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| author | Stefan Roesch <shr@devkernel.io> | 2022-11-18 16:52:14 -0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-11-30 15:59:06 -0800 |
| commit | ad3e6dabf6f7d9ffd68eb711191ef16cdbdd25f0 (patch) | |
| tree | 662daa8c90438f59af327242a1168434d8c8f50c /mm/backing-dev.c | |
| parent | 2c44af4f2aaa260199f218f11920c406e688693c (diff) | |
| download | lwn-ad3e6dabf6f7d9ffd68eb711191ef16cdbdd25f0.tar.gz lwn-ad3e6dabf6f7d9ffd68eb711191ef16cdbdd25f0.zip | |
mm: add /sys/class/bdi/<bdi>/min_ratio_fine knob
This adds the min_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/20221119005215.3052436-20-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.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 94c2382367cf..a53b9360b72e 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -180,6 +180,25 @@ static ssize_t min_ratio_store(struct device *dev, } BDI_SHOW(min_ratio, bdi->min_ratio / BDI_RATIO_SCALE) +static ssize_t min_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_min_ratio_no_scale(bdi, ratio); + if (!ret) + ret = count; + + return ret; +} +BDI_SHOW(min_ratio_fine, bdi->min_ratio) + static ssize_t max_ratio_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { @@ -315,6 +334,7 @@ static DEVICE_ATTR_RW(strict_limit); static struct attribute *bdi_dev_attrs[] = { &dev_attr_read_ahead_kb.attr, &dev_attr_min_ratio.attr, + &dev_attr_min_ratio_fine.attr, &dev_attr_max_ratio.attr, &dev_attr_max_ratio_fine.attr, &dev_attr_min_bytes.attr, |