Commit c5e67d40 authored by Yunjeong Mun's avatar Yunjeong Mun Committed by Andrew Morton
Browse files

samples/damon/mtier: add parameters for node0 memory usage 

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: default avatarYunjeong Mun <yunjeong.mun@sk.com>
Signed-off-by: default avatarSeongJae Park <sj@kernel.org>
Suggested-by: default avatarHonggyu Kim <honggyu.kim@sk.com>
Reviewed-by: default avatarSeongJae Park <sj@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent d1554fb6

samples/damon/mtier.c

+7 −1
Original line number Diff line number Diff line
@@ -24,6 +24,12 @@ module_param(node1_start_addr, ulong, 0600); 
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_mtier_build_ctx(bool promote) 
	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;