[U-Boot] [PATCH] Reduce build times
Graeme Russ
graeme.russ at gmail.com
Wed Nov 2 12:08:15 CET 2011
Hi Wolfgang,
On 02/11/11 17:54, Wolfgang Denk wrote:
> U-Boot Makefiles contain a number of tests for compiler features etc.
> which so far are executed again and again. On some architectures
> (especially ARM) this results in a large number of calls to gcc.
>
> This patch makes sure to run such tests only once, thus largely
> reducing the number of "execve" system calls.
>
> Example: number of "execve" system calls for building the "P2020DS"
> (Power Architecture) and "qong" (ARM) boards, measured as:
> -> strace -f -e trace=execve -o /tmp/foo ./MAKEALL <board>
> -> grep execve /tmp/foo | wc -l
>
> Before: After: Reduction:
> ==================================
> P2020DS 20555 15205 -26%
> qong 31692 14490 -54%
>
> As a result, built times are significantly reduced, typically by
> 30...50%.
>
> Signed-off-by: Wolfgang Denk <wd at denx.de>
> Cc: Andy Fleming <afleming at gmail.com>
> Cc: Kumar Gala <galak at kernel.crashing.org>
> Cc: Albert Aribaud <albert.aribaud at free.fr>
> cc: Graeme Russ <graeme.russ at gmail.com>
> cc: Mike Frysinger <vapier at gentoo.org>
> ---
Tested on x86, does what is written on the box ;)
Tested-by: Graeme Russ <graeme.russ at gmail.com>
Regards,
Graeme
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