1 files changed, 62 insertions, 0 deletions

diff --git a/mm/damon/core.c b/mm/damon/core.c
index eb9580942a5c..bcd2bd9d6c10 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -878,6 +878,66 @@ static void damos_update_stat(struct damos *s,
 	s->stat.sz_applied += sz_applied;
 }
 
+static bool __damos_filter_out(struct damon_ctx *ctx, struct damon_target *t,
+		struct damon_region *r, struct damos_filter *filter)
+{
+	bool matched = false;
+	struct damon_target *ti;
+	int target_idx = 0;
+	unsigned long start, end;
+
+	switch (filter->type) {
+	case DAMOS_FILTER_TYPE_TARGET:
+		damon_for_each_target(ti, ctx) {
+			if (ti == t)
+				break;
+			target_idx++;
+		}
+		matched = target_idx == filter->target_idx;
+		break;
+	case DAMOS_FILTER_TYPE_ADDR:
+		start = ALIGN_DOWN(filter->addr_range.start, DAMON_MIN_REGION);
+		end = ALIGN_DOWN(filter->addr_range.end, DAMON_MIN_REGION);
+
+		/* inside the range */
+		if (start <= r->ar.start && r->ar.end <= end) {
+			matched = true;
+			break;
+		}
+		/* outside of the range */
+		if (r->ar.end <= start || end <= r->ar.start) {
+			matched = false;
+			break;
+		}
+		/* start before the range and overlap */
+		if (r->ar.start < start) {
+			damon_split_region_at(t, r, start - r->ar.start);
+			matched = false;
+			break;
+		}
+		/* start inside the range */
+		damon_split_region_at(t, r, end - r->ar.start);
+		matched = true;
+		break;
+	default:
+		break;
+	}
+
+	return matched == filter->matching;
+}
+
+static bool damos_filter_out(struct damon_ctx *ctx, struct damon_target *t,
+		struct damon_region *r, struct damos *s)
+{
+	struct damos_filter *filter;
+
+	damos_for_each_filter(filter, s) {
+		if (__damos_filter_out(ctx, t, r, filter))
+			return true;
+	}
+	return false;
+}
+
 static void damos_apply_scheme(struct damon_ctx *c, struct damon_target *t,
 		struct damon_region *r, struct damos *s)
 {
@@ -895,6 +955,8 @@ static void damos_apply_scheme(struct damon_ctx *c, struct damon_target *t,
 				goto update_stat;
 			damon_split_region_at(t, r, sz);
 		}
+		if (damos_filter_out(c, t, r, s))
+			return;
 		ktime_get_coarse_ts64(&begin);
 		if (c->callback.before_damos_apply)
 			err = c->callback.before_damos_apply(c, t, r, s);