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

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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/[email protected]/

Link: https://lkml.kernel.org/r/[email protected]
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Yunjeong Mun <[email protected]>
Signed-off-by: SeongJae Park <[email protected]>
Suggested-by: Honggyu Kim <[email protected]>
Reviewed-by: SeongJae Park <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
This commit is contained in:
Yunjeong Mun authored and Andrew Morton committed 2025-07-13 16:38:19 -07:00
1 parent d1554fb630
commit c5e67d40a1
1 file changed
+7 -1
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samples/damon/mtier.c
+7 -1
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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;