diff options
Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-bdi')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-bdi | 50 |
1 files changed, 0 insertions, 50 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-bdi b/Documentation/ABI/testing/sysfs-class-bdi deleted file mode 100644 index 5f500977b42..00000000000 --- a/Documentation/ABI/testing/sysfs-class-bdi +++ /dev/null @@ -1,50 +0,0 @@ -What: /sys/class/bdi/<bdi>/ -Date: January 2008 -Contact: Peter Zijlstra <a.p.zijlstra@chello.nl> -Description: - -Provide a place in sysfs for the backing_dev_info object. This allows -setting and retrieving various BDI specific variables. - -The <bdi> identifier can be either of the following: - -MAJOR:MINOR - - Device number for block devices, or value of st_dev on - non-block filesystems which provide their own BDI, such as NFS - and FUSE. - -MAJOR:MINOR-fuseblk - - Value of st_dev on fuseblk filesystems. - -default - - The default backing dev, used for non-block device backed - filesystems which do not provide their own BDI. - -Files under /sys/class/bdi/<bdi>/ ---------------------------------- - -read_ahead_kb (read-write) - - Size of the read-ahead window in kilobytes - -min_ratio (read-write) - - 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. - - 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. - -max_ratio (read-write) - - 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. |