[patch 247/262] mm/damon/dbgfs: support prioritization weights

Andrew Morton
2021-11-05T20:47:43Z

From: SeongJae Park <sj@kernel.org>
Subject: mm/damon/dbgfs: support prioritization weights

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

Link: https://lkml.kernel.org/r/20211019150731.16699-10-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Amit Shah <amit@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: David Woodhouse <dwmw@amazon.com>
Cc: Greg Thelen <gthelen@google.com>
Cc: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Leonard Foerster <foersleo@amazon.de>
Cc: Marco Elver <elver@google.com>
Cc: Markus Boehme <markubo@amazon.de>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

mm/damon/dbgfs.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)

--- a/mm/damon/dbgfs.c~mm-damon-dbgfs-support-prioritization-weights
+++ a/mm/damon/dbgfs.c
@@ -105,13 +105,16 @@ 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 %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;
@@ -193,11 +196,14 @@ static struct damos **str_to_schemes(con
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);
_