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mm: bdi: export BDI attributes in sysfs
[linux-2.6.git] / Documentation / ABI / testing / sysfs-class-bdi
1 What:           /sys/class/bdi/<bdi>/
2 Date:           January 2008
3 Contact:        Peter Zijlstra <a.p.zijlstra@chello.nl>
4 Description:
5
6 Provide a place in sysfs for the backing_dev_info object.
7 This allows us to see and set the various BDI specific variables.
8
9 The <bdi> identifier can be either of the following:
10
11 MAJOR:MINOR
12
13         Device number for block devices, or value of st_dev on
14         non-block filesystems which provide their own BDI, such as NFS
15         and FUSE.
16
17 default
18
19         The default backing dev, used for non-block device backed
20         filesystems which do not provide their own BDI.
21
22 Files under /sys/class/bdi/<bdi>/
23 ---------------------------------
24
25 read_ahead_kb (read-write)
26
27         Size of the read-ahead window in kilobytes
28
29 reclaimable_kb (read-only)
30
31         Reclaimable (dirty or unstable) memory destined for writeback
32         to this device
33
34 writeback_kb (read-only)
35
36         Memory currently under writeback to this device
37
38 dirty_kb (read-only)
39
40         Global threshold for reclaimable + writeback memory
41
42 bdi_dirty_kb (read-only)
43
44         Current threshold on this BDI for reclaimable + writeback
45         memory
46