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mm/damon/sysfs-schemes: implement probe/hits file

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Implement sysfs file for showing the per-region per-probe hits count.

Link: https://lore.kernel.org/20260518234119.97569-18-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: "Masami Hiramatsu (Google)" <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2026-05-18 16:41:05 -07:00 committed by Andrew Morton
parent a1536db4dc
commit 5b0de1bc33
1 changed files with 34 additions and 7 deletions
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41
mm/damon/sysfs-schemes.c
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@ -16,11 +16,27 @@
struct damos_sysfs_probe { struct damos_sysfs_probe {
struct kobject kobj; struct kobject kobj;
unsigned char hits;
}; };
static struct damos_sysfs_probe *damos_sysfs_probe_alloc(void) static struct damos_sysfs_probe *damos_sysfs_probe_alloc(unsigned char hits)
{ {
return kzalloc_obj(struct damos_sysfs_probe); struct damos_sysfs_probe *probe;
probe = kzalloc_obj(*probe);
if (!probe)
return NULL;
probe->hits = hits;
return probe;
}
static ssize_t hits_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct damos_sysfs_probe *probe = container_of(kobj,
struct damos_sysfs_probe, kobj);
return sysfs_emit(buf, "%hhu\n", probe->hits);
} }
static void damos_sysfs_probe_release(struct kobject *kobj) static void damos_sysfs_probe_release(struct kobject *kobj)
@ -31,9 +47,19 @@ static void damos_sysfs_probe_release(struct kobject *kobj)
kfree(probe); kfree(probe);
} }
static struct kobj_attribute damos_sysfs_probe_hits_attr =
__ATTR_RO_MODE(hits, 0400);
static struct attribute *damos_sysfs_probe_attrs[] = {
&damos_sysfs_probe_hits_attr.attr,
NULL,
};
ATTRIBUTE_GROUPS(damos_sysfs_probe);
static const struct kobj_type damos_sysfs_probe_ktype = { static const struct kobj_type damos_sysfs_probe_ktype = {
.release = damos_sysfs_probe_release, .release = damos_sysfs_probe_release,
.sysfs_ops = &kobj_sysfs_ops, .sysfs_ops = &kobj_sysfs_ops,
.default_groups = damos_sysfs_probe_groups,
}; };
/* /*
@ -64,7 +90,7 @@ static void damos_sysfs_probes_rm_dirs(struct damos_sysfs_probes *probes)
} }
static int damos_sysfs_probes_add_dirs(struct damos_sysfs_probes *probes, static int damos_sysfs_probes_add_dirs(struct damos_sysfs_probes *probes,
struct damon_ctx *ctx) struct damon_ctx *ctx, struct damon_region *region)
{ {
struct damon_probe *probe; struct damon_probe *probe;
struct damos_sysfs_probe **probes_arr; struct damos_sysfs_probe **probes_arr;
@ -86,7 +112,7 @@ static int damos_sysfs_probes_add_dirs(struct damos_sysfs_probes *probes,
struct damos_sysfs_probe *sys_probe; struct damos_sysfs_probe *sys_probe;
int err; int err;
sys_probe = damos_sysfs_probe_alloc(); sys_probe = damos_sysfs_probe_alloc(region->probe_hits[i]);
if (!sys_probe) { if (!sys_probe) {
damos_sysfs_probes_rm_dirs(probes); damos_sysfs_probes_rm_dirs(probes);
return -ENOMEM; return -ENOMEM;
@ -150,7 +176,8 @@ static struct damon_sysfs_scheme_region *damon_sysfs_scheme_region_alloc(
static int damos_sysfs_region_add_dirs( static int damos_sysfs_region_add_dirs(
struct damon_sysfs_scheme_region *region, struct damon_sysfs_scheme_region *region,
struct damon_ctx *ctx) struct damon_ctx *ctx,
struct damon_region *dregion)
{ {
struct damos_sysfs_probes *probes = damos_sysfs_probes_alloc(); struct damos_sysfs_probes *probes = damos_sysfs_probes_alloc();
int err; int err;
@ -161,7 +188,7 @@ static int damos_sysfs_region_add_dirs(
&region->kobj, "probes"); &region->kobj, "probes");
if (err) if (err)
goto fail; goto fail;
err = damos_sysfs_probes_add_dirs(probes, ctx); err = damos_sysfs_probes_add_dirs(probes, ctx, dregion);
if (err) if (err)
goto fail; goto fail;
@ -3140,7 +3167,7 @@ void damos_sysfs_populate_region_dir(struct damon_sysfs_schemes *sysfs_schemes,
&sysfs_regions->kobj, "%d", &sysfs_regions->kobj, "%d",
sysfs_regions->nr_regions)) sysfs_regions->nr_regions))
goto out; goto out;
if (damos_sysfs_region_add_dirs(region, ctx)) if (damos_sysfs_region_add_dirs(region, ctx, r))
goto out; goto out;
list_add_tail(&region->list, &sysfs_regions->regions_list); list_add_tail(&region->list, &sysfs_regions->regions_list);