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Subject[RFC v3 09/15] mm/damon/dbgfs: Support prioritization weights
Date
From: SeongJae Park <sjpark@amazon.de>

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 <sjpark@amazon.de>
---
mm/damon/dbgfs.c | 16 +++++++++++-----
1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c
index 3cd253a07116..93ac15cb5786 100644
--- a/mm/damon/dbgfs.c
+++ b/mm/damon/dbgfs.c
@@ -227,13 +227,16 @@ 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 %lu\n",
+ "%lu %lu %u %u %u %u %d %lu %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->quota.ms, s->quota.sz,
s->quota.reset_interval,
+ s->quota.weight_sz,
+ s->quota.weight_nr_accesses,
+ s->quota.weight_age,
s->stat_count, s->stat_sz);
if (!rc)
return -ENOMEM;
@@ -315,11 +318,14 @@ static struct damos **str_to_schemes(const char *str, ssize_t len,
while (pos < len && *nr_schemes < max_nr_schemes) {
struct damos_quota quota = {};

- ret = sscanf(&str[pos], "%lu %lu %u %u %u %u %u %lu %lu %lu%n",
+ ret = sscanf(&str[pos],
+ "%lu %lu %u %u %u %u %u %lu %lu %lu %u %u %u%n",
&min_sz, &max_sz, &min_nr_a, &max_nr_a,
&min_age, &max_age, &action, &quota.ms,
- &quota.sz, &quota.reset_interval, &parsed);
- if (ret != 10)
+ &quota.sz, &quota.reset_interval,
+ &quota.weight_sz, &quota.weight_nr_accesses,
+ &quota.weight_age, &parsed);
+ if (ret != 13)
break;
if (!damos_action_valid(action)) {
pr_err("wrong action %d\n", action);
@@ -1147,7 +1153,7 @@ 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 = {
--
2.17.1
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