[patch 250/262] mm/damon/dbgfs: support watermarks

[Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>]

From: SeongJae Park <sj@xxxxxxxxxx>
Subject: mm/damon/dbgfs: support watermarks

This commit updates DAMON debugfs interface to support the watermarks
based schemes activation.  For this, now 'schemes' file receives five more
values.

Link: https://lkml.kernel.org/r/20211019150731.16699-13-sj@xxxxxxxxxx
Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Cc: Amit Shah <amit@xxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: David Woodhouse <dwmw@xxxxxxxxxx>
Cc: Greg Thelen <gthelen@xxxxxxxxxx>
Cc: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Leonard Foerster <foersleo@xxxxxxxxx>
Cc: Marco Elver <elver@xxxxxxxxxx>
Cc: Markus Boehme <markubo@xxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/damon/dbgfs.c |   16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

--- a/mm/damon/dbgfs.c~mm-damon-dbgfs-support-watermarks
+++ a/mm/damon/dbgfs.c
@@ -105,7 +105,7 @@ static ssize_t sprint_schemes(struct dam
 
 	damon_for_each_scheme(s, c) {
 		rc = scnprintf(&buf[written], len - written,
-				"%lu %lu %u %u %u %u %d %lu %lu %lu %u %u %u %lu %lu\n",
+				"%lu %lu %u %u %u %u %d %lu %lu %lu %u %u %u %d %lu %lu %lu %lu %lu %lu\n",
 				s->min_sz_region, s->max_sz_region,
 				s->min_nr_accesses, s->max_nr_accesses,
 				s->min_age_region, s->max_age_region,
@@ -115,6 +115,8 @@ static ssize_t sprint_schemes(struct dam
 				s->quota.weight_sz,
 				s->quota.weight_nr_accesses,
 				s->quota.weight_age,
+				s->wmarks.metric, s->wmarks.interval,
+				s->wmarks.high, s->wmarks.mid, s->wmarks.low,
 				s->stat_count, s->stat_sz);
 		if (!rc)
 			return -ENOMEM;
@@ -195,18 +197,18 @@ static struct damos **str_to_schemes(con
 	*nr_schemes = 0;
 	while (pos < len && *nr_schemes < max_nr_schemes) {
 		struct damos_quota quota = {};
-		struct damos_watermarks wmarks = {
-			.metric = DAMOS_WMARK_NONE,
-		};
+		struct damos_watermarks wmarks;
 
 		ret = sscanf(&str[pos],
-				"%lu %lu %u %u %u %u %u %lu %lu %lu %u %u %u%n",
+				"%lu %lu %u %u %u %u %u %lu %lu %lu %u %u %u %u %lu %lu %lu %lu%n",
 				&min_sz, &max_sz, &min_nr_a, &max_nr_a,
 				&min_age, &max_age, &action, &quota.ms,
 				&quota.sz, &quota.reset_interval,
 				&quota.weight_sz, &quota.weight_nr_accesses,
-				&quota.weight_age, &parsed);
-		if (ret != 13)
+				&quota.weight_age, &wmarks.metric,
+				&wmarks.interval, &wmarks.high, &wmarks.mid,
+				&wmarks.low, &parsed);
+		if (ret != 18)
 			break;
 		if (!damos_action_valid(action)) {
 			pr_err("wrong action %d\n", action);
_