| Theodore Ts'o | 3197ebd | 2009-03-31 09:10:09 -0400 | [diff] [blame] | 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 multiblock allocator should |
| 6 | collect statistics, which are shown during the unmount. |
| 7 | 1 means to collect statistics, 0 means not to collect |
| 8 | statistics |
| 9 | |
| 10 | What: /sys/fs/ext4/<disk>/mb_group_prealloc |
| 11 | Date: March 2008 |
| 12 | Contact: "Theodore Ts'o" <tytso@mit.edu> |
| 13 | Description: |
| 14 | The multiblock allocator will round up allocation |
| 15 | requests to a multiple of this tuning parameter if the |
| 16 | stripe size is not set in the ext4 superblock |
| 17 | |
| 18 | What: /sys/fs/ext4/<disk>/mb_max_to_scan |
| 19 | Date: March 2008 |
| 20 | Contact: "Theodore Ts'o" <tytso@mit.edu> |
| 21 | Description: |
| 22 | The maximum number of extents the multiblock allocator |
| 23 | will search to find the best extent |
| 24 | |
| 25 | What: /sys/fs/ext4/<disk>/mb_min_to_scan |
| 26 | Date: March 2008 |
| 27 | Contact: "Theodore Ts'o" <tytso@mit.edu> |
| 28 | Description: |
| 29 | The minimum number of extents the multiblock allocator |
| 30 | will search to find the best extent |
| 31 | |
| 32 | What: /sys/fs/ext4/<disk>/mb_order2_req |
| 33 | Date: March 2008 |
| 34 | Contact: "Theodore Ts'o" <tytso@mit.edu> |
| 35 | Description: |
| 36 | Tuning parameter which controls the minimum size for |
| 37 | requests (as a power of 2) where the buddy cache is |
| 38 | used |
| 39 | |
| 40 | What: /sys/fs/ext4/<disk>/mb_stream_req |
| 41 | Date: March 2008 |
| 42 | Contact: "Theodore Ts'o" <tytso@mit.edu> |
| 43 | Description: |
| 44 | Files which have fewer blocks than this tunable |
| 45 | parameter will have their blocks allocated out of a |
| 46 | block group specific preallocation pool, so that small |
| 47 | files are packed closely together. Each large file |
| 48 | will have its blocks allocated out of its own unique |
| 49 | preallocation pool. |
| 50 | |
| 51 | What: /sys/fs/ext4/<disk>/inode_readahead |
| 52 | Date: March 2008 |
| 53 | Contact: "Theodore Ts'o" <tytso@mit.edu> |
| 54 | Description: |
| 55 | Tuning parameter which controls the maximum number of |
| 56 | inode table blocks that ext4's inode table readahead |
| 57 | algorithm will pre-read into the buffer cache |
| 58 | |
| 59 | What: /sys/fs/ext4/<disk>/delayed_allocation_blocks |
| 60 | Date: March 2008 |
| 61 | Contact: "Theodore Ts'o" <tytso@mit.edu> |
| 62 | Description: |
| 63 | This file is read-only and shows the number of blocks |
| 64 | that are dirty in the page cache, but which do not |
| 65 | have their location in the filesystem allocated yet. |
| 66 | |
| 67 | What: /sys/fs/ext4/<disk>/lifetime_write_kbytes |
| 68 | Date: March 2008 |
| 69 | Contact: "Theodore Ts'o" <tytso@mit.edu> |
| 70 | Description: |
| 71 | This file is read-only and shows the number of kilobytes |
| 72 | of data that have been written to this filesystem since it was |
| 73 | created. |
| 74 | |
| 75 | What: /sys/fs/ext4/<disk>/session_write_kbytes |
| 76 | Date: March 2008 |
| 77 | Contact: "Theodore Ts'o" <tytso@mit.edu> |
| 78 | Description: |
| 79 | This file is read-only and shows the number of |
| 80 | kilobytes of data that have been written to this |
| 81 | filesystem since it was mounted. |
| Andreas Dilger | 1101391 | 2009-06-13 11:45:35 -0400 | [diff] [blame] | 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-zero) controls the goal |
| 88 | inode used by the inode allocator in p0reference to |
| 89 | all other allocation hueristics. This is intended for |
| 90 | debugging use only, and should be 0 on production |
| 91 | systems. |