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authorStefan Roesch <shr@devkernel.io>2022-11-19 03:52:11 +0300
committerAndrew Morton <akpm@linux-foundation.org>2022-12-01 02:59:06 +0300
commitbca52dcbadc583f4db6435599c44a79f97293f06 (patch)
tree49438f7be6ba6b9ea1935ddbb96337553f56b0bd /mm/backing-dev.c
parent4e230b406eda9bdf7f8a71e2cc3df18a824abcb0 (diff)
downloadlinux-bca52dcbadc583f4db6435599c44a79f97293f06.tar.xz
mm: add /sys/class/bdi/<bdi>/max_ratio_fine knob
This adds the max_ratio_fine knob. The knob specifies the values not based on 1 of 100, but instead 1 per million. Link: https://lkml.kernel.org/r/20221119005215.3052436-17-shr@devkernel.io Signed-off-by: Stefan Roesch <shr@devkernel.io> Cc: Chris Mason <clm@meta.com> Cc: Jens Axboe <axboe@kernel.dk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/backing-dev.c')
-rw-r--r--mm/backing-dev.c20
1 files changed, 20 insertions, 0 deletions
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,