+ mm-damon-remove-__read_mostly-from-memory_idle_ms_percentiles.patch added to mm-new branch

+ mm-damon-remove-__read_mostly-from-memory_idle_ms_percentiles.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/damon/stat: remove __read_mostly from memory_idle_ms_percentiles
has been added to the -mm mm-new branch.  Its filename is
     mm-damon-remove-__read_mostly-from-memory_idle_ms_percentiles.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-damon-remove-__read_mostly-from-memory_idle_ms_percentiles.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.

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------------------------------------------------------
From: Li RongQing <lirongqing@baidu.com>
Subject: mm/damon/stat: remove __read_mostly from memory_idle_ms_percentiles
Date: Fri, 30 Jan 2026 03:56:03 -0500

The 'memory_idle_ms_percentiles' array in DAMON_STAT is updated frequently
by the kernel to reflect the latest idle time statistics.  Marking it as
'__read_mostly' is inappropriate for data that is regularly written to, as
it can lead to cache pollution in the read-mostly section.

Remove the '__read_mostly' annotation to accurately reflect the
variable's usage pattern.

Link: https://lkml.kernel.org/r/20260130085603.1814-1-lirongqing@baidu.com
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/damon/stat.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/damon/stat.c~mm-damon-remove-__read_mostly-from-memory_idle_ms_percentiles
+++ a/mm/damon/stat.c
@@ -34,7 +34,7 @@ module_param(estimated_memory_bandwidth,
 MODULE_PARM_DESC(estimated_memory_bandwidth,
 		"Estimated memory bandwidth usage in bytes per second");
 
-static long memory_idle_ms_percentiles[101] __read_mostly = {0,};
+static long memory_idle_ms_percentiles[101] = {0,};
 module_param_array(memory_idle_ms_percentiles, long, NULL, 0400);
 MODULE_PARM_DESC(memory_idle_ms_percentiles,
 		"Memory idle time percentiles in milliseconds");
_

Patches currently in -mm which might be from lirongqing@baidu.com are

mm-damon-remove-__read_mostly-from-memory_idle_ms_percentiles.patch