1 What: /sys/fs/ext4/<disk>/mb_stats
2 Date: March 2008
3 Contact: "Theodore Ts'o" <tytso@mit.edu>
4 Description:
5 Controls whether the multiblo
6 collect statistics, which are
7 1 means to collect statistics
8 statistics
9
10 What: /sys/fs/ext4/<disk>/mb_group_p
11 Date: March 2008
12 Contact: "Theodore Ts'o" <tytso@mit.edu>
13 Description:
14 The multiblock allocator will
15 requests to a multiple of this
16 stripe size is not set in the
17
18 What: /sys/fs/ext4/<disk>/mb_max_to_
19 Date: March 2008
20 Contact: "Theodore Ts'o" <tytso@mit.edu>
21 Description:
22 The maximum number of extents
23 will search to find the best e
24
25 What: /sys/fs/ext4/<disk>/mb_min_to_
26 Date: March 2008
27 Contact: "Theodore Ts'o" <tytso@mit.edu>
28 Description:
29 The minimum number of extents
30 will search to find the best e
31
32 What: /sys/fs/ext4/<disk>/mb_order2_
33 Date: March 2008
34 Contact: "Theodore Ts'o" <tytso@mit.edu>
35 Description:
36 Tuning parameter which control
37 requests (as a power of 2) whe
38 used
39
40 What: /sys/fs/ext4/<disk>/mb_stream_
41 Date: March 2008
42 Contact: "Theodore Ts'o" <tytso@mit.edu>
43 Description:
44 Files which have fewer blocks
45 parameter will have their bloc
46 block group specific prealloca
47 files are packed closely toget
48 will have its blocks allocated
49 preallocation pool.
50
51 What: /sys/fs/ext4/<disk>/inode_read
52 Date: March 2008
53 Contact: "Theodore Ts'o" <tytso@mit.edu>
54 Description:
55 Tuning parameter which control
56 inode table blocks that ext4's
57 algorithm will pre-read into t
58
59 What: /sys/fs/ext4/<disk>/delayed_al
60 Date: March 2008
61 Contact: "Theodore Ts'o" <tytso@mit.edu>
62 Description:
63 This file is read-only and sho
64 that are dirty in the page cac
65 have their location in the fil
66
67 What: /sys/fs/ext4/<disk>/lifetime_w
68 Date: March 2008
69 Contact: "Theodore Ts'o" <tytso@mit.edu>
70 Description:
71 This file is read-only and sho
72 of data that have been written
73 created.
74
75 What: /sys/fs/ext4/<disk>/session_wr
76 Date: March 2008
77 Contact: "Theodore Ts'o" <tytso@mit.edu>
78 Description:
79 This file is read-only and sho
80 kilobytes of data that have be
81 filesystem since it was mounte
82
83 What: /sys/fs/ext4/<disk>/inode_goal
84 Date: June 2008
85 Contact: "Theodore Ts'o" <tytso@mit.edu>
86 Description:
87 Tuning parameter which (if non
88 inode used by the inode alloca
89 all other allocation heuristic
90 debugging use only, and should
91 systems.
92
93 What: /sys/fs/ext4/<disk>/max_writeb
94 Date: September 2009
95 Contact: "Theodore Ts'o" <tytso@mit.edu>
96 Description:
97 The maximum number of megabyte
98 try to write out before move o
99
100 What: /sys/fs/ext4/<disk>/extent_max
101 Date: August 2012
102 Contact: "Theodore Ts'o" <tytso@mit.edu>
103 Description:
104 The maximum number of kilobyte
105 out in preference to creating
106 extent when manipulating an in
107 that using a larger value will
108 variability of time necessary
109 write operation (since a 4k ra
110 into a much larger write due t
111 operation).
112
113 What: /sys/fs/ext4/<disk>/journal_ta
114 Date: February 2019
115 Contact: "Theodore Ts'o" <tytso@mit.edu>
116 Description:
117 This file is read-only and sho
118 current pid-namespace or 0 if
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