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

[cgel . zte]

From: xu xin <xu.xin16@xxxxxxxxxx>

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

Signed-off-by: xu xin <xu.xin16@xxxxxxxxxx>
Signed-off-by: CGEL <cgel.zte@xxxxxxxxx>
---
 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