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mm/damon/sysfs: implement filters directory

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Implement a directory for letting users to install data probe filters.

Link: https://lore.kernel.org/20260518234119.97569-12-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 16:40:59 -07:00 committed by Andrew Morton
parent 7d49f5aaee
commit af7cb41af9
1 changed files with 64 additions and 1 deletions
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65
mm/damon/sysfs.c
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@ -747,12 +747,42 @@ static const struct kobj_type damon_sysfs_intervals_ktype = {
.default_groups = damon_sysfs_intervals_groups,
};
/*
* filters directory
*/
struct damon_sysfs_filters {
struct kobject kobj;
};
static struct damon_sysfs_filters *damon_sysfs_filters_alloc(void)
{
return kzalloc_obj(struct damon_sysfs_filters);
}
static void damon_sysfs_filters_release(struct kobject *kobj)
{
kfree(container_of(kobj, struct damon_sysfs_filters, kobj));
}
static struct attribute *damon_sysfs_filters_attrs[] = {
NULL,
};
ATTRIBUTE_GROUPS(damon_sysfs_filters);
static const struct kobj_type damon_sysfs_filters_ktype = {
.release = damon_sysfs_filters_release,
.sysfs_ops = &kobj_sysfs_ops,
.default_groups = damon_sysfs_filters_groups,
};
/*
* probe directory
*/
struct damon_sysfs_probe {
struct kobject kobj;
struct damon_sysfs_filters *filters;
};
static struct damon_sysfs_probe *damon_sysfs_probe_alloc(void)
@ -760,6 +790,30 @@ static struct damon_sysfs_probe *damon_sysfs_probe_alloc(void)
return kzalloc_obj(struct damon_sysfs_probe);
}
static int damon_sysfs_probe_add_dirs(struct damon_sysfs_probe *attr)
{
struct damon_sysfs_filters *filters;
int err;
filters = damon_sysfs_filters_alloc();
if (!filters)
return -ENOMEM;
attr->filters = filters;
err = kobject_init_and_add(&filters->kobj, &damon_sysfs_filters_ktype,
&attr->kobj, "filters");
if (err) {
kobject_put(&filters->kobj);
attr->filters = NULL;
}
return err;
}
static void damon_sysfs_probe_rm_dirs(struct damon_sysfs_probe *attr)
{
kobject_put(&attr->filters->kobj);
}
static void damon_sysfs_probe_release(struct kobject *kobj)
{
kfree(container_of(kobj, struct damon_sysfs_probe, kobj));
@ -797,8 +851,10 @@ static void damon_sysfs_probes_rm_dirs(
struct damon_sysfs_probe **probes_arr = probes->probes_arr;
int i;
for (i = 0; i < probes->nr; i++)
for (i = 0; i < probes->nr; i++) {
damon_sysfs_probe_rm_dirs(probes_arr[i]);
kobject_put(&probes_arr[i]->kobj);
}
probes->nr = 0;
kfree(probes_arr);
probes->probes_arr = NULL;
@ -836,6 +892,13 @@ static int damon_sysfs_probes_add_dirs(
return err;
}
err = damon_sysfs_probe_add_dirs(probe);
if (err) {
kobject_put(&probe->kobj);
damon_sysfs_probes_rm_dirs(probes);
return err;
}
probes_arr[i] = probe;
probes->nr++;
}