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kernel: avoid copying unnecessary files during do_install

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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]

(From OE-Core rev: c753f9d59f4d0a5af4ea5deb6e2b9609e05314e2)

Signed-off-by: Mark Asselstine <mark.asselstine@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Mark Asselstine 2013-01-31 13:31:03 -05:00 committed by Richard Purdie
parent 4a4049b2fb
commit dbfa6f9563
1 changed files with 5 additions and 2 deletions
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7
meta/classes/kernel.bbclass
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@ -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}