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mm/damon/sysfs: implement probe dir

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Implement sysfs directory for letting users install each data probe.

Link: https://lore.kernel.org/20260518234119.97569-11-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 16:40:58 -07:00 committed by Andrew Morton
parent 90a8322934
commit 7d49f5aaee
1 changed files with 119 additions and 0 deletions
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119
mm/damon/sysfs.c
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@ -747,12 +747,43 @@ static const struct kobj_type damon_sysfs_intervals_ktype = {
.default_groups = damon_sysfs_intervals_groups,
};
/*
* probe directory
*/
struct damon_sysfs_probe {
struct kobject kobj;
};
static struct damon_sysfs_probe *damon_sysfs_probe_alloc(void)
{
return kzalloc_obj(struct damon_sysfs_probe);
}
static void damon_sysfs_probe_release(struct kobject *kobj)
{
kfree(container_of(kobj, struct damon_sysfs_probe, kobj));
}
static struct attribute *damon_sysfs_probe_attrs[] = {
NULL,
};
ATTRIBUTE_GROUPS(damon_sysfs_probe);
static const struct kobj_type damon_sysfs_probe_ktype = {
.release = damon_sysfs_probe_release,
.sysfs_ops = &kobj_sysfs_ops,
.default_groups = damon_sysfs_probe_groups,
};
/*
* probes directory
*/
struct damon_sysfs_probes {
struct kobject kobj;
struct damon_sysfs_probe **probes_arr;
int nr;
};
static struct damon_sysfs_probes *damon_sysfs_probes_alloc(void)
@ -760,12 +791,99 @@ static struct damon_sysfs_probes *damon_sysfs_probes_alloc(void)
return kzalloc_obj(struct damon_sysfs_probes);
}
static void damon_sysfs_probes_rm_dirs(
struct damon_sysfs_probes *probes)
{
struct damon_sysfs_probe **probes_arr = probes->probes_arr;
int i;
for (i = 0; i < probes->nr; i++)
kobject_put(&probes_arr[i]->kobj);
probes->nr = 0;
kfree(probes_arr);
probes->probes_arr = NULL;
}
static int damon_sysfs_probes_add_dirs(
struct damon_sysfs_probes *probes, int nr_probes)
{
struct damon_sysfs_probe **probes_arr, *probe;
int err, i;
damon_sysfs_probes_rm_dirs(probes);
if (!nr_probes)
return 0;
probes_arr = kmalloc_objs(*probes_arr, nr_probes,
GFP_KERNEL | __GFP_NOWARN);
if (!probes_arr)
return -ENOMEM;
probes->probes_arr = probes_arr;
for (i = 0; i < nr_probes; i++) {
probe = damon_sysfs_probe_alloc();
if (!probe) {
damon_sysfs_probes_rm_dirs(probes);
return -ENOMEM;
}
err = kobject_init_and_add(&probe->kobj,
&damon_sysfs_probe_ktype, &probes->kobj,
"%d", i);
if (err) {
kobject_put(&probe->kobj);
damon_sysfs_probes_rm_dirs(probes);
return err;
}
probes_arr[i] = probe;
probes->nr++;
}
return 0;
}
static ssize_t nr_probes_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct damon_sysfs_probes *probes = container_of(kobj,
struct damon_sysfs_probes, kobj);
return sysfs_emit(buf, "%d\n", probes->nr);
}
static ssize_t nr_probes_store(struct kobject *kobj,
struct kobj_attribute *attr, const char *buf, size_t count)
{
struct damon_sysfs_probes *probes;
int nr, err = kstrtoint(buf, 0, &nr);
if (err)
return err;
if (nr < 0 || nr > DAMON_MAX_PROBES)
return -EINVAL;
probes = container_of(kobj, struct damon_sysfs_probes, kobj);
if (!mutex_trylock(&damon_sysfs_lock))
return -EBUSY;
err = damon_sysfs_probes_add_dirs(probes, nr);
mutex_unlock(&damon_sysfs_lock);
if (err)
return err;
return count;
}
static void damon_sysfs_probes_release(struct kobject *kobj)
{
kfree(container_of(kobj, struct damon_sysfs_probes, kobj));
}
static struct kobj_attribute damon_sysfs_probes_nr_probes =
__ATTR_RW_MODE(nr_probes, 0600);
static struct attribute *damon_sysfs_probes_attrs[] = {
&damon_sysfs_probes_nr_probes.attr,
NULL,
};
ATTRIBUTE_GROUPS(damon_sysfs_probes);
@ -862,6 +980,7 @@ static void damon_sysfs_attrs_rm_dirs(struct damon_sysfs_attrs *attrs)
kobject_put(&attrs->nr_regions_range->kobj);
damon_sysfs_intervals_rm_dirs(attrs->intervals);
kobject_put(&attrs->intervals->kobj);
damon_sysfs_probes_rm_dirs(attrs->probes);
kobject_put(&attrs->probes->kobj);
}