/design.rst
index 210f0f50efd8..0cff6fac6b7e 100644
--- a/Documentation/vm/damon/design.rst
+++ b/Documentation/vm/damon/design.rst
@@ -13,12 +13,13 @@ 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.
+primitives implementations configurable with the core logic.  We call the low
+level primitives implementations monitoring operations.
 
 Due to this separated design and the configurable interface, users can extend
-DAMON for any address space by configuring the core logics with appropriate low
-level primitive implementations.  If appropriate one is not provided, users can
-implement the primitives on their own.
+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.
 
 For example, physical memory, virtual memory, swap space, those for specific
 processes, NUMA nodes, files, and backing memory devices would be supportable.
@@ -26,25 +27,24 @@ Also, if some architectures or devices support special optimized access check
 primitives, those will be easily configurable.
 
 
-Reference Implementations of Address Space Specific Primitives
-==============================================================
+Reference Implementations of Address Space Specific Monitoring Operations
+=========================================================================
 
-The low level primitives for the fundamental access monitoring are defined in
-two parts:
+The monitoring operations are defined in two parts:
 
 1. Identification of the monitoring target address range for the address space.
 2. Access check of specific address range in the target space.
 
-DAMON currently provides the implementations of the primitives for the physical
+DAMON currently provides the implementations of the operations for the physical
 and virtual address spaces. Below two subsections describe how those work.
 
 
 VMA-based Target Address Range Construction
 -------------------------------------------
 
-This is only for the virtual address space primitives implementation.  That for
-the physical address space simply asks users to manually set the monitoring
-target address ranges.
+This is only for the virtual address space monitoring operations
+implementation.  That for the physical address space simply asks users to
+manually set the monitoring target address ranges.
 
 Only small parts in the super-huge virtual address space of the processes are
 mapped to the physical memory and accessed.  Thus, tracking the unmapped
@@ -84,9 +84,10 @@ table having a mapping to the address.  In this way, the implementations find
 and clear the bit(s) for next sampling target address and checks whether the
 bit(s) set again after one sampling period.  This could disturb other kernel
 subsystems using the Accessed bits, namely Idle page tracking and the reclaim
-logic.  To avoid such disturbances, DAMON makes it mutually exclusive with Idle
-page tracking and uses ``PG_idle`` and ``PG_young`` page flags to solve the
-conflict with the reclaim logic, as Idle page tracking does.
+logic.  DAMON does nothing to avoid disturbing Idle page tracking, so handling
+the interference is the responsibility of sysadmins.  However, it solves the
+conflict with the reclaim logic using ``PG_idle`` and ``PG_young`` page flags,
+as Idle page tracking does.
 
 
 Address Space Independent Core Mechanisms
@@ -94,8 +95,8 @@ Address Space Independent Core Mechanisms
 
 Below four sections describe each of the DAMON core mechanisms and the five
 monitoring attributes, ``sampling interval``, ``aggregation interval``,
-``regions update interval``, ``minimum number of regions``, and ``maximum
-number of regions``.
+``update interval``, ``minimum number of regions``, and ``maximum number of
+regions``.
 
 
 Access Frequency Monitoring
@@ -168,6 +169,8 @@ The monitoring target address range could dynamically changed.  For example,
 virtual memory could be dynamically mapped and unmapped.  Physical memory could
 be hot-plugged.
 
-As the changes could be quite frequent in some cases, DAMON checks the dynamic
-memory mapping changes and applies it to the abstracted target area only for
-each of a user-specified time interval (``regions update interval``).
+As the changes could be quite frequent in some cases, DAMON allows the
+monitoring operations to check dynamic changes including memory mapping changes
+and applies it to monitoring operations-related data structures such as the
+abstracted monitoring target memory area only for each of a user-specified time
+interval (``update interval``).
diff --git a/Documentation/vm/damon/faq.rst b/Documentation/vm/damon/faq.rst
index 11aea40eb328..dde7e2414ee6 100644
--- a/Documentation/vm/damon/faq.rst
+++ b/Documentation/vm/damon/faq.rst
@@ -31,7 +31,7 @@ Does DAMON support virtual memory only?
 =======================================
 
 No.  The core of the DAMON is address space independent.  The address space
-specific low level primitive parts including monitoring target regions
+specific monitoring operations including monitoring target regions
 constructions and actual access checks can be implemented and configured on the
 DAMON core by the users.  In this way, DAMON users can monitor any address
 space with any access check technique.