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samples/damon: support automatic node address detection

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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: Yunjeong Mun <yunjeong.mun@sk.com>
Suggested-by: Honggyu Kim <honggyu.kim@sk.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Yunjeong Mun
2025-07-08 08:59:18 +09:00
committed by Andrew Morton
parent 793020545c
commit 749cc6533b
1 changed files with 34 additions and 3 deletions
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37
samples/damon/mtier.c
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@@ -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);