+ docs-mm-damon-design-clarify-when-qt_exceeds-increases.patch added to mm-new branch

+ docs-mm-damon-design-clarify-when-qt_exceeds-increases.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: Docs/mm/damon/design: clarify when qt_exceeds increases
has been added to the -mm mm-new branch.  Its filename is
     docs-mm-damon-design-clarify-when-qt_exceeds-increases.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/docs-mm-damon-design-clarify-when-qt_exceeds-increases.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: Liew Rui Yan <aethernet65535@gmail.com>
Subject: Docs/mm/damon/design: clarify when qt_exceeds increases
Date: Mon, 14 Sep 2026 07:19:50 -0700

qt_exceeds counts how many times a scheme's quota has been exceeded.

When using the temporal auto-tuning algorithm, the effective size quota
becomes zero once the goal is [over-]achieved.  In this case, the quotas
are still set, so qt_exceeds keeps increasing once per quota reset
interval while the goal stays achieved.

Clarify this behavior in the design document.

Link: https://lore.kernel.org/20260914141952.91465-6-sj@kernel.org
Signed-off-by: Liew Rui Yan <aethernet65535@gmail.com>
Reviewed-by: SJ Park <sj@kernel.org>
Signed-off-by: SJ Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Brendan Higgins <brendan.higgins@linux.dev>
Cc: David Gow <davidgow@davidgow.net>
Cc: David Hildenbrand <david@kernel.org>
Cc: Eva Kurchatova <eva.kurchatova@virtuozzo.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kunwu Chan <kunwu.chan@gmail.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lian Wang <lianux.mm@gmail.com>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: "Zenghui Yu (Huawei)" <zenghui.yu@linux.dev>
---

 Documentation/mm/damon/design.rst |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/Documentation/mm/damon/design.rst~docs-mm-damon-design-clarify-when-qt_exceeds-increases
+++ a/Documentation/mm/damon/design.rst
@@ -696,7 +696,9 @@ There are two such tuning algorithms tha
   fast as possible, using maximum allowed quota, but only for a temporal short
   time.  When the quota is under-achieved, this algorithm keeps tuning quota to
   a maximum allowed one.  Once the quota is [over]-achieved, this sets the
-  quota zero.  Useful for deterministic control required environments.
+  quota zero.  Useful for deterministic control required environments.  Note
+  that the zero quota is a valid quota, and therefore ``qt_exceeds`` :ref:`stat
+  <damon_design_damos_stat>` will keep increasing in this case.
 
 The goal can be specified with five parameters, namely ``target_metric``,
 ``target_value``, ``current_value``, ``nid`` and ``path``.  The auto-tuning
_

Patches currently in -mm which might be from aethernet65535@gmail.com are

mm-damon-core-allow-esz-to-be-set-to-zero.patch
mm-damon-core-fix-unconditionally-skip-last-region.patch
docs-mm-damon-design-accurate-semantics-of-nr_snapshots.patch
docs-mm-damon-design-difference-between-watermarks-and-nr_snapshots.patch
docs-mm-damon-design-fix-typo-of-max_nr_snapshots.patch
docs-mm-damon-design-clarify-when-qt_exceeds-increases.patch
docs-mm-damon-design-fix-typos-in-temporal-auto-tuning-algorithm-section.patch