+ mm-vmpressure-remove-window-size-todo.patch added to mm-new branch

+ mm-vmpressure-remove-window-size-todo.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/vmpressure: remove window size TODO
has been added to the -mm mm-new branch.  Its filename is
     mm-vmpressure-remove-window-size-todo.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-vmpressure-remove-window-size-todo.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: "Lorenzo Stoakes (ARM)" <ljs@kernel.org>
Subject: mm/vmpressure: remove window size TODO
Date: Mon, 31 Aug 2026 14:42:11 +0100

There has been a steady stream of patches that have been submitted by
newcomers to core mm 'fixing' this TODO, with all but the original having
very likely been generated by LLMs.

It appears that TODOs to LLMs are like red rags to a bull.

In addition, TODOs in code often bitrot and are distracting - those who
understand the code know what could be improved in future.

Therefore remove the TODO.

The work required to actually fix this TODO requires somebody who both has
understanding of the code and significant real-world data to back their
changes.

Such a person doesn't require a TODO prompt to implement this change, so
nothing of value is being lost here.

Link: https://lore.kernel.org/all/20260831130316.448-1-tahasezer.is@gmail.com/
Link: https://lore.kernel.org/linux-mm/20260724054305.516126-1-cui.tao@linux.dev/
Link: https://lore.kernel.org/linux-mm/20260715143646.15828-1-gaikwad.dcg@gmail.com/
Link: https://lore.kernel.org/all/20260227221555.29969-1-mcq@disroot.org/
Link: https://lore.kernel.org/20260831-remove-vmpressure-todo-v1-1-498515e59cdf@kernel.org
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/vmpressure.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/mm/vmpressure.c~mm-vmpressure-remove-window-size-todo
+++ a/mm/vmpressure.c
@@ -30,9 +30,6 @@
  *
  * As the vmscan reclaimer logic works with chunks which are multiple of
  * SWAP_CLUSTER_MAX, it makes sense to use it for the window size as well.
- *
- * TODO: Make the window size depend on machine size, as we do for vmstat
- * thresholds. Currently we set it to 512 pages (2MB for 4KB pages).
  */
 const unsigned long vmpressure_win = SWAP_CLUSTER_MAX * 16;
 
_

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

mm-mremap-reset-unfaulted-vma-page-offset-for-mremap_dontunmap.patch
mm-secretmem-properly-account-locked-pages.patch
mm-huge_memory-bypass-thp-tuneables-for-huge-pfnmap-mappings.patch
mm-mremap-account-mm-locked_vm-correctly-for-mremap_dontunmap.patch
mm-vmpressure-remove-window-size-todo.patch