linux-kernel - Re: [PATCH] kbuild: collect shorthands into scripts/Kbuild.include

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Date:	Wed, 26 Nov 2014 14:55:08 +0100
From:	Michal Marek <mmarek@...e.cz>
To:	Masahiro Yamada <yamada.m@...panasonic.com>
Cc:	linux-kbuild@...r.kernel.org, Sam Ravnborg <sam@...nborg.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] kbuild: collect shorthands into scripts/Kbuild.include

On Wed, Nov 26, 2014 at 07:31:13PM +0900, Masahiro Yamada wrote:
> The shorthand "clean" is defined in both the top Makefile and
> scripts/Makefile.clean.  Likewise, the "hdr-inst" is defined in
> both the top Makefile and scripts/Makefile.headersinst.
> 
> To reduce code duplication, this commit collects them into
> scripts/Kbuild.include like the "build" and "modbuiltin" shorthands.
> It requires scripts/Makefile.clean to include scripts/Kbuild.include,
> but its impact on the performance of "make clean" should be
> negligible.
> 
> Signed-off-by: Masahiro Yamada <yamada.m@...panasonic.com>
> ---
> 
> Marek, please decide if this patch should be applied or not.
> 
> I am not so sure if 10% of performance regression is acceptable.
> I do not mind at all if this patch is rejected.
> 
> Before this commit, on my box,
> 
> $ time make clean
> 
> real	0m2.916s
> user	0m1.040s
> sys	0m2.005s
> 
> After,
> 
> real	0m3.221s
> user	0m1.109s
> sys	0m2.271s

0.3s is even less than my guess. And as I said, you can run make clean
in parallel, so I'm not thrilled. Applied to kbuild.git#kbuild.

Thanks,
Michal
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