[OE-core] [PATCH 1/2] kernel: stop using -exec rm for deleting files
Richard Purdie
richard.purdie at linuxfoundation.org
Sun Feb 9 12:06:32 UTC 2014
On Tue, 2014-02-04 at 12:34 -0500, Bruce Ashfield wrote:
> Removing files from the source tree via find, exec and rm is not the
> most efficient operation, due to (among other things) the many forked
> processes.
>
> If we use -delete, it saves a significant amount of time. But -delete
> does not work with -prune (since it forces -depth). To maintain the
> lib, tools and scripts source files, we can hide them temporarily,
> skip their hidden directories and then finally restore them.
>
> Time for install before this change:
>
> real 2m48.563s
> user 0m35.220s
> sys 0m33.036s
>
> Time for install after this change:
>
> real 1m21.301s
> user 0m33.160s
> sys 0m28.388s
>
> We could further speed this up by using inline perl to delete the files,
> but that complexity is avoided for now.
>
> Signed-off-by: Bruce Ashfield <bruce.ashfield at windriver.com>
> ---
> meta/classes/kernel.bbclass | 18 +++++++++++++++---
> 1 file changed, 15 insertions(+), 3 deletions(-)
>
> diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
> index 51626b03f824..b76a65699755 100644
> --- a/meta/classes/kernel.bbclass
> +++ b/meta/classes/kernel.bbclass
> @@ -260,9 +260,21 @@ kernel_do_install() {
> # we clean the scripts dir while leaving the generated config
> # and include files.
> #
> - oe_runmake -C $kerneldir CC="${KERNEL_CC}" LD="${KERNEL_LD}" clean
> - make -C $kerneldir _mrproper_scripts
> - find $kerneldir -path $kerneldir/lib -prune -o -path $kerneldir/tools -prune -o -path $kerneldir/scripts -prune -o -name "*.[csS]" -exec rm '{}' \;
> + oe_runmake -C $kerneldir CC="${KERNEL_CC}" LD="${KERNEL_LD}" clean _mrproper_scripts
> +
> + # hide directories that shouldn't have their .c, s and S files deleted
> + for d in tools scripts lib; do
> + mv $kerneldir/$d $kerneldir/.$d
> + done
> +
> + # delete .c, .s and .S files, unless we hid a directory as .<dir>. This technique is
> + # much faster than find -prune and -exec
> + find . -not -path '*/\.*' -type f -name "*.[csS]" -delete
> +
> + # put the hidden dirs back
> + for d in tools scripts lib; do
> + mv $kerneldir/.$d $kerneldir/$d
> + done
>
> # As of Linux kernel version 3.0.1, the clean target removes
> # arch/powerpc/lib/crtsavres.o which is present in
I think this patch is resulting in:
http://autobuilder.yoctoproject.org/main/builders/nightly-fsl-ppc-lsb/builds/22/steps/BuildImages/logs/stdio
Cheers,
Richard
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