[PATCH 12/15] mm/damon/dbgfs: Support watermarks

From: SeongJae Park
Date: Tue Oct 19 2021 - 11:08:39 EST


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

Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
---
mm/damon/dbgfs.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c
index 9f13060d1058..6828e463348b 100644
--- a/mm/damon/dbgfs.c
+++ b/mm/damon/dbgfs.c
@@ -105,7 +105,7 @@ 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 %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 damon_ctx *c, char *buf, ssize_t len)
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(const char *str, ssize_t len,
*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);
--
2.17.1