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mm: add /sys/class/bdi/<bdi>/max_ratio_fine knob

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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>
This commit is contained in:
Stefan Roesch 2022-11-18 16:52:11 -08:00 committed by Andrew Morton
parent 4e230b406e
commit bca52dcbad
1 changed files with 20 additions and 0 deletions
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20
mm/backing-dev.c
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@ -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,