linux-kernel - [RFC v2 11/14] mm/damon/dbgfs: Support watermarks

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Date:   Tue,  8 Jun 2021 11:52:51 +0000
From:   SeongJae Park <sj38.park@...il.com>
To:     akpm@...ux-foundation.org
Cc:     SeongJae Park <sjpark@...zon.de>, Jonathan.Cameron@...wei.com,
        acme@...nel.org, alexander.shishkin@...ux.intel.com,
        amit@...nel.org, benh@...nel.crashing.org,
        brendanhiggins@...gle.com, corbet@....net, david@...hat.com,
        dwmw@...zon.com, elver@...gle.com, fan.du@...el.com,
        foersleo@...zon.de, greg@...ah.com, gthelen@...gle.com,
        guoju.fgj@...baba-inc.com, jgowans@...zon.com, mgorman@...e.de,
        minchan@...nel.org, mingo@...hat.com, namhyung@...nel.org,
        peterz@...radead.org, riel@...riel.com, rientjes@...gle.com,
        rostedt@...dmis.org, rppt@...nel.org, shakeelb@...gle.com,
        shuah@...nel.org, sj38.park@...il.com, snu@...le79.org,
        vbabka@...e.cz, vdavydov.dev@...il.com, zgf574564920@...il.com,
        linux-damon@...zon.com, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC v2 11/14] mm/damon/dbgfs: Support watermarks

From: SeongJae Park <sjpark@...zon.de>

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 <sjpark@...zon.de>
---
 mm/damon/dbgfs.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c
index 1680fb1be8e1..768ef3eb9550 100644
--- a/mm/damon/dbgfs.c
+++ b/mm/damon/dbgfs.c
@@ -227,7 +227,7 @@ 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 %u %u %u %lu %lu\n",
+				"%lu %lu %u %u %u %u %d %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,
@@ -235,6 +235,8 @@ static ssize_t sprint_schemes(struct damon_ctx *c, char *buf, ssize_t len)
 				s->limit.weight_sz,
 				s->limit.weight_nr_accesses,
 				s->limit.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;
@@ -315,18 +317,18 @@ 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_speed_limit limit = {};
-		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 %u %u %u%n",
+				"%lu %lu %u %u %u %u %u %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, &limit.sz,
 				&limit.ms, &limit.weight_sz,
 				&limit.weight_nr_accesses, &limit.weight_age,
+				&wmarks.metric, &wmarks.interval,
+				&wmarks.high, &wmarks.mid, &wmarks.low,
 				&parsed);
-		if (ret != 12)
+		if (ret != 17)
 			break;
 		if (!damos_action_valid(action)) {
 			pr_err("wrong action %d\n", action);
-- 
2.17.1