linux-kernel - Re: [PATCH 0/7] minmax: reduce compilation time

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Message-ID: <CAHk-=whsMPLro6RDY7GrjvXpy+WYPOL-AW5jrzwZ8P4GPBHxag@mail.gmail.com>
Date: Fri, 26 Jul 2024 11:24:09 -0700
From: Linus Torvalds <torvalds@...uxfoundation.org>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: David Laight <David.Laight@...lab.com>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, 
	"Matthew Wilcox (Oracle)" <willy@...radead.org>, Christoph Hellwig <hch@...radead.org>, 
	Andrew Morton <akpm@...ux-foundation.org>, 
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>, 
	Dan Carpenter <dan.carpenter@...aro.org>, Arnd Bergmann <arnd@...nel.org>, 
	"Jason@...c4.com" <Jason@...c4.com>, "pedro.falcato@...il.com" <pedro.falcato@...il.com>, 
	Mateusz Guzik <mjguzik@...il.com>, "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 0/7] minmax: reduce compilation time

On Fri, 26 Jul 2024 at 11:13, Lorenzo Stoakes
<lorenzo.stoakes@...cle.com> wrote:
>
> 5,447,539       ./arch/x86/xen/setup.o.pre

Can you perhaps do some kind of "max expansion" on all the
preprocessor files (you seem to have done it by changing the ".c.o"
rule to just spit it out as "o.pre", which sounds fine).

For example, this trivial patch seems to fix the setup.c expansion by
about an order of magnitude (ie 50M -> 5M).

Entirely untested, but looks ObviouslyCorrect(tm) to me.

                     Linus

                Linus

View attachment "patch.diff" of type "text/x-patch" (942 bytes)