[RFC PATCH v3 5/8] mm/damon/sysfs: support hugepage_size probe filter

[SJ Park <sj@kernel.org>]

Extend DAMON sysfs interface to support hugepage_size probe filter.
Allows hugepage_size user string input to the filter type file.  Pass
the size range argument that users set via min/max files under the probe
filter directory to the DAMON core.

Signed-off-by: SJ Park <sj@kernel.org>
---
 mm/damon/sysfs.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mm/damon/sysfs.c b/mm/damon/sysfs.c
index 8e8d89b8ed981..43519afb9eb7f 100644
--- a/mm/damon/sysfs.c
+++ b/mm/damon/sysfs.c
@@ -1007,6 +1007,10 @@ damon_sysfs_filter_type_names[] = {
 		.type = DAMON_FILTER_TYPE_PGIDLE_SET,
 		.name = "pgidle_set",
 	},
+	{
+		.type = DAMON_FILTER_TYPE_HUGEPAGE_SIZE,
+		.name = "hugepage_size",
+	},
 };
 
 static ssize_t type_show(struct kobject *kobj,
@@ -2273,6 +2277,9 @@ static int damon_sysfs_set_filters(struct damon_probe *probe,
 				damon_destroy_filter(filter);
 				return err;
 			}
+		} else if (filter->type == DAMON_FILTER_TYPE_HUGEPAGE_SIZE) {
+			filter->range_min = sys_filter->range_min;
+			filter->range_max = sys_filter->range_max;
 		}
 		damon_add_filter(probe, filter);
 	}
-- 
2.47.3