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docs-mm-damon-design-clarify-when-qt_exceeds-increases.patch removed from -mm tree

merged mm-stable Andrew Morton 1 participant 1 message Oct 13

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The quilt patch titled
Subject: Docs/mm/damon/design: clarify when qt_exceeds increases
has been removed from the -mm tree. Its filename was
docs-mm-damon-design-clarify-when-qt_exceeds-increases.patch

This patch was dropped because it was merged into the mm-stable branch of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Liew Rui Yan <[email protected]>
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.

Cc Brendan Higgins <[email protected]>
Cc David Gow <[email protected]>
Cc David Hildenbrand <[email protected]>
Cc Eva Kurchatova <[email protected]>
Cc Jonathan Corbet <[email protected]>
Cc Kunwu Chan <[email protected]>
Cc Liam R. Howlett <[email protected]>
Cc Lian Wang <[email protected]>
Cc Lorenzo Stoakes <[email protected]>
Cc Michal Hocko <[email protected]>
Cc Mike Rapoport <[email protected]>
Cc Randy Dunlap <[email protected]>
Cc Shuah Khan <[email protected]>
Cc Suren Baghdasaryan <[email protected]>
Cc Vlastimil Babka <[email protected]>
Cc "Zenghui Yu (Huawei)" <[email protected]>

---

 Documentation/mm/damon/design.rst |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
Documentation/mm/damon/design.rst renamed from Documentation/mm/damon/design.rst~docs-mm-damon-design-clarify-when-qt_exceeds-increases +3 -1
@@ -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 [email protected] are

mm-damon-tests-core-kunit-add-test-for-unconditionally-skipping-the-last-region.patch