linux-kernel - Re: [build-check] scripts: add check

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Date:   Tue, 3 Jul 2018 15:49:14 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Norbert Manthey <nmanthey@...zon.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        David Woodhouse <dwmw@...zon.co.uk>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [build-check] scripts: add check_build script

On Tue, 3 Jul 2018 15:12:10 +0200 Norbert Manthey <nmanthey@...zon.de> wrote:

> This script performs build testing, by building several configurations
> several times. The script is introduced to improve the consistency of
> testing changes in the kernel configuration.
> 
> This version build randconfig 10 times, as well as allyesconfig,
> allnoconfig and allmodconfig. Depending on the used machine and system
> setup, the script might take a while to finish.
> 
> The script logs all the used config files, as well as the output of the
> build commands to a log directory "build_check_logs", so that this data
> can be retrieved after running the script.

I'm unable to even guess how many people will find this useful.

> +build ()
> +{
> +	local -r LOG_FILE="$1"
> +	local -i STATUS=0
> +
> +	make clean -j $(nproc) &> /dev/null
> +	make -j $(nproc) &>> "$LOG_FILE" || STATUS=$?
> +
> +	echo "build status: $STATUS" >> "$LOG_FILE"
> +	echo "[$SECONDS] build status: $STATUS"
> +	return "$STATUS"
> +}

The script never sets nproc.  So I guess this is a bare `make -j'. 
When I type that on my (quite beefy) workstation I get eleventy xillion
processes and the machine locks up.  Can't even wiggle the mouse. 
After a 20 minute nap (thanks!) it was still comatose so I hit the big
button (who writes this junk??).

So you might want to take an educated guess from /proc/cpuinfo here.