linux-kernel - [RFC PATCH 4/4] ksm: show ksmd status of auto mode

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Message-Id: <20220803100559.1653604-1-xu.xin16@zte.con.cn>
Date:   Wed,  3 Aug 2022 10:05:59 +0000
From:   cgel.zte@...il.com
To:     akpm@...ux-foundation.org
Cc:     hughd@...gle.com, izik.eidus@...ellosystems.com,
        willy@...radead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, xu xin <xu.xin16@....com.cn>,
        CGEL <cgel.zte@...il.com>
Subject: [RFC PATCH 4/4] ksm: show ksmd status of auto mode

From: xu xin <xu.xin16@....com.cn>

Add a sysfs interface of ksmd_status to show some details related
with auto-mode.

Signed-off-by: xu xin <xu.xin16@....com.cn>
Signed-off-by: CGEL <cgel.zte@...il.com>
---
 mm/ksm.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/mm/ksm.c b/mm/ksm.c
index 78819b56efec..6417bc034a3d 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -3070,6 +3070,29 @@ static ssize_t run_store(struct kobject *kobj, struct kobj_attribute *attr,
 }
 KSM_ATTR(run);
 
+static ssize_t ksmd_status_show(struct kobject *kobj,
+				struct kobj_attribute *attr, char *buf)
+{
+	int len = 0;
+
+	if (ksm_run & KSM_RUN_AUTO) {
+		len += sysfs_emit_at(buf, len, "mode: auto\n");
+		len += sysfs_emit_at(buf, len, "auto_triggered %d\n",
+							auto_triggered);
+		len += sysfs_emit_at(buf, len, "scanning_factor: %u\n",
+							scanning_factor);
+	} else if (ksm_run & KSM_RUN_MERGE)
+		len += sysfs_emit_at(buf, len, "mode: on\n");
+	else if (ksm_run & KSM_RUN_UNMERGE)
+		len += sysfs_emit_at(buf, len, "mode: unmerge\n");
+	else
+		len += sysfs_emit_at(buf, len, "mode: off\n");
+
+
+	return len;
+}
+KSM_ATTR_RO(ksmd_status);
+
 static ssize_t max_scanning_factor_show(struct kobject *kobj,
 						struct kobj_attribute *attr, char *buf)
 {
@@ -3332,6 +3355,7 @@ static struct attribute *ksm_attrs[] = {
 	&sleep_millisecs_attr.attr,
 	&pages_to_scan_attr.attr,
 	&run_attr.attr,
+	&ksmd_status_attr.attr,
 	&max_scanning_factor_attr.attr,
 	&auto_threshold_percent_attr.attr,
 	&pages_shared_attr.attr,
-- 
2.25.1