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| author | SeongJae Park <sj@kernel.org> | 2026-05-18 16:40:58 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2026-05-28 21:31:12 -0700 |
| commit | b445dd587d793d4b1dbd8046d0587a3acaba4a41 (patch) | |
| tree | 2d7d6e67a61b51f6ec257695b9c5bb10421c13ff /mm | |
| parent | e1e056c689a5fe9e011631637d5850822c546da2 (diff) | |
| download | linux-next-history-b445dd587d793d4b1dbd8046d0587a3acaba4a41.tar.gz | |
mm/damon/sysfs: implement probe dir
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>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/damon/sysfs.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c index ccd19fc062f31..6cef3eaa4431e 100644 --- a/mm/damon/sysfs.c +++ b/mm/damon/sysfs.c @@ -748,11 +748,42 @@ static const struct kobj_type damon_sysfs_intervals_ktype = { }; /* + * 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); } |