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| author |   Yang Shi <yang.shi@linux.alibaba.com> | 2018-06-19 07:59:18 +0800 |
|---|---|---|
| committer |   Jonathan Corbet <corbet@lwn.net> | 2018-06-26 09:01:35 -0600 |
| commit | fc1ca3d5b4b9532fff76fa21f7d22efdf02d38b7 (patch) | |
| tree | b964cc39500e4f5b4279e28f8df03fdfefa27148 /Documentation/sysctl | |
| parent | Documentation: nommu-map: Fix duplicate word typo (diff) | |
| download | linux-dev-fc1ca3d5b4b9532fff76fa21f7d22efdf02d38b7.tar.xz linux-dev-fc1ca3d5b4b9532fff76fa21f7d22efdf02d38b7.zip | |
doc: add description to dirtytime_expire_seconds
commit 1efff914afac8a965ad63817ecf8861a927c2ace ("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>
Diffstat (limited to 'Documentation/sysctl')
| -rw-r--r-- | Documentation/sysctl/vm.txt | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt index 697ef8c225df..960e82759ffb 100644 --- a/Documentation/sysctl/vm.txt +++ b/Documentation/sysctl/vm.txt @@ -27,6 +27,7 @@ Currently, these files are in /proc/sys/vm: - 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 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 The kernel flusher threads will periodically wake up and write `old' data |