mm: add knob /sys/class/bdi/<bdi>/max_bytes
This adds the new knob max_bytes to specify a dirty memory limit for the corresponding bdi. The specified bytes value is converted to a ratio. Link: https://lkml.kernel.org/r/20221119005215.3052436-9-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>
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@ -199,6 +199,34 @@ static ssize_t max_ratio_store(struct device *dev,
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}
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BDI_SHOW(max_ratio, bdi->max_ratio / BDI_RATIO_SCALE)
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static ssize_t max_bytes_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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{
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struct backing_dev_info *bdi = dev_get_drvdata(dev);
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return sysfs_emit(buf, "%llu\n", bdi_get_max_bytes(bdi));
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}
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static ssize_t max_bytes_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct backing_dev_info *bdi = dev_get_drvdata(dev);
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u64 bytes;
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ssize_t ret;
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ret = kstrtoull(buf, 10, &bytes);
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if (ret < 0)
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return ret;
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ret = bdi_set_max_bytes(bdi, bytes);
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if (!ret)
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ret = count;
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return ret;
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}
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DEVICE_ATTR_RW(max_bytes);
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static ssize_t stable_pages_required_show(struct device *dev,
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struct device_attribute *attr,
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char *buf)
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@ -241,6 +269,7 @@ static struct attribute *bdi_dev_attrs[] = {
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&dev_attr_read_ahead_kb.attr,
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&dev_attr_min_ratio.attr,
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&dev_attr_max_ratio.attr,
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&dev_attr_max_bytes.attr,
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&dev_attr_stable_pages_required.attr,
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&dev_attr_strict_limit.attr,
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NULL,
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