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Linus Torvalds
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Apr 30, 2008
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refs/heads/master: fd403dc84f29aee613d13bde5656ba74cdee1e7b | ||
refs/heads/master: ccf2779544eecfcc5447e2028d1029b6d4ff7bb6 |
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What: /sys/class/bdi/<bdi>/ | ||
Date: January 2008 | ||
Contact: Peter Zijlstra <a.p.zijlstra@chello.nl> | ||
Description: | ||
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Provide a place in sysfs for the backing_dev_info object. This allows | ||
setting and retrieving various BDI specific variables. | ||
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The <bdi> identifier can be either of the following: | ||
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MAJOR:MINOR | ||
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Device number for block devices, or value of st_dev on | ||
non-block filesystems which provide their own BDI, such as NFS | ||
and FUSE. | ||
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default | ||
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The default backing dev, used for non-block device backed | ||
filesystems which do not provide their own BDI. | ||
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Files under /sys/class/bdi/<bdi>/ | ||
--------------------------------- | ||
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read_ahead_kb (read-write) | ||
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Size of the read-ahead window in kilobytes | ||
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min_ratio (read-write) | ||
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Under normal circumstances each device is given a part of the | ||
total write-back cache that relates to its current average | ||
writeout speed in relation to the other devices. | ||
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The 'min_ratio' parameter allows assigning a minimum | ||
percentage of the write-back cache to a particular device. | ||
For example, this is useful for providing a minimum QoS. | ||
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max_ratio (read-write) | ||
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Allows limiting a particular device to use not more than the | ||
given percentage of the write-back cache. This is useful in | ||
situations where we want to avoid one device taking all or | ||
most of the write-back cache. For example in case of an NFS | ||
mount that is prone to get stuck, or a FUSE mount which cannot | ||
be trusted to play fair. |
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