Commit ea1f204b authored by Usama Arif's avatar Usama Arif Committed by Andrew Morton
Browse files

mm/damon/sysfs-schemes: add files for setting damos_filter->sz_range 

Add min and max files for damon filters to let the userspace decide the
min/max folio size to operate on.  This will be needed to decide what
folio sizes to give pa_stat for.

Link: https://lkml.kernel.org/r/20250211124437.278873-3-usamaarif642@gmail.com


Signed-off-by: default avatarUsama Arif <usamaarif642@gmail.com>
Reviewed-by: default avatarSeongJae Park <sj@kernel.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 0431c426

mm/damon/sysfs-schemes.c

+54 −0
Original line number Diff line number Diff line
@@ -316,6 +316,7 @@ struct damon_sysfs_scheme_filter { 
	bool allow;

	char *memcg_path;

	struct damon_addr_range addr_range;

	struct damon_size_range sz_range;

	int target_idx;

};
@@ -474,6 +475,44 @@ static ssize_t addr_end_store(struct kobject *kobj, 
	return err ? err : count;

}



static ssize_t min_show(struct kobject *kobj,

		struct kobj_attribute *attr, char *buf)

{

	struct damon_sysfs_scheme_filter *filter = container_of(kobj,

			struct damon_sysfs_scheme_filter, kobj);



	return sysfs_emit(buf, "%lu\n", filter->sz_range.min);

}



static ssize_t min_store(struct kobject *kobj,

		struct kobj_attribute *attr, const char *buf, size_t count)

{

	struct damon_sysfs_scheme_filter *filter = container_of(kobj,

			struct damon_sysfs_scheme_filter, kobj);

	int err = kstrtoul(buf, 0, &filter->sz_range.min);



	return err ? err : count;

}



static ssize_t max_show(struct kobject *kobj,

		struct kobj_attribute *attr, char *buf)

{

	struct damon_sysfs_scheme_filter *filter = container_of(kobj,

			struct damon_sysfs_scheme_filter, kobj);



	return sysfs_emit(buf, "%lu\n", filter->sz_range.max);

}



static ssize_t max_store(struct kobject *kobj,

		struct kobj_attribute *attr, const char *buf, size_t count)

{

	struct damon_sysfs_scheme_filter *filter = container_of(kobj,

			struct damon_sysfs_scheme_filter, kobj);

	int err = kstrtoul(buf, 0, &filter->sz_range.max);



	return err ? err : count;

}



static ssize_t damon_target_idx_show(struct kobject *kobj,

		struct kobj_attribute *attr, char *buf)

{
@@ -520,6 +559,12 @@ static struct kobj_attribute damon_sysfs_scheme_filter_addr_start_attr = 
static struct kobj_attribute damon_sysfs_scheme_filter_addr_end_attr =

		__ATTR_RW_MODE(addr_end, 0600);



static struct kobj_attribute damon_sysfs_scheme_filter_min_attr =

		__ATTR_RW_MODE(min, 0600);



static struct kobj_attribute damon_sysfs_scheme_filter_max_attr =

		__ATTR_RW_MODE(max, 0600);



static struct kobj_attribute damon_sysfs_scheme_filter_damon_target_idx_attr =

		__ATTR_RW_MODE(damon_target_idx, 0600);
@@ -530,6 +575,8 @@ static struct attribute *damon_sysfs_scheme_filter_attrs[] = { 
	&damon_sysfs_scheme_filter_memcg_path_attr.attr,

	&damon_sysfs_scheme_filter_addr_start_attr.attr,

	&damon_sysfs_scheme_filter_addr_end_attr.attr,

	&damon_sysfs_scheme_filter_min_attr.attr,

	&damon_sysfs_scheme_filter_max_attr.attr,

	&damon_sysfs_scheme_filter_damon_target_idx_attr.attr,

	NULL,

};
@@ -1954,6 +2001,13 @@ static int damon_sysfs_add_scheme_filters(struct damos *scheme, 
			filter->addr_range = sysfs_filter->addr_range;

		} else if (filter->type == DAMOS_FILTER_TYPE_TARGET) {

			filter->target_idx = sysfs_filter->target_idx;

		} else if (filter->type == DAMOS_FILTER_TYPE_HUGEPAGE_SIZE) {

			if (sysfs_filter->sz_range.min >

					sysfs_filter->sz_range.max) {

				damos_destroy_filter(filter);

				return -EINVAL;

			}

			filter->sz_range = sysfs_filter->sz_range;

		}



		damos_add_filter(scheme, filter);