summaryrefslogtreecommitdiff
path: root/Documentation/ABI/testing/sysfs-class-bdi
blob: 5ac1e01bbd483fe5b9f28d9b52890ee7f0771087 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
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
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.

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.