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mm/damon/sysfs: add a file for listing available monitoring ops

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DAMON programming interface users can know if specific monitoring ops set
is registered or not using 'damon_is_registered_ops()', but there is no
such method for the user space.  To help the case, this commit adds a new
DAMON sysfs file called 'avail_operations' under each context directory
for listing available monitoring ops.  Reading the file will list each
registered monitoring ops on each line.

Link: https://lkml.kernel.org/r/20220426203843.45238-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park
2022-05-09 18:20:51 -07:00
committed by Andrew Morton
parent 152e56178a
commit 0f2cb58857
1 changed files with 19 additions and 0 deletions
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19
mm/damon/sysfs.c
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@@ -1810,6 +1810,21 @@ static void damon_sysfs_context_rm_dirs(struct damon_sysfs_context *context)
kobject_put(&context->schemes->kobj);
}
static ssize_t avail_operations_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
enum damon_ops_id id;
int len = 0;
for (id = 0; id < NR_DAMON_OPS; id++) {
if (!damon_is_registered_ops(id))
continue;
len += sysfs_emit_at(buf, len, "%s\n",
damon_sysfs_ops_strs[id]);
}
return len;
}
static ssize_t operations_show(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
@@ -1840,10 +1855,14 @@ static void damon_sysfs_context_release(struct kobject *kobj)
kfree(container_of(kobj, struct damon_sysfs_context, kobj));
}
static struct kobj_attribute damon_sysfs_context_avail_operations_attr =
__ATTR_RO_MODE(avail_operations, 0400);
static struct kobj_attribute damon_sysfs_context_operations_attr =
__ATTR_RW_MODE(operations, 0600);
static struct attribute *damon_sysfs_context_attrs[] = {
&damon_sysfs_context_avail_operations_attr.attr,
&damon_sysfs_context_operations_attr.attr,
NULL,
};