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doc: add description to dirtytime_expire_seconds

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commit 1efff914af ("fs: add
dirtytime_expire_seconds sysctl") introduced dirtytime_expire_seconds
knob, but there is not description about it in
Documentation/sysctl/vm.txt.

Add the description for it.

Cc: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Yang Shi <yang.shi@linux.alibaba.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Yang Shi
2018-06-19 07:59:18 +08:00
committed by Jonathan Corbet
parent 83d4fcb3a0
commit fc1ca3d5b4
1 changed files with 13 additions and 0 deletions
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13
Documentation/sysctl/vm.txt
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@@ -27,6 +27,7 @@ Currently, these files are in /proc/sys/vm:
- dirty_bytes - dirty_bytes
- dirty_expire_centisecs - dirty_expire_centisecs
- dirty_ratio - dirty_ratio
- dirtytime_expire_seconds
- dirty_writeback_centisecs - dirty_writeback_centisecs
- drop_caches - drop_caches
- extfrag_threshold - extfrag_threshold
@@ -178,6 +179,18 @@ The total available memory is not equal to total system memory.
============================================================== ==============================================================
dirtytime_expire_seconds
When a lazytime inode is constantly having its pages dirtied, the inode with
an updated timestamp will never get chance to be written out. And, if the
only thing that has happened on the file system is a dirtytime inode caused
by an atime update, a worker will be scheduled to make sure that inode
eventually gets pushed out to disk. This tunable is used to define when dirty
inode is old enough to be eligible for writeback by the kernel flusher threads.
And, it is also used as the interval to wakeup dirtytime_writeback thread.
==============================================================
dirty_writeback_centisecs dirty_writeback_centisecs
The kernel flusher threads will periodically wake up and write `old' data The kernel flusher threads will periodically wake up and write `old' data