tree 2726e4d6b5716edb3a1124a3c7a4ba1348d84b69
parent 156e74312f1ffc0a2639c24c771c5a0e106f0505
author Eric Sandeen <sandeen@redhat.com> 1291744265 -0600
committer Jan Kara <jack@suse.cz> 1294682646 +0100

ext2: speed up file creates by optimizing rec_len functions

The addition of 64k block capability in the rec_len_from_disk
and rec_len_to_disk functions added a bit of math overhead which
slows down file create workloads needlessly when the architecture
cannot even support 64k blocks, thanks to page size limits.

The directory entry checking can also be optimized a bit
by sprinkling in some unlikely() conditions to move the
error handling out of line.

bonnie++ sequential file creates on a 512MB ramdisk speeds up
from about 2200/s to about 2500/s, about a 14% improvement.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>