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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: 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>
pull/1311/head
Yunjeong Mun 2025-06-27 09:33:29 -07:00 committed by Andrew Morton
parent d1554fb630
commit c5e67d40a1
1 changed files with 7 additions and 1 deletions
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8
samples/damon/mtier.c
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@ -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;