diff options
| author | SeongJae Park <sj@kernel.org> | 2026-05-18 16:41:00 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-05-28 21:31:13 -0700 |
| commit | 5d8e2ac19ff80aceb776a0bf9f93202e3e797e9d (patch) | |
| tree | 241ef649492e2e743c6e0919087417cf7bc8fbbb /mm | |
| parent | 92c4bb97de78d41a614005efd7c53369ca7be160 (diff) | |
| download | linux-next-history-5d8e2ac19ff80aceb776a0bf9f93202e3e797e9d.tar.gz | |
mm/damon/sysfs: implement filter dir
Implement a sysfs directory for letting the users to configure each data
probe filter.
Link: https://lore.kernel.org/20260518234119.97569-13-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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/damon/sysfs.c | 125 |
1 files changed, 124 insertions, 1 deletions
diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index dad4985a826db..2dc475ea0f0f7 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -748,11 +748,45 @@ static const struct kobj_type damon_sysfs_intervals_ktype = { }; /* + * filter directory + */ + +struct damon_sysfs_filter { + struct kobject kobj; +}; + +static struct damon_sysfs_filter *damon_sysfs_filter_alloc(void) +{ + return kzalloc_obj(struct damon_sysfs_filter); +} + +static void damon_sysfs_filter_release(struct kobject *kobj) +{ + struct damon_sysfs_filter *filter = container_of(kobj, + struct damon_sysfs_filter, kobj); + + kfree(filter); +} + +static struct attribute *damon_sysfs_filter_attrs[] = { + NULL, +}; +ATTRIBUTE_GROUPS(damon_sysfs_filter); + +static const struct kobj_type damon_sysfs_filter_ktype = { + .release = damon_sysfs_filter_release, + .sysfs_ops = &kobj_sysfs_ops, + .default_groups = damon_sysfs_filter_groups, +}; + +/* * filters directory */ struct damon_sysfs_filters { struct kobject kobj; + struct damon_sysfs_filter **filters_arr; + int nr; }; static struct damon_sysfs_filters *damon_sysfs_filters_alloc(void) @@ -760,12 +794,98 @@ static struct damon_sysfs_filters *damon_sysfs_filters_alloc(void) return kzalloc_obj(struct damon_sysfs_filters); } +static void damon_sysfs_filters_rm_dirs(struct damon_sysfs_filters *filters) +{ + struct damon_sysfs_filter **filters_arr = filters->filters_arr; + int i; + + for (i = 0; i < filters->nr; i++) + kobject_put(&filters_arr[i]->kobj); + filters->nr = 0; + kfree(filters_arr); + filters->filters_arr = NULL; +} + +static int damon_sysfs_filters_add_dirs( + struct damon_sysfs_filters *filters, int nr_filters) +{ + struct damon_sysfs_filter **filters_arr, *filter; + int err, i; + + damon_sysfs_filters_rm_dirs(filters); + if (!nr_filters) + return 0; + + filters_arr = kmalloc_objs(*filters_arr, nr_filters, + GFP_KERNEL | __GFP_NOWARN); + if (!filters_arr) + return -ENOMEM; + filters->filters_arr = filters_arr; + + for (i = 0; i < nr_filters; i++) { + filter = damon_sysfs_filter_alloc(); + if (!filter) { + damon_sysfs_filters_rm_dirs(filters); + return -ENOMEM; + } + + err = kobject_init_and_add(&filter->kobj, + &damon_sysfs_filter_ktype, &filters->kobj, + "%d", i); + if (err) { + kobject_put(&filter->kobj); + damon_sysfs_filters_rm_dirs(filters); + return err; + } + + filters_arr[i] = filter; + filters->nr++; + } + return 0; +} + +static ssize_t nr_filters_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buf) +{ + struct damon_sysfs_filters *filters = container_of(kobj, + struct damon_sysfs_filters, kobj); + + return sysfs_emit(buf, "%d\n", filters->nr); +} + +static ssize_t nr_filters_store(struct kobject *kobj, + struct kobj_attribute *attr, const char *buf, size_t count) +{ + struct damon_sysfs_filters *filters; + int nr, err = kstrtoint(buf, 0, &nr); + + if (err) + return err; + if (nr < 0) + return -EINVAL; + + filters = container_of(kobj, struct damon_sysfs_filters, kobj); + + if (!mutex_trylock(&damon_sysfs_lock)) + return -EBUSY; + err = damon_sysfs_filters_add_dirs(filters, nr); + mutex_unlock(&damon_sysfs_lock); + if (err) + return err; + + return count; +} + static void damon_sysfs_filters_release(struct kobject *kobj) { kfree(container_of(kobj, struct damon_sysfs_filters, kobj)); } +static struct kobj_attribute damon_sysfs_filters_nr_attr = + __ATTR_RW_MODE(nr_filters, 0600); + static struct attribute *damon_sysfs_filters_attrs[] = { + &damon_sysfs_filters_nr_attr.attr, NULL, }; ATTRIBUTE_GROUPS(damon_sysfs_filters); @@ -811,7 +931,10 @@ static int damon_sysfs_probe_add_dirs(struct damon_sysfs_probe *attr) static void damon_sysfs_probe_rm_dirs(struct damon_sysfs_probe *attr) { - kobject_put(&attr->filters->kobj); + if (attr->filters) { + damon_sysfs_filters_rm_dirs(attr->filters); + kobject_put(&attr->filters->kobj); + } } static void damon_sysfs_probe_release(struct kobject *kobj) |