The patch titled
Subject: Documentation/sysctl/vm.txt: add description to dirtytime_expire_seconds
has been added to the -mm tree. Its filename is
doc-add-description-to-dirtytime_expire_seconds.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/doc-add-description-to-dirtytime_expire_seconds.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/doc-add-description-to-dirtytime_expire_seconds.patch
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------------------------------------------------------
From: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Subject: Documentation/sysctl/vm.txt: add description to dirtytime_expire_seconds
1efff914afac8 ("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.
Link: http://lkml.kernel.org/r/1529366358-67312-1-git-send-email-yang.shi@xxxxxxxxxxxxxxxxx
Signed-off-by: Yang Shi <yang.shi@xxxxxxxxxxxxxxxxx>
Cc: Theodore Ts'o <tytso@xxxxxxx>
Cc: Nikolay Borisov <nborisov@xxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/sysctl/vm.txt | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff -puN Documentation/sysctl/vm.txt~doc-add-description-to-dirtytime_expire_seconds Documentation/sysctl/vm.txt
--- a/Documentation/sysctl/vm.txt~doc-add-description-to-dirtytime_expire_seconds
+++ a/Documentation/sysctl/vm.txt
@@ -27,6 +27,7 @@ Currently, these files are in /proc/sys/
- dirty_bytes
- dirty_expire_centisecs
- dirty_ratio
+- dirtytime_expire_seconds
- dirty_writeback_centisecs
- drop_caches
- extfrag_threshold
@@ -178,6 +179,18 @@ The total available memory is not equal
==============================================================
+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
The kernel flusher threads will periodically wake up and write `old' data
_
Patches currently in -mm which might be from yang.shi@xxxxxxxxxxxxxxxxx are
doc-add-description-to-dirtytime_expire_seconds.patch
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