From c5e67d40a10234541e220750297304df79aaedd0 Mon Sep 17 00:00:00 2001 From: Yunjeong Mun Date: Fri, 27 Jun 2025 09:33:29 -0700 Subject: [PATCH] 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 Signed-off-by: SeongJae Park Suggested-by: Honggyu Kim Reviewed-by: SeongJae Park Signed-off-by: Andrew Morton --- samples/damon/mtier.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/samples/damon/mtier.c b/samples/damon/mtier.c index c94254b77fc98..97892ade7f313 100644 --- a/samples/damon/mtier.c +++ b/samples/damon/mtier.c @@ -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; -- 2.47.2