hi,
I try to find ways to reduce the start time of programs or the whole
operating system. The idea to increase disk performance is to gather all
related files on disk physically close together. Unlike the last patches
from Kazuya Mio for "relevant file defragmentation" files used by system
boot are mostly not in the same directory.
First i look at the EXT4_IOC_MOVE_EXT call.
To reduce the amount of disk seeks i want to move the extents from
several files into a single donor file. To do so i increment the
move_extent.donor_start by the size of each file. But i got an error.
The error is caused by the lines in the kernel source
fs/ext4/move_extent.c:998
998 /* Start offset should be same */
999 if (orig_start != donor_start) {
1000 ext4_debug("ext4 move extent: orig and donor's start "
1001 "offset are not same [ino:orig %lu, donor %lu]\n",
1002 orig_inode->i_ino, donor_inode->i_ino);
1003 return -EINVAL;
1004 }
Is there a reason why the offset of the original file and the donor file
must be the same?
As i can see the patch for relevant file defragmentation in e4defrag
supports only directories. May it be possible to select any desired file?
What would you suggest as the best way to put files physically together?
If I could help, tell me. :)
Regards,
andy
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