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| author | OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> | 2008-01-09 00:32:41 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-01-09 01:10:35 +0100 |
| commit | 9f966be8996f2829406324c68e4c67c2d64d864b (patch) | |
| tree | 40b2e1f12834498f1e7d8240fe7f6f3dbaf0dce2 /include/asm-cris/timex.h | |
| parent | spi_bitbang: always grab lock with irqs blocked (diff) | |
| download | linux-9f966be8996f2829406324c68e4c67c2d64d864b.tar.xz linux-9f966be8996f2829406324c68e4c67c2d64d864b.zip | |
fat: optimize fat_count_free_clusters()
On large partition, scanning the free clusters is very slow if users
doesn't use "usefree" option.
For optimizing it, this patch uses sb_breadahead() to read of FAT
sectors. On some user's 15GB partition, this patch improved it very
much (1min => 600ms).
The following is the result of 2GB partition on my machine.
without patch:
root@devron (/)# time df -h > /dev/null
real 0m1.202s
user 0m0.000s
sys 0m0.440s
with patch:
root@devron (/)# time df -h > /dev/null
real 0m0.378s
user 0m0.012s
sys 0m0.168s
Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-cris/timex.h')
0 files changed, 0 insertions, 0 deletions