+ samples-damon-mtier-add-parameters-for-node0-memory-usage.patch added to mm-new branch

+ samples-damon-mtier-add-parameters-for-node0-memory-usage.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: samples/damon/mtier: add parameters for node0 memory usage
has been added to the -mm mm-new branch.  Its filename is
     samples-damon-mtier-add-parameters-for-node0-memory-usage.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/samples-damon-mtier-add-parameters-for-node0-memory-usage.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
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------------------------------------------------------
From: Yunjeong Mun <yunjeong.mun@sk.com>
Subject: samples/damon/mtier: add parameters for node0 memory usage
Date: Fri, 27 Jun 2025 09:33:29 -0700

Change the hard-coded quota goal metric values into sysfs knobs:
`node0_mem_used_bp` and `node0_mem_free_bp`.  These knobs represent the
used and free memory ratio of node0 in basis points (bp, where 1 bp =
0.01%).  As mentioned in [1], this patch is developed under the assumption
that node0 is always the fast-tier in a two-tiers memory setup.

[1] https://lore.kernel.org/linux-mm/20250420194030.75838-8-sj@kernel.org/

Link: https://lkml.kernel.org/r/20250627163329.50997-1-sj@kernel.org
Link: https://patch.msgid.link/20250619050313.1535-1-yunjeong.mun@sk.com
Signed-off-by: Yunjeong Mun <yunjeong.mun@sk.com>
Signed-off-by: SeongJae Park <sj@kernel.org>
Suggested-by: Honggyu Kim <honggyu.kim@sk.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 samples/damon/mtier.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/samples/damon/mtier.c~samples-damon-mtier-add-parameters-for-node0-memory-usage
+++ a/samples/damon/mtier.c
@@ -24,6 +24,12 @@ module_param(node1_start_addr, ulong, 06
 static unsigned long node1_end_addr __read_mostly;
 module_param(node1_end_addr, ulong, 0600);
 
+static unsigned long node0_mem_used_bp __read_mostly = 9970;
+module_param(node0_mem_used_bp, ulong, 0600);
+
+static unsigned long node0_mem_free_bp __read_mostly = 50;
+module_param(node0_mem_free_bp, ulong, 0600);
+
 static int damon_sample_mtier_enable_store(
 		const char *val, const struct kernel_param *kp);
 
@@ -112,7 +118,7 @@ static struct damon_ctx *damon_sample_mt
 	quota_goal = damos_new_quota_goal(
 			promote ? DAMOS_QUOTA_NODE_MEM_USED_BP :
 			DAMOS_QUOTA_NODE_MEM_FREE_BP,
-			promote ? 9970 : 50);
+			promote ? node0_mem_used_bp : node0_mem_free_bp);
 	if (!quota_goal)
 		goto free_out;
 	quota_goal->nid = 0;
_

Patches currently in -mm which might be from yunjeong.mun@sk.com are

samples-damon-mtier-add-parameters-for-node0-memory-usage.patch