+ mm-oom_kill-proc-replace-magic-number-1000-with-oom_score_adj_max.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/oom_kill, proc: replace magic number 1000 with OOM_SCORE_ADJ_MAX
has been added to the -mm mm-new branch.  Its filename is
     mm-oom_kill-proc-replace-magic-number-1000-with-oom_score_adj_max.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-oom_kill-proc-replace-magic-number-1000-with-oom_score_adj_max.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: Ye Liu <liuye@kylinos.cn>
Subject: mm/oom_kill, proc: replace magic number 1000 with OOM_SCORE_ADJ_MAX
Date: Tue, 11 Aug 2026 11:36:08 +0800

In oom_badness() and proc_oom_score(), the oom_score_adj normalization
uses a hardcoded 1000, which is the value of OOM_SCORE_ADJ_MAX defined in
include/uapi/linux/oom.h.  Other code in the kernel (e.g.  fs/proc/base.c
oom_adj handling) already uses OOM_SCORE_ADJ_MAX for the same purpose.

Replace the magic number with the macro for consistency and readability. 
No functional change.

Link: https://lore.kernel.org/20260811033609.3992348-1-ye.liu@linux.dev
Signed-off-by: Ye Liu <liuye@kylinos.cn>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Liu Ye <liuye@kylinos.cn>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Song Hu <husong@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/proc/base.c |    3 ++-
 mm/oom_kill.c  |    2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

--- a/fs/proc/base.c~mm-oom_kill-proc-replace-magic-number-1000-with-oom_score_adj_max
+++ a/fs/proc/base.c
@@ -594,7 +594,8 @@ static int proc_oom_score(struct seq_fil
 	 * exporting for a long time so userspace might depend on it.
 	 */
 	if (badness != LONG_MIN)
-		points = (1000 + badness * 1000 / (long)totalpages) * 2 / 3;
+		points = (OOM_SCORE_ADJ_MAX +
+			  badness * OOM_SCORE_ADJ_MAX / (long)totalpages) * 2 / 3;
 
 	seq_printf(m, "%lu\n", points);
 
--- a/mm/oom_kill.c~mm-oom_kill-proc-replace-magic-number-1000-with-oom_score_adj_max
+++ a/mm/oom_kill.c
@@ -230,7 +230,7 @@ long oom_badness(struct task_struct *p,
 	task_unlock(p);
 
 	/* Normalize to oom_score_adj units */
-	adj *= totalpages / 1000;
+	adj *= totalpages / OOM_SCORE_ADJ_MAX;
 	points += adj;
 
 	return points;
_

Patches currently in -mm which might be from liuye@kylinos.cn are

mm-vmalloc-fix-vmap_purge_lock-livelock-under-memory-pressure.patch
tools-mm-page_owner_sort-fix-sort-option-being-silently-ignored.patch
tools-mm-page_owner_sort-add-module-name-sort-cull-filter-support.patch
tools-mm-page_owner_sort-show-available-sort-keys-in-usage-text.patch
mm-oom_kill-remove-unreachable-__gfp_thisnode-check-in-constrained_alloc.patch
mm-oom_kill-proc-replace-magic-number-1000-with-oom_score_adj_max.patch