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| author | Karel Zak | 2015-03-30 12:43:45 +0200 |
|---|---|---|
| committer | Karel Zak | 2015-03-30 12:43:45 +0200 |
| commit | 8c7f073aaeaad3ab9b1775447306776056bf50b8 (patch) | |
| tree | 56b7a22576e8e45a7654122b034f2870574f8046 /sys-utils/mount.8 | |
| parent | setarch: fix regression for sparc builds (diff) | |
| download | kernel-qcow2-util-linux-8c7f073aaeaad3ab9b1775447306776056bf50b8.tar.gz kernel-qcow2-util-linux-8c7f073aaeaad3ab9b1775447306776056bf50b8.tar.xz kernel-qcow2-util-linux-8c7f073aaeaad3ab9b1775447306776056bf50b8.zip | |
libmount: add support for MS_LAZYTIME
Signed-off-by: Karel Zak <kzak@redhat.com>
Diffstat (limited to 'sys-utils/mount.8')
| -rw-r--r-- | sys-utils/mount.8 | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/sys-utils/mount.8 b/sys-utils/mount.8 index fac4b0c9b..aaf6b39fd 100644 --- a/sys-utils/mount.8 +++ b/sys-utils/mount.8 @@ -1043,6 +1043,33 @@ system mount options see /proc/mounts. .B nostrictatime Use the kernel's default behavior for inode access time updates. .TP +.B lazytime +Only update times (atime, mtime, ctime) on the in-memory version of the file inode. + +This mount option significantly reduces writes to the inode table for +workloads that perform frequent random writes to preallocated files. +As at Linux 3.20, this option is supported only on ext4. + +The on-disk timestamps are updated only when: +.sp +.RS +- the inode needs to be updated for some change unrelated to file timestamps +.sp +- the application employs +.BR fsync (2), +.BR syncfs (2), +or +.BR sync (2) +.sp +- an undeleted inode is evicted from memory +.sp +- more than 24 hours have passed since the i-node was written to disk. +.RE +.sp +.TP +.B nolazytime +Do not use the nolazytime feature. +.TP .B suid Allow set-user-identifier or set-group-identifier bits to take effect. |