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 series introduces some helper functions which help to skip hole
blocks efficiently, and reduces the overhead with them.
A measurement result of this series 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
Thanks,
Ryusuke Konishi
--
Ryusuke Konishi (4):
nilfs2: unify type of key arguments in bmap interface
nilfs2: add bmap function to seek a valid key
nilfs2: add helper to find existent block on metadata file
nilfs2: improve execution time of NILFS_IOCTL_GET_CPINFO ioctl
fs/nilfs2/alloc.c | 5 +++--
fs/nilfs2/bmap.c | 48 ++++++++++++++++++++++++++++++---------
fs/nilfs2/bmap.h | 13 ++++++-----
fs/nilfs2/btree.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/nilfs2/cpfile.c | 58 ++++++++++++++++++++++++++++++++++++++++++-----
fs/nilfs2/direct.c | 17 ++++++++++++++
fs/nilfs2/inode.c | 6 ++---
fs/nilfs2/mdt.c | 54 ++++++++++++++++++++++++++++++++++++++++++++
fs/nilfs2/mdt.h | 3 +++
9 files changed, 243 insertions(+), 27 deletions(-)
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