acrn-kernel/arch/blackfin/lib
Robin Getz 648eee52cc Blackfin: optimize strncpy a bit
Add a little strncpy optimization which can easily cut boot time by 20%.

When the kernel is booting with initramfs, it builds up the filesystem
from a cpio archive by calling strncpy_from_user() via fs/namei.c's
do_getname() on every file in the archive (which can be lots) with a
length of PATH_MAX (1024).  This causes the dest of the strncpy to be
padded with many NUL bytes.

This optimization mostly causes these NUL bytes to be padded with a call
to memset() which is already optimized for filling memory quickly, but
the hardware loop helps a little bit as well.

Boot time measured with 'loglevel=0' so UART speed doesn't get in the way.

Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
2010-05-22 14:19:11 -04:00
..
Makefile
ashldi3.c
ashrdi3.c
divsi3.S
gcclib.h
ins.S
lshrdi3.c
memchr.S
memcmp.S
memcpy.S
memmove.S
memset.S Blackfin: optimize strncpy a bit 2010-05-22 14:19:11 -04:00
modsi3.S
muldi3.S
outs.S
smulsi3_highpart.S
strcmp.S Blackfin: move string functions to normal lib/ assembly 2010-05-22 14:19:09 -04:00
strcpy.S Blackfin: move string functions to normal lib/ assembly 2010-05-22 14:19:09 -04:00
strncmp.S Blackfin: move string functions to normal lib/ assembly 2010-05-22 14:19:09 -04:00
strncpy.S Blackfin: optimize strncpy a bit 2010-05-22 14:19:11 -04:00
udivsi3.S
umodsi3.S
umulsi3_highpart.S