Messages in this thread Patch in this message | | | From | Yang Shi <> | Subject | [PATCH] doc: add description to dirtytime_expire_seconds | Date | Thu, 31 May 2018 07:56:53 +0800 |
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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> --- I didn't dig into the old review discussion about why the description was not added at the first place. I'm supposed every knob under /proc/sys should have a brief description.
Documentation/sysctl/vm.txt | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt index 17256f2..f4f4f9c 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 +179,16 @@ The total available memory is not equal to total system memory. ============================================================== +dirtytime_expire_seconds + +When a lazytime inode is constantly having its pages dirtied, it with an +updated timestamp will never get chance to be written out. 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. It is expressed in seconds. + +============================================================== + dirty_writeback_centisecs The kernel flusher threads will periodically wake up and write `old' data -- 1.8.3.1
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