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Diffstat (limited to 'Documentation/ABI/testing/sysfs-class-bdi')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-bdi | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-bdi b/Documentation/ABI/testing/sysfs-class-bdi new file mode 100644 index 000000000000..b800cdda40bb --- /dev/null +++ b/Documentation/ABI/testing/sysfs-class-bdi @@ -0,0 +1,46 @@ +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 us to see and set the 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. + +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 + +reclaimable_kb (read-only) + + Reclaimable (dirty or unstable) memory destined for writeback + to this device + +writeback_kb (read-only) + + Memory currently under writeback to this device + +dirty_kb (read-only) + + Global threshold for reclaimable + writeback memory + +bdi_dirty_kb (read-only) + + Current threshold on this BDI for reclaimable + writeback + memory + |