ext2: speed up file creates by optimizing rec_len functions

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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>

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Eric Sandeen 2010-12-07 11:51:05 -06:00 • committed by Jan Kara

parent 156e74312f

commit 40a063f669

1 changed files with 14 additions and 5 deletions

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fs/ext2/dir.c

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