diff options
Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-bdi')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-bdi | 30 |
1 files changed, 21 insertions, 9 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-bdi b/Documentation/ABI/testing/sysfs-class-bdi index 5402bd74ba43..6d2a2fc189dd 100644 --- a/Documentation/ABI/testing/sysfs-class-bdi +++ b/Documentation/ABI/testing/sysfs-class-bdi @@ -23,14 +23,17 @@ 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) - +What: /sys/class/bdi/<bdi>/read_ahead_kb +Date: January 2008 +Contact: Peter Zijlstra <a.p.zijlstra@chello.nl> +Description: Size of the read-ahead window in kilobytes -min_ratio (read-write) - + (read-write) +What: /sys/class/bdi/<bdi>/min_ratio +Date: January 2008 +Contact: Peter Zijlstra <a.p.zijlstra@chello.nl> +Description: 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. @@ -39,8 +42,12 @@ min_ratio (read-write) percentage of the write-back cache to a particular device. For example, this is useful for providing a minimum QoS. -max_ratio (read-write) + (read-write) +What: /sys/class/bdi/<bdi>/max_ratio +Date: January 2008 +Contact: Peter Zijlstra <a.p.zijlstra@chello.nl> +Description: 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 @@ -48,7 +55,12 @@ max_ratio (read-write) mount that is prone to get stuck, or a FUSE mount which cannot be trusted to play fair. -stable_pages_required (read-only) - + (read-write) +What: /sys/class/bdi/<bdi>/stable_pages_required +Date: January 2008 +Contact: Peter Zijlstra <a.p.zijlstra@chello.nl> +Description: If set, the backing device requires that all pages comprising a write request must not be changed until writeout is complete. + + (read-only) |