From: Mark Asselstine <[email protected]> kernel_do_install() populates $kerneldir with files needed to build external modules. To accomplish this there are several copy commands to get source from the kernel source tree and build trees after which a 'clean' is performed. Since we are copying from the build tree we get about 1G of .o and .cmd files copied over only to have them removed when we clean. This adds additional IO overhead as well as overhead caused by pseudo. By avoiding copying these files in the first place we get multiple gains: * avoid initial copy * avoid file deletes during clean * reduce pseudo overhead
Additionally we are making use of cpio vs cp which tends to be significantly faster at performing copies. With these changes I observe a 15-30% decrease in the time to complete the do_install() operation on the kernel. [YOCTO #3517] Signed-off-by: Mark Asselstine <[email protected]> Signed-off-by: Bruce Ashfield <[email protected]> --- meta/classes/kernel.bbclass | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass index e2a582b..cc61be6 100644 --- a/meta/classes/kernel.bbclass +++ b/meta/classes/kernel.bbclass @@ -143,10 +143,13 @@ kernel_do_install() { # work and sysroots can be on different partitions, so we can't rely on # hardlinking, unfortunately. # - cp -fR * $kerneldir + find . -depth -not -name "*.cmd" -not -name "*.o" -not -path "./.*" -print0 | cpio --null -pdu $kerneldir cp .config $kerneldir if [ "${S}" != "${B}" ]; then - cp -fR ${S}/* $kerneldir + pwd="$PWD" + cd "${S}" + find . -depth -not -path "./.*" -print0 | cpio --null -pdu $kerneldir + cd "$pwd" fi install -m 0644 ${KERNEL_OUTPUT} $kerneldir/${KERNEL_IMAGETYPE} install -m 0644 System.map $kerneldir/System.map-${KERNEL_VERSION} -- 1.7.10.4 _______________________________________________ Openembedded-core mailing list [email protected] http://lists.linuxtogo.org/cgi-bin/mailman/listinfo/openembedded-core
