[RFC,v2,08/14] mm/damon/dbgfs: Support prioritization weights

Commit Message

SeongJae Park June 8, 2021, 11:52 a.m. UTC

From: SeongJae Park <[e-mail]>

This commit allows DAMON debugfs interface users set the prioritization
weights by putting three more numbers to the 'schemes' file.

Signed-off-by: SeongJae Park <[e-mail]>
---
 mm/damon/dbgfs.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

Patch

diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c
index ea6d4fdb57fa..b90287b1e576 100644
--- a/mm/damon/dbgfs.c
+++ b/mm/damon/dbgfs.c
@@ -227,11 +227,14 @@  static ssize_t sprint_schemes(struct damon_ctx *c, char *buf, ssize_t len)
 
 	damon_for_each_scheme(s, c) {
 		rc = scnprintf(&buf[written], len - written,
-				"%lu %lu %u %u %u %u %d %lu %lu %lu %lu\n",
+				"%lu %lu %u %u %u %u %d %lu %lu %u %u %u %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,
 				s->action, s->limit.sz, s->limit.ms,
+				s->limit.weight_sz,
+				s->limit.weight_nr_accesses,
+				s->limit.weight_age,
 				s->stat_count, s->stat_sz);
 		if (!rc)
 			return -ENOMEM;
@@ -313,11 +316,14 @@  static struct damos **str_to_schemes(const char *str, ssize_t len,
 	while (pos < len && *nr_schemes < max_nr_schemes) {
 		struct damos_speed_limit limit = {};
 
-		ret = sscanf(&str[pos], "%lu %lu %u %u %u %u %u %lu %lu%n",
+		ret = sscanf(&str[pos],
+				"%lu %lu %u %u %u %u %u %lu %lu %u %u %u%n",
 				&min_sz, &max_sz, &min_nr_a, &max_nr_a,
 				&min_age, &max_age, &action, &limit.sz,
-				&limit.ms, &parsed);
-		if (ret != 9)
+				&limit.ms, &limit.weight_sz,
+				&limit.weight_nr_accesses, &limit.weight_age,
+				&parsed);
+		if (ret != 12)
 			break;
 		if (!damos_action_valid(action)) {
 			pr_err("wrong action %d\n", action);
@@ -1141,7 +1147,7 @@  static ssize_t dbgfs_monitor_on_write(struct file *file,
 static ssize_t dbgfs_version_read(struct file *file,
 		char __user *buf, size_t count, loff_t *ppos)
 {
-	return simple_read_from_buffer(buf, count, ppos, "1\n", 2);
+	return simple_read_from_buffer(buf, count, ppos, "2\n", 2);
 }
 
 static const struct file_operations mk_contexts_fops = {