[OE-core] [PATCH 7/9] linux-yocto: aufs and systemtap

[Burton, Ross]

On 6 March 2018 at 18:11, Bruce Ashfield <bruce.ashfield at windriver.com>
wrote:

> Integrating a configuration change for systemtap:
>
>   features/systemtap/systemtap.cfg: enable CONFIG_KERNEL_DEBUG
>

I noticed that all the performance machines had a big spike in kernel build
time and build directory size, and annoyingly spent too long bisecting
builds before noticing this in the commit message for the offending
commit.  If I re-read the logs I might have spotted this sooner. :)

$ buildstats-diff 20180314122002-3a8cce8b5c2 20180314122610-a7c9bc7020a/
Ignoring tasks less than 00:03.0 (3.0s)
Ignoring differences less than 00:01.0 (1.0s)

  PKG            TASK                      ABSDIFF   RELDIFF  CPUTIME1 ->
CPUTIME2
  linux-yocto    do_package                  20.2s   +153.0%     13.2s ->
33.3s
  linux-yocto    do_deploy                   29.9s  +1502.8%      2.0s ->
31.9s
  linux-yocto    do_package_write_ipk       125.5s   +310.2%     40.5s ->
166.0s
  linux-yocto    do_compile_kernelmodules   142.6s    +17.8%    800.3s ->
942.9s
  linux-yocto    do_package_write_rpm       156.0s   +563.6%     27.7s ->
183.7s
  linux-yocto    do_compile                 174.8s    +18.7%    934.3s ->
1109.1s

Cumulative cputime:
  649.5s    +35.0%    30:56.0 (1856.0s) -> 41:45.5 (2505.5s)

$ buildhistory-diff | grep SIZE
packages/qemux86-poky-linux/linux-yocto/kernel-vmlinux: PKGSIZE changed
from 19587044 to 300944172 (+1436%)

Is this really what we want out of the box?  Can the kernel have the
debugging bits stripped out into a separate package so even if we have the
build time hit, we don't have the kernel size change?

Ross
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