forked from luck/tmp_suning_uos_patched
648eee52cc
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> |
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| .. | ||
| boot | ||
| configs | ||
| include/asm | ||
| kernel | ||
| lib | ||
| mach-bf518 | ||
| mach-bf527 | ||
| mach-bf533 | ||
| mach-bf537 | ||
| mach-bf538 | ||
| mach-bf548 | ||
| mach-bf561 | ||
| mach-common | ||
| mm | ||
| oprofile | ||
| ADI_BSD.txt | ||
| Kconfig | ||
| Kconfig.debug | ||
| Makefile | ||