Commit 749cc653 authored by Yunjeong Mun's avatar Yunjeong Mun Committed by Andrew Morton
Browse files

samples/damon: support automatic node address detection 

This patch adds a new knob `detect_node_addresses`, which determines
whether the physical address range is set manually using the existing
knobs or automatically by the mtier module.  When `detect_node_addresses`
set to 'Y', mtier automatically converts node0 and node1 to their physical
addresses.  If set to 'N', it uses the existing 'node#_start_addr' and
'node#_end_addr' to define regions as before.

Link: https://lkml.kernel.org/r/20250707235919.513-1-yunjeong.mun@sk.com


Signed-off-by: default avatarYunjeong Mun <yunjeong.mun@sk.com>
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 79302054

samples/damon/mtier.c

+34 −3
Original line number Diff line number Diff line
@@ -47,8 +47,29 @@ static bool enabled __read_mostly; 
module_param_cb(enabled, &enabled_param_ops, &enabled, 0600);

MODULE_PARM_DESC(enabled, "Enable or disable DAMON_SAMPLE_MTIER");



static bool detect_node_addresses __read_mostly;

module_param(detect_node_addresses, bool, 0600);



static struct damon_ctx *ctxs[2];



struct region_range {

	phys_addr_t start;

	phys_addr_t end;

};



static int nid_to_phys(int target_node, struct region_range *range)

{

	if (!node_online(target_node)) {

		pr_err("NUMA node %d is not online\n", target_node);

		return -EINVAL;

	}



	range->start = PFN_PHYS(node_start_pfn(target_node));

	range->end  = PFN_PHYS(node_end_pfn(target_node));



	return 0;

}



static struct damon_ctx *damon_sample_mtier_build_ctx(bool promote)

{

	struct damon_ctx *ctx;
@@ -58,6 +79,8 @@ static struct damon_ctx *damon_sample_mtier_build_ctx(bool promote) 
	struct damos *scheme;

	struct damos_quota_goal *quota_goal;

	struct damos_filter *filter;

	struct region_range addr;

	int ret;



	ctx = damon_new_ctx();

	if (!ctx)
@@ -87,9 +110,17 @@ static struct damon_ctx *damon_sample_mtier_build_ctx(bool promote) 
	if (!target)

		goto free_out;

	damon_add_target(ctx, target);

	region = damon_new_region(

			promote ? node1_start_addr : node0_start_addr,

			promote ? node1_end_addr : node0_end_addr);



	if (detect_node_addresses) {

		ret = promote ? nid_to_phys(1, &addr) : nid_to_phys(0, &addr);

		if (ret)

			goto free_out;

	} else {

		addr.start = promote ? node1_start_addr : node0_start_addr;

		addr.end = promote ? node1_end_addr : node0_end_addr;

	}



	region = damon_new_region(addr.start, addr.end);

	if (!region)

		goto free_out;

	damon_add_region(region, target);