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118 lines
3.9 KiB
118 lines
3.9 KiB
What: /sys/fs/ext4/<disk>/mb_stats |
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Date: March 2008 |
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Contact: "Theodore Ts'o" <[email protected]> |
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Description: |
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Controls whether the multiblock allocator should |
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collect statistics, which are shown during the unmount. |
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1 means to collect statistics, 0 means not to collect |
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statistics |
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What: /sys/fs/ext4/<disk>/mb_group_prealloc |
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Date: March 2008 |
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Contact: "Theodore Ts'o" <[email protected]> |
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Description: |
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The multiblock allocator will round up allocation |
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requests to a multiple of this tuning parameter if the |
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stripe size is not set in the ext4 superblock |
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What: /sys/fs/ext4/<disk>/mb_max_to_scan |
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Date: March 2008 |
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Contact: "Theodore Ts'o" <[email protected]> |
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Description: |
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The maximum number of extents the multiblock allocator |
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will search to find the best extent |
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What: /sys/fs/ext4/<disk>/mb_min_to_scan |
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Date: March 2008 |
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Contact: "Theodore Ts'o" <[email protected]> |
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Description: |
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The minimum number of extents the multiblock allocator |
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will search to find the best extent |
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What: /sys/fs/ext4/<disk>/mb_order2_req |
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Date: March 2008 |
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Contact: "Theodore Ts'o" <[email protected]> |
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Description: |
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Tuning parameter which controls the minimum size for |
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requests (as a power of 2) where the buddy cache is |
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used |
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What: /sys/fs/ext4/<disk>/mb_stream_req |
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Date: March 2008 |
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Contact: "Theodore Ts'o" <[email protected]> |
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Description: |
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Files which have fewer blocks than this tunable |
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parameter will have their blocks allocated out of a |
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block group specific preallocation pool, so that small |
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files are packed closely together. Each large file |
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will have its blocks allocated out of its own unique |
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preallocation pool. |
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What: /sys/fs/ext4/<disk>/inode_readahead_blks |
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Date: March 2008 |
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Contact: "Theodore Ts'o" <[email protected]> |
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Description: |
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Tuning parameter which controls the maximum number of |
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inode table blocks that ext4's inode table readahead |
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algorithm will pre-read into the buffer cache |
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What: /sys/fs/ext4/<disk>/delayed_allocation_blocks |
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Date: March 2008 |
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Contact: "Theodore Ts'o" <[email protected]> |
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Description: |
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This file is read-only and shows the number of blocks |
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that are dirty in the page cache, but which do not |
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have their location in the filesystem allocated yet. |
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What: /sys/fs/ext4/<disk>/lifetime_write_kbytes |
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Date: March 2008 |
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Contact: "Theodore Ts'o" <[email protected]> |
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Description: |
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This file is read-only and shows the number of kilobytes |
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of data that have been written to this filesystem since it was |
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created. |
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What: /sys/fs/ext4/<disk>/session_write_kbytes |
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Date: March 2008 |
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Contact: "Theodore Ts'o" <[email protected]> |
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Description: |
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This file is read-only and shows the number of |
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kilobytes of data that have been written to this |
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filesystem since it was mounted. |
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What: /sys/fs/ext4/<disk>/inode_goal |
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Date: June 2008 |
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Contact: "Theodore Ts'o" <[email protected]> |
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Description: |
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Tuning parameter which (if non-zero) controls the goal |
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inode used by the inode allocator in preference to |
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all other allocation heuristics. This is intended for |
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debugging use only, and should be 0 on production |
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systems. |
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What: /sys/fs/ext4/<disk>/max_writeback_mb_bump |
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Date: September 2009 |
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Contact: "Theodore Ts'o" <[email protected]> |
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Description: |
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The maximum number of megabytes the writeback code will |
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try to write out before move on to another inode. |
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What: /sys/fs/ext4/<disk>/extent_max_zeroout_kb |
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Date: August 2012 |
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Contact: "Theodore Ts'o" <[email protected]> |
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Description: |
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The maximum number of kilobytes which will be zeroed |
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out in preference to creating a new uninitialized |
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extent when manipulating an inode's extent tree. Note |
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that using a larger value will increase the |
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variability of time necessary to complete a random |
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write operation (since a 4k random write might turn |
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into a much larger write due to the zeroout |
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operation). |
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What: /sys/fs/ext4/<disk>/journal_task |
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Date: February 2019 |
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Contact: "Theodore Ts'o" <[email protected]> |
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Description: |
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This file is read-only and shows the pid of journal thread in |
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current pid-namespace or 0 if task is unreachable.
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