This adds the max_ratio_fine knob. The knob specifies the values not
based on 1 of 100, but instead 1 per million.
Signed-off-by: Stefan Roesch <shr@xxxxxxxxxxxx>
---
mm/backing-dev.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 3fab79061ade..94c2382367cf 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -199,6 +199,25 @@ static ssize_t max_ratio_store(struct device *dev,
}
BDI_SHOW(max_ratio, bdi->max_ratio / BDI_RATIO_SCALE)
+static ssize_t max_ratio_fine_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct backing_dev_info *bdi = dev_get_drvdata(dev);
+ unsigned int ratio;
+ ssize_t ret;
+
+ ret = kstrtouint(buf, 10, &ratio);
+ if (ret < 0)
+ return ret;
+
+ ret = bdi_set_max_ratio_no_scale(bdi, ratio);
+ if (!ret)
+ ret = count;
+
+ return ret;
+}
+BDI_SHOW(max_ratio_fine, bdi->max_ratio)
+
static ssize_t min_bytes_show(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -297,6 +316,7 @@ static struct attribute *bdi_dev_attrs[] = {
&dev_attr_read_ahead_kb.attr,
&dev_attr_min_ratio.attr,
&dev_attr_max_ratio.attr,
+ &dev_attr_max_ratio_fine.attr,
&dev_attr_min_bytes.attr,
&dev_attr_max_bytes.attr,
&dev_attr_stable_pages_required.attr,
--
2.30.2
