[Buildroot] [PATCH 2/2] core/instrumentation: shave minutes off the build time

[Thomas Petazzoni <thomas.petazzoni@bootlin.com>]

Hello,

On Mon, 19 Mar 2018 16:30:52 +0000, Trent Piepho wrote:

> After fixing s/L/l/, here are the timings for a 15 minute build:
> 
> configure                510.29
> build                    166.12
> extract                   45.53
> other                     43.88
> hostinstall               35.43
> check_host_rpath          33.37
> check_bin_arch            28.30
> targetinstall             23.37
> stageinstall              15.97
> step_pkg_size              9.49

Thanks for those measurements. I still find it a bit annoying that we
spend 1m10sec on instrumentation related topics on a 15 minutes build.
The use of ccache makes the build time lower than it normally is, and
therefore makes the instrumentation cost even more visible, but using
ccache is a valid use case.

Should we move the check_host_rpath and check_bin_arch checks as
finalize hooks, instead of running them at the end of each package
installation ? We can always get the package that installed the "bogus"
file through the package-file-list*.txt files, no ?

This would save 1 minute of build time on the above test.

Best regards,

Thomas
-- 
Thomas Petazzoni, CTO, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
http://bootlin.com