Commit 0f2cb588 authored by SeongJae Park's avatar SeongJae Park Committed by Andrew Morton
Browse files

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

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: default avatarSeongJae Park <sj@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 152e5617

mm/damon/sysfs.c

+19 −0
Original line number Diff line number Diff line
@@ -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,

};