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| author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2015-04-16 12:46:42 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-17 09:04:04 -0400 |
| commit | 53a2c3bdf4132c2c9cc3581e15265fd962f34fa8 (patch) | |
| tree | ef5c9ff41dd9adbc5dd1fcf6895159b9e559429c /fs/fcntl.c | |
| parent | fa33915c92b43f5a4e95649f81303cc089b10dc6 (diff) | |
| download | blackbird-op-linux-53a2c3bdf4132c2c9cc3581e15265fd962f34fa8.tar.gz blackbird-op-linux-53a2c3bdf4132c2c9cc3581e15265fd962f34fa8.zip | |
nilfs2: improve execution time of NILFS_IOCTL_GET_CPINFO ioctl
The older a filesystem gets, the slower lscp command becomes. This is
because nilfs_cpfile_do_get_cpinfo() function meets more hole blocks
as the start offset of valid checkpoint numbers gets bigger.
This reduces the overhead by skipping hole blocks efficiently with
nilfs_mdt_find_block() helper.
A measurement result of this patch is as follows:
Before:
$ time lscp
CNO DATE TIME MODE FLG BLKCNT ICNT
5769303 2015-02-22 19:31:33 cp - 108 1
5769304 2015-02-22 19:38:54 cp - 108 1
real 0m0.182s
user 0m0.003s
sys 0m0.180s
After:
$ time lscp
CNO DATE TIME MODE FLG BLKCNT ICNT
5769303 2015-02-22 19:31:33 cp - 108 1
5769304 2015-02-22 19:38:54 cp - 108 1
real 0m0.003s
user 0m0.001s
sys 0m0.002s
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fcntl.c')
0 files changed, 0 insertions, 0 deletions
