mm/damon/core: split out scheme quota adjustment logic into a new function

DAMOS quota adjustment logic in 'kdamond_apply_schemes()', has some amount
of code, and the logic is not so straightforward.  Split it out to a new
function for better readability.

Link: https://lkml.kernel.org/r/20221026225943.100429-5-sj@kernel.orgSigned-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

mm/damon/core.c

@@ -848,27 +848,20 @@ static void damos_set_effective_quota(struct damos_quota *quota)
 	quota->esz = esz;
 }
 
-static void kdamond_apply_schemes(struct damon_ctx *c)
+static void damos_adjust_quota(struct damon_ctx *c, struct damos *s)
 {
-	struct damon_target *t;
-	struct damon_region *r, *next_r;
-	struct damos *s;
-
-	damon_for_each_scheme(s, c) {
 	struct damos_quota *quota = &s->quota;
+	struct damon_target *t;
+	struct damon_region *r;
 	unsigned long cumulated_sz;
 	unsigned int score, max_score = 0;
 
-		if (!s->wmarks.activated)
-			continue;
-
 	if (!quota->ms && !quota->sz)
-			continue;
+		return;
 
 	/* New charge window starts */
 	if (time_after_eq(jiffies, quota->charged_from +
-					msecs_to_jiffies(
-						quota->reset_interval))) {
+				msecs_to_jiffies(quota->reset_interval))) {
 		if (quota->esz && quota->charged_sz >= quota->esz)
 			s->stat.qt_exceeds++;
 		quota->total_charged_sz += quota->charged_sz;
@@ -878,7 +871,7 @@ static void kdamond_apply_schemes(struct damon_ctx *c)
 	}
 
 	if (!c->ops.get_scheme_score)
-			continue;
+		return;
 
 	/* Fill up the score histogram */
 	memset(quota->histogram, 0, sizeof(quota->histogram));
@@ -886,8 +879,7 @@ static void kdamond_apply_schemes(struct damon_ctx *c)
 		damon_for_each_region(r, t) {
 			if (!__damos_valid_target(r, s))
 				continue;
-				score = c->ops.get_scheme_score(
-						c, t, r, s);
+			score = c->ops.get_scheme_score(c, t, r, s);
 			quota->histogram[score] += damon_sz_region(r);
 			if (score > max_score)
 				max_score = score;
@@ -901,6 +893,19 @@ static void kdamond_apply_schemes(struct damon_ctx *c)
 			break;
 	}
 	quota->min_score = score;
+}
+
+static void kdamond_apply_schemes(struct damon_ctx *c)
+{
+	struct damon_target *t;
+	struct damon_region *r, *next_r;
+	struct damos *s;
+
+	damon_for_each_scheme(s, c) {
+		if (!s->wmarks.activated)
+			continue;
+
+		damos_adjust_quota(c, s);
 	}
 
 	damon_for_each_target(t, c) {