+ docs-vm-damon-design-update-damon-idle-page-tracking-interference-handling.patch added to -mm tree

+ docs-vm-damon-design-update-damon-idle-page-tracking-interference-handling.patch added to -mm tree

[Andrew Morton]

The patch titled
     Subject: Docs/vm/damon/design: update DAMON-Idle Page Tracking interference handling
has been added to the -mm tree.  Its filename is
     docs-vm-damon-design-update-damon-idle-page-tracking-interference-handling.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/docs-vm-damon-design-update-damon-idle-page-tracking-interference-handling.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/docs-vm-damon-design-update-damon-idle-page-tracking-interference-handling.patch

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------------------------------------------------------
From: SeongJae Park <sj@kernel.org>
Subject: Docs/vm/damon/design: update DAMON-Idle Page Tracking interference handling

In DAMON's early development stage before it be merged in the mainline, it
was first designed to work exclusively with Idle page tracking to avoid
any interference between each other.  Later, but still before be merged in
the mainline, because Idle page tracking is fully under the control of
sysadmins, we made the resolving of conflict as the responsibility of
sysadmins.  The document is not updated for the change, though.  This
commit updates the document for that.

Link: https://lkml.kernel.org/r/20220222170100.17068-3-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>
---

 Documentation/vm/damon/design.rst |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/Documentation/vm/damon/design.rst~docs-vm-damon-design-update-damon-idle-page-tracking-interference-handling
+++ a/Documentation/vm/damon/design.rst
@@ -84,9 +84,10 @@ table having a mapping to the address.
 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
_

Patches currently in -mm which might be from sj@kernel.org are

mm-damon-dbgfs-init_regions-use-target-index-instead-of-target-id.patch
docs-admin-guide-mm-damon-usage-update-for-changed-initail_regions-file-input.patch
mm-damon-core-move-damon_set_targets-into-dbgfs.patch
mm-damon-remove-the-target-id-concept.patch
mm-damon-rename-damon_primitives-to-damon_operations.patch
mm-damon-let-monitoring-operations-can-be-registered-and-selected.patch
mm-damon-paddrvaddr-register-themselves-to-damon-in-subsys_initcall.patch
mm-damon-reclaim-use-damon_select_ops-instead-of-damon_vpa_set_operations.patch
mm-damon-dbgfs-use-damon_select_ops-instead-of-damon_vpa_set_operations.patch
mm-damon-dbgfs-use-operations-id-for-knowing-if-the-target-has-pid.patch
mm-damon-dbgfs-test-fix-is_target_id-change.patch
mm-damon-paddrvaddr-remove-damon_pva_target_validset_operations.patch
docs-vm-damon-call-low-level-monitoring-primitives-the-operations.patch
docs-vm-damon-design-update-damon-idle-page-tracking-interference-handling.patch
docs-damon-update-outdated-term-regions-update-interval.patch