linux-kernel - [RFC v2 04/14] mm/damon/dbgfs: Support schemes speed limit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20210608115254.11930-5-sj38.park@gmail.com>
Date:   Tue,  8 Jun 2021 11:52:44 +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 04/14] mm/damon/dbgfs: Support schemes speed limit

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

This commit makes the debugfs interface of DAMON to support the schemes
speed limit by chaning the format of the input for the schemes file.

Signed-off-by: SeongJae Park <sjpark@...zon.de>
---
 mm/damon/dbgfs.c | 30 +++++++++++++++++++++++-------
 1 file changed, 23 insertions(+), 7 deletions(-)

diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c
index 4b45b69db697..ea6d4fdb57fa 100644
--- a/mm/damon/dbgfs.c
+++ b/mm/damon/dbgfs.c
@@ -227,11 +227,12 @@ 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\n",
+				"%lu %lu %u %u %u %u %d %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,
-				s->action, s->stat_count, s->stat_sz);
+				s->action, s->limit.sz, s->limit.ms,
+				s->stat_count, s->stat_sz);
 		if (!rc)
 			return -ENOMEM;
 
@@ -312,10 +313,11 @@ 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%n",
+		ret = sscanf(&str[pos], "%lu %lu %u %u %u %u %u %lu %lu%n",
 				&min_sz, &max_sz, &min_nr_a, &max_nr_a,
-				&min_age, &max_age, &action, &parsed);
-		if (ret != 7)
+				&min_age, &max_age, &action, &limit.sz,
+				&limit.ms, &parsed);
+		if (ret != 9)
 			break;
 		if (!damos_action_valid(action)) {
 			pr_err("wrong action %d\n", action);
@@ -1133,6 +1135,15 @@ static ssize_t dbgfs_monitor_on_write(struct file *file,
 	return ret;
 }
 
+/*
+ * v1: Add the scheme speed limit
+ */
+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);
+}
+
 static const struct file_operations mk_contexts_fops = {
 	.owner = THIS_MODULE,
 	.write = dbgfs_mk_context_write,
@@ -1149,13 +1160,18 @@ static const struct file_operations monitor_on_fops = {
 	.write = dbgfs_monitor_on_write,
 };
 
+static const struct file_operations version_fops = {
+	.owner = THIS_MODULE,
+	.read = dbgfs_version_read,
+};
+
 static int __init __damon_dbgfs_init(void)
 {
 	struct dentry *dbgfs_root;
 	const char * const file_names[] = {"mk_contexts", "rm_contexts",
-		"monitor_on"};
+		"monitor_on", "version"};
 	const struct file_operations *fops[] = {&mk_contexts_fops,
-		&rm_contexts_fops, &monitor_on_fops};
+		&rm_contexts_fops, &monitor_on_fops, &version_fops};
 	int i;
 
 	dbgfs_root = debugfs_create_dir("damon", NULL);
-- 
2.17.1